(North American) P-51 Mustang @·AIRCRAFTUBE

  • North-American<br>P-51A Mustang North-American<br>P-51A Mustang
    North-American
    P-51A Mustang
  • North-American XP-51 (SN 41-039) North-American XP-51 (SN 41-039)
    North-American XP-51 (SN 41-039)
  • The A-36 Apache, a Fighter-Bomber P-51A The A-36 Apache, a Fighter-Bomber P-51A
    The A-36 Apache, a Fighter-Bomber P-51A
  • P-51B P-51B
    P-51B
  • P-51C Dual control P-51C Dual control
    P-51C Dual control
  • North-American P-51C Mustang "Red Tail Reborn" North-American P-51C Mustang "Red Tail Reborn"
    North-American P-51C Mustang "Red Tail Reborn"
  • North American P-51H North American P-51H
    North American P-51H
  • P-51D P-51D
    P-51D
  • A RAF P-51 A RAF P-51
    A RAF P-51
  • North American F-51H-5-NA Mustang of 197th Fighter Squadron North American F-51H-5-NA Mustang of 197th Fighter Squadron
    North American F-51H-5-NA Mustang of 197th Fighter Squadron
  • P-51D P-51D
    P-51D
  • F-6 Mustang<br>(160 TRS) F-6 Mustang<br>(160 TRS)
    F-6 Mustang
    (160 TRS)
  • P-51D of 505 Squadron P-51D of 505 Squadron
    P-51D of 505 Squadron
  • Inglewood<br>factory<br>(A P-51D) Inglewood<br>factory<br>(A P-51D)
    Inglewood
    factory
    (A P-51D)
  • P-51D Mustang<br>Canterbury Squadron P-51D Mustang<br>Canterbury Squadron
    P-51D Mustang
    Canterbury Squadron
  • P-51H P-51H
    P-51H
  • North American F-51D<br>(Korea, September 1951) North American F-51D<br>(Korea, September 1951)
    North American F-51D
    (Korea, September 1951)
  • XP-82 Twin-Mustang XP-82 Twin-Mustang
    XP-82 Twin-Mustang
  • P-51D P-51D
    P-51D
  • The Cavalier Mustang The Cavalier Mustang
    The Cavalier Mustang
  • The P-51D-30NT "Luscious Lisa" The P-51D-30NT "Luscious Lisa"
    The P-51D-30NT "Luscious Lisa"
  • North American P-51A North American P-51A
    North American P-51A
  • The P-51D-30 NA "Glamorous Gal" The P-51D-30 NA "Glamorous Gal"
    The P-51D-30 NA "Glamorous Gal"
  • The P-51D airracer "Dago Red" The P-51D airracer "Dago Red"
    The P-51D airracer "Dago Red"
  • North American P-51D Mustang North American P-51D Mustang
    North American P-51D Mustang
  • A RF-51 Mustang of the 45th Tactical Reconnaissance Squadron (Korea, 1950) A RF-51 Mustang of the 45th Tactical Reconnaissance Squadron (Korea, 1950)
    A RF-51 Mustang of the 45th Tactical Reconnaissance Squadron (Korea, 1950)

North American P-51 Mustang

The design of the Mustang started in 1940 when the British asked North American's president, James H 'Dutch' Kindelberger to build a fighter for the RAF. The NA-73 prototype made it's first flight in October 1940, only 4 month after the first drawing was made! The first production aircraft was delivered to the RAF in November 1941, powered by a 1,150 hp Allison V-1710-F3R engine and made it's first operational sortie in July 1942. Because of poor high altitude performance, the aircraft was later used for low level reconnaissance. Two early planes had been delivered to the US Army for evaluation, under designation XP-51. It's after America's entrance into the war that the US Air Force got it's first P-51 delivered. P-51B and later versions received the 1,520 hp Rolls Royce Merlin V-1650 engine from 1943. They were mainly used as daylight long range escort fighters from January 1944, equipped with drop tanks for this purpose. After World War II and the Korean conflict, many Mustangs were converted for civilian use, especially air racing. The Mustang's reputation was such that, in the mid-1960s, Ford Motor Company's Designer John Najjar proposed the name for a new youth-oriented coupe after the fighter.

Genesis

In 1939, shortly after World War II began, the British government established a purchasing commission in the United States, headed by Sir Henry Self. Along with Sir Wilfrid Freeman, who, as the "Air Member for Development and Production", was given overall responsibility for Royal Air Force (RAF) production and research and development in 1938, Self had sat on the (British) Air Council Sub-committee on Supply (or "Supply Committee"), and one of Self's many tasks was to organize the manufacture of American fighter aircraft for the RAF. At the time the choice was very limited : none of the U.S. aircraft already flying met European standards; only the Curtiss Tomahawk came close. The Curtiss plant was running at capacity, so even that aircraft was in short supply.

North American Aviation (NAA) was already supplying their Harvard trainer to the RAF, but were otherwise underutilized. NAA President "Dutch" Kindelberger approached Self to sell a new medium bomber, the B-25 Mitchell. Instead, Self asked if NAA could manufacture the Tomahawk under license from Curtiss.

Kindelberger replied that NAA could have a better aircraft with the same engine in the air in less time than it would take to set up a production line for the P-40. By now the executive head of the British Ministry of Aircraft Production (MAP), Freeman ordered 320 aircraft in March 1940. On 26 June 1940, MAP awarded a contract to Packard to build modified versions of the Rolls-Royce Merlin engines under licence; in September, MAP increased the first production order by 300.

Design and development

The result of the MAP order was the NA-73X project (from March 1940). The design followed the best conventional practice of the era, but included two new features. One was a new NACA-designed laminar flow wing, which was associated with very low drag at high speeds. Another was the use of a new radiator design (one Curtiss had been unable to make work) that used the heated air exiting the radiator as a form of jet thrust in what is referred to as the "Meredith Effect". Because North American lacked a suitable wind tunnel, it used the GALCIT 10-foot wind tunnel at Cal Tech. This led to some controversy over whether the Mustang's cooling system aerodynamics were developed by North American's engineer Edgar Schmued or by Curtiss, although historians and researchers dismiss the allegation of stolen technology; such claims are likely moot in any event, as North American had purchased Curtiss' complete set of P-40 and XP-46 wind tunnel data and flight test reports for US$56,000.

While the United States Army Air Corps could block any sales it considered detrimental or not in the interest of the United States, the NA-73 represented a special case. In order to ensure deliveries were uninterrupted, an arrangement was eventually reached where the RAF would get its aircraft in exchange for NAA providing two free examples to the USAAC for evaluation.

The prototype NA-73X was rolled out just 117 days after the order was placed, and first flew on 26 October 1940, just 178 days after the order had been placed - an incredibly short gestation period. In general the prototype handled well and the internal arrangement allowed for an impressive fuel load. It was armed with four .30 caliber Browning (or 7.62 mm) and two .50 M2 Browning (or 12.7 mm) machineguns in the wings and two .50 M2s in the chin.

Allison-engined Mustangs

Mustang I/P-51/P-51A

It was quickly evident that performance, although exceptional up to 15,000 feet, was markedly reduced at higher altitudes. This deficiency was due largely to the single speed, single stage supercharger of the Allison V-1710 engine, where power diminished rapidly above the critical altitude rating. Prior to the Mustang project, the USAAC had Allison concentrate primarily on turbochargers in concert with General Electric; these proved to be exceptional in the P-38 Lightning and other high-altitude aircraft, in particular, the Air Corp's four-engine bombers. Most of the other uses for the Allison were for low-altitude designs, where a simpler supercharger would suffice. The turbocharger proved impractical in the Mustang, and it was forced to use the inadequate supercharger available. Still, the Mustang's advanced aerodynamics showed to advantage, as the Mustang I was about 30 mph faster than contemporary Curtiss P-40 fighters, using the same powerplant (the V-1710-39 producing 1,220 HP at 10,500 ft, driving a 10 foot 6 inch diameter, three-blade Curtiss-Electric propeller). The Mustang I was 30 mph faster than the Spitfire Mk.VC at 5,000 ft and 35 mph faster at 15,000 ft, despite the British aircraft's more powerful engine.

The first production contract was awarded by the British for 320 NA-73 fighters, named Mustang I by the British (the name being selected by an anonymous member of the Purchasing Commission). Two aircraft of this lot delivered to the USAAC for evaluation were designated XP-51. About 20 Mustang Is were delivered to the RAF, making their combat debut on 10 May 1942. With their long range and excellent low-level performance, they were employed effectively for tactical reconnaissance and ground-attack duties over the English Channel, but were thought to be of limited value as fighters due to their poor performance above 15,000 ft.

A second British contract called for 300 more (NA-83) Mustang I fighters. In September 1940, 150 aircraft, designated NA-91 by North American, were ordered under the Lend/Lease program. These were designated by the USAAF as P-51 and initially named Apache, although this was soon dropped and the RAF name, Mustang, adopted instead. The British designated this model as Mustang IA. The Mustang Mk.IA was identical to the Mustang Mk.I except that the wing-mounted machine guns were removed and replaced with four long-barrelled 20 mm Hispano Mk.II cannon.

A number of aircraft from this lot were fitted out by the USAAF as F-6A photo-reconnaissance aircraft. The British would fit a number of Mustang Is with similar equipment. Also, two aircraft of this lot were fitted with Packard-built Merlin engines. These were identified as the Model NA-101 by North American and XP-78 by the USAAF, later redesignated XP-51B.

On 23 June 1942 a contract was placed for 1,200 P-51A (or NA-99), later reduced to 310 aircraft. The P-51A was the first version to be procured as a fighter by the USAAF, and used a new Allison V-1710-81 engine, a development of the -39, driving a 10 foot 9 inch diameter, three bladed Curtiss-Electric propeller. The armament was changed to four wing mounted .50 calibre Browning machine guns, two in each wing, with a maximum of 350 rpg for the inboard guns and 280 rpg for the outboard. Other improvements were made in parallel with the A-36, including an improved, fixed air duct inlet replacing the moveable fitting of previous Mustang models and the fitting of wing racks able to carry either 75 gallon or 150 gallon drop tanks, increasing the maximum ferry range to 2,740 statute miles with the 150 gallon tanks. The top speed was raised to 409 mph at 10,000 feet. Fifty aircraft were shipped to England, serving as Mustang II in the RAF.

A-36 Apache/Invader

At the same time, the USAAC was becoming more interested in ground attack aircraft and had a new version ordered as the A-36 Apache, which included six .50 M2 Browning machine guns, dive brakes and the ability to carry two 500 lb (or 230 kg) bombs.

In early 1942, the USAAF ordered 500 aircraft modified as dive bombers that were designated A-36A (or NA-97). This model became the first USAAF Mustang to see combat. One aircraft was passed to the British who gave it the name Mustang I (Dive Bomber).

Merlin-engined Mustangs

P-51B and P-51C

In April 1942, the RAF's Air Fighting Development Unit, (AFDU) tested the Mustang and found its performance inadequate at higher altitudes. As such it was to be used to replace the Tomahawk in Army Cooperation Command squadrons but the commanding officer was so impressed with its manoeuvrability and low-altitude speeds that he invited Ronnie Harker from Rolls Royce's Flight Test establishment to fly it. Rolls-Royce engineers rapidly realized that equipping the Mustang with a Merlin 61 engine with its two speed, two stage supercharger would substantially improve performance and started converting five aircraft as the Mustang X. Apart from the engine installation, which utilised custom built engine bearers designed by Rolls-Royce and a standard 10 ft 9 in diameter, four bladed Rotol propeller from a Spitfire Mk.IX, the Mustang X was a straight-forward adaptation of the Mustang I airframe, keeping the same radiator duct design. The Vice-Chief of the Air Staff, Air Marshal Sir Wilfrid R. Freeman, lobbied vociferously for Merlin-powered Mustangs, insisting two of the five experimental Mustang X be handed over to Carl Spaatz for trials and evaluation by the U.S. 8th Air Force in Britain.

The high-altitude performance improvement was astonishing : the Mustang X (AM208) reached 433 mph (or 697 km/h) at 22,000 ft and AL975 tested at an absolute ceiling of 40,600 ft.

The XP-51B prototypes were a more thorough adaptation of the airframe, with a tailor made engine installation and a complete redesign of the radiator duct. The airframe itself was strengthened, with the fuselage and engine mount area receiving more formers because of the greater weight of the Packard Merlin V-1650-3, 1,690 lbs compared with the Allison V-1710's 1,335 lbs. The engine cowling was completely redesigned to house the Packard Merlin which, because of the intercooler radiator mounted on the supercharger casing, was 5 inches taller and used an updraught induction system rather than the downdraught carburetor of the Allison. The new engine drove a four bladed 11 ft 2 in diameter Hamilton Standard propeller which featured cuffs of hard molded rubber. A new radiator, supercharger intercooler and oil radiator installation in a new fuselage duct was designed to cater for the increased cooling requirements of the Merlin.

It was decided that the armament of the new, P-51B, (NA 102) would be the four .50 Cal Browning M2/AN machine guns (with 350 rpg for the inboard guns and 280 rpg for the outboard) of the P-51A and the bomb rack/external drop tank installation (adapted from the A-36) would also be used; the racks were rated to be able to carry up to 500 lbs of ordnance and were also capable of carrying drop tanks. The weapons were aimed using an N-3B optical gunsight fitted with an A-1 head assembly which allowed it to be used as a gun or bomb sight through varying the angle of the reflector glass. Pilots were also given the option of having ring and bead sights mounted on the top engine cowling formers. This option was discontinued with the later Ds.

The first XP-51Bs started test flying in December 1942. After sustained lobbying at the highest level, American production was started in early 1943 with the B (NA-102) being manufactured at Inglewood, California, and the C (NA-103) at a new plant in Dallas, Texas, which was in operation by summer 1943. The RAF named these models Mustang III. In performance tests, the P-51B reached 441 mph or 710 km/h (exactly two-thirds supersonic speed at altitude) at 25,000 ft (or 7.600 m) and the subsequent extended range made possible by the use of drop tanks enabled the Merlin-powered Mustang to be introduced as a bomber escort.

The range would be further increased with the introduction of an 85 gallon self-sealing fuel tank aft of the pilot's seat, starting with the B-5NA series. When this tank was full the c-g of the Mustang was moved dangerously close to the aft limit, as a result of which maneuvers were restricted until the tank was down to about 25 gallons and the external tanks had been dropped. Problems with high-speed "porpoising" of the P-51Bs and Cs with the fuselage tanks would lead to the replacement of the fabric covered elevators with metal covered surfaces and a reduction of the tailplane incidence.

Despite these modifications the P-51B and C and the newer D and K experienced low speed handling problems that could result in an involuntary "snap-roll" under certain conditions of air speed, angle of attack, gross weight and center of gravity. Several crash reports tell of P-51B and C crashing because horizontal stabilizers were torn off during maneuvering. As a result of these problems a modification kit consisting of a dorsal fin was manufactured. One report stated : "Unless a dorsal fin is installed on the P-51B, P-51C and P-51D airplanes, a snap roll may result when attempting a slow roll. The horizontal stabilizer will not withstand the effects of a snap roll. To prevent recurrence the stabilizer should be reinforced in accordance with T.O. 01-60J-18 dated 8 April 1944 and a dorsal fin should be installed. Dorsal fin kits are being made available to overseas activities".

These kits became available in August 1944 and were fitted to B and C and to D and K. Also incorporated was a change to the rudder trim tabs, which would help prevent the pilot over-controlling the aircraft and creating heavy loads on the tail unit.

P-51B and C started to arrive in England in August and October 1943. Those versions were sent to 15 fighter groups that were part of the 8th and 9th Air Forces in England, and the 12th and 15th in Italy (the southern part of Italy was under Allied control by late 1943). Other deployments included the China Burma India Theater (or CBI).

Allied strategists quickly exploited the long-range fighter as a bomber escort. It was largely due to the P-51 that daylight bombing raids deep into German territory became possible without prohibitive bomber losses in late 1943.

A number of the P-51B and P-51C aircraft were fitted for photo reconnaissance and designated F-6C.

P-51D and P-51K

One of the few remaining complaints with the Merlin-powered aircraft was a poor rearward view. This was a common problem in most fighter designs of the era, which had only been recognized by the British after the Battle of Britain proved the value of an all-around view. In order to improve the view from the Mustang at least partially, the British had field-modified some Mustangs with fishbowl-shaped sliding canopies called "Malcolm Hoods." Eventually all Mk.IIIs, along with some American P-51B and C, were equipped with Malcolm Hoods.

A better solution to the problem was the "teardrop" or "bubble" canopy. Originally developed as part of the Miles M.20 project, these newer canopies were in the process of being adapted to most British designs, eventually appearing on late-model Spitfires, Typhoons and Tempests. North American adapted several NA-106 prototypes with a bubble canopy, cutting away the decking behind the cockpit, resulting in substantially improved vision to the rear. This led to the production P-51D, considered the definitive Mustang.

A common misconception is that the cutting down of the rear fuselage to mount the bubble canopy reduced stability requiring the addition of a dorsal fin to the forward base of the vertical tail. In fact, as described, stability problems affected the earlier Bs and Cs, as well as the subsequent D and K models; this was partly attributable to the 85 gallon fuselage fuel tank which had been installed during production of the P-51B-5-NA.

Among other modifications, armament was increased with the addition of two M2 machine guns, bringing the total to six. The inner pair of machine guns had 400 rounds each, and the others had 270 rounds, for a total of 1,880. In previous P-51, the M2 were mounted at an extreme side angle to allow access to the feed chutes from the ammunition trays. This angled mounting had caused problems of congestion and jamming of the ammunition and spent casings and links, leading to frequent complaints of jamming during combat maneuvers. The new arrangement allowed the M2 to be mounted upright, remedying most of the jamming problems. The .50 caliber Browning machine guns, although not firing an explosive projectile, had excellent ballistics and proved adequate against the Fw 190 and Bf 109 fighters that were the main USAAF opponents at the time. The wing racks fitted to the P-51D and K series were strengthened and were able to carry up to 1,000 lb of ordnance. Later models had under-wing rocket pylons added to carry up to ten rockets per plane.

The gunsight was changed from the N-3B to the N-9 before the introduction in September 1944 of the K-14B gyro-computing sight.

Alterations to the undercarriage up-locks and inner-door retracting mechanisms meant that there was a change to the shape of the inner wing leading edge, which was raked forward slightly, increasing the wing area and creating a distinctive "kink" in the leading edges of the wings.

The P-51D became the most widely produced variant of the Mustang. A Dallas-built version of the P-51D, designated the P-51K, was equipped with an Aeroproducts propeller in place of the Hamilton Standard propeller, as well as a larger, differently configured canopy and other minor alterations (the vent panel was different). The hollow-bladed Aeroproducts propeller was unreliable with dangerous vibrations at full throttle due to manufacturing problems and was eventually replaced by the Hamilton Standard. By the time of the Korean war most F-51s were equipped with "uncuffed" Hamilton Standard propellers with wider, blunt tipped blades. The photo reconnaissance versions of the P-51D and P-51K were designated F-6D and F-6K respectively. The RAF assigned the name Mustang IV to the D model and Mustang IVA to K models.

The P-51D and K started arriving in Europe in mid-1944 and quickly became the primary USAAF fighter in the theater. It was produced in larger numbers than any other Mustang variant. Nevertheless, by the end of the war, roughly half of all operational Mustangs were still B or C models.

Concern over the USAAF's inability to escort B-29s all the way to mainland Japan resulted in the highly classified "Seahorse" project. In late 1944 naval aviator (and later test pilot) Bob Elder flew carrier suitability trials with a modified P-51D. The project was canceled after U.S. Marines secured the Japanese island of Iwo Jima and its airfields, making it possible for standard P-51D models to accompany B-29s all the way to the Japanese home islands and back.

During 1945-48, some P-51Ds were also built under licence in Australia by the Commonwealth Aircraft Corporation.

The "lightweight" Mustangs

XP-51F, XP-51G and XP-51J

The USAAF required airframes built to their acceleration standard of 8.33 g, a higher load factor than that used by the British standard of 5.33 g for their fighters. Reducing the load factor to 5.33 would allow weight to be removed, and both the USAAF and the RAF were interested in the potential performance boost.

A subtle change made in the lightweight Mustangs was the use of an improved NACA 66 series airfoil and a slightly thinner wing than that used by earlier Mustangs.

In 1943, North American submitted a proposal to re-design the P-51D as model NA-105, which was accepted by the USAAF. Modifications included changes to the cowling, a simplified undercarriage with smaller wheels and disc brakes, and a larger canopy. The designation XP-51F was assigned to prototypes powered with V-1650 engines (a small number of XP-51F were passed to the British as the Mustang V) and XP-51G to those with reverse lend/lease Merlin RM 14 SM engines.

A third lightweight prototype powered by an Allison V-1710-119 engine was added to the development program. This aircraft was designated XP-51J. Since the engine was insufficiently developed, the XP-51J was loaned to Allison for engine development. None of these experimental "lightweights" went into production.

P-51H

The P-51H (or NA-126) was the final production Mustang, embodying the experience gained in the development of the XP-51F and XP-51G aircraft. This aircraft, with minor differences as the NA-129, came too late to participate in World War II, but it brought the development of the Mustang to a peak as one of the fastest production piston engine fighters to see service.

The P-51H used the new V-1650-9 engine, a version of the Merlin that included Simmons automatic supercharger boost control with water injection, allowing War Emergency Power as high as 2218 hp (or 1,500 kW). Differences between the P-51D included lengthening the fuselage and increasing the height of the tailfin, which greatly reduced the tendency to yaw. The canopy resembled the P-51D style, over a somewhat raised pilot's position. Service access to the guns and ammunition was also improved. With the new airframe several hundred pounds lighter, the extra power and a more streamlined radiator, the P-51H was among the fastest propeller fighters ever, able to reach 487 mph (or 784 km/h, or Mach 0.74) at 25,000 ft (or 7,600 m).

The P-51H was designed to complement the P-47N as the primary aircraft for the invasion of Japan with 2,000 ordered to be manufactured at Inglewood. Production was just ramping up with 555 delivered when the war ended.

Additional orders, already on the books, were cancelled. With the cutback in production, the variants of the P-51H with different versions of the Merlin engine were produced in either limited numbers or terminated. These included the P-51L, similar to the P-51H but utilizing the 2270 horsepower V-1650-11 Merlin engine, which was never built; and its Dallas-built version, the P-51M or NA-124 which utilized the V-1650-9A Merlin engine lacking water injection and therefore rated for lower maximum power, of which one was built out of the original 1629 ordered, serial number 45-11743.

Although some P-51H were issued to operational units, none saw combat in World War II, and in postwar service, most were issued to reserve units. One aircraft was provided to the RAF for testing and evaluation. Serial number 44-64192 was designated BuNo 09064 and used by the U.S. Navy to test transonic airfoil designs, then returned to the Air National Guard in 1952. The P-51H was not used for combat in the Korean War despite its improved handling characteristics, since the P-51D was available in much larger numbers and was a proven commodity.

Many of the aerodynamic advances of the P-51 (including the laminar flow wing) were carried over to North American's next generation of jet-powered fighters, the Navy FJ Fury and Air Force F-86 Sabre. The wings, empennage and canopy of the first straight-winged variant of the Fury, (the FJ-1) and the unbuilt preliminary prototypes of the P-86 and F-86 strongly resembled those of the Mustang before the aircraft were modified with swept-wing designs.

Experimental Mustangs

In early 1944 the first P-51A-1NA was fitted and tested with a lightweight retractable ski kit replacing the wheels. This conversion was made in response to a perceived requirement for aircraft which would operate away from prepared airstrips. The main oleo leg fairings were retained, but the main wheel doors and tail wheel doors were removed for the tests. When the undercarriage was retracted the main gear skis were housed in the space in the lower engine compartment made available by the removal of the fuselage .50 cal Brownings from the P-51A. The entire installation added 390 lbs to the aircraft weight and required that the operating pressure of the hydraulic system had to be increased from 1,000 psi to 1,200 psi. Flight tests showed that ground handling was good and the Mustang could take-off and land in a field length of 1,000 feet; the maximum speed was 18 mph lower, although it was thought that fairings over the retracted skis would compensate.

On 15 November 1944 a navalized P-51D-5NA started flight tests from the deck of the carrier USS Shangri-La. This Mustang had been fitted with an arrestor hook which was attached to a reinforced bulkhead behind the tail wheel opening; the hook was housed in a streamlined position under the rudder fairing and could be released from the cockpit. The tests showed that the Mustang could be flown off the carrier deck without the aid of a catapult, using a flap setting of 20 degrees down and 5 degrees of up elevator. Landings were found to be easy and by allowing the tail wheel to contact the deck before the main gear the aircraft could be stopped in a minimum distance.

While North American were concentrating on improving the performance of the P-51 through the development of the "lightweight" Mustangs, in Britain other avenues of development were being pursued. To this end at least two Mustang III, (a P-51B and a C) were fitted with different Merlin engine variants. The first of these, FX858, was fitted with a Merlin 100 by Rolls-Royce at Hucknall; this engine was similar to the RM 14 SM fitted to the XP-51G and was capable of generating 2,080 hp (or 1,551 kW) at 22,800 ft (or 6,950 m) using a boost pressure of +25 lbs (equivalent to 80" Hg) in "war emergency" setting. With this engine FX858 reached a maximum speed of 453 mph (729 km/h) at 18,000 ft (or 5,486 m), and this could be maintained to 25,000 ft (or 7,620 m). The climb rate was 4,160 ft/min (or 21 m/sec) at 14,000 ft (or 4,267).

FX901 was fitted with a Merlin 113 (also used in the de Havilland Mosquito B. Mk.35). This engine was similar to the 100 but it was fitted with a supercharger rated for higher altitudes. FX901 was capable of 454 mph (730 km/h) at 30,000 ft (9,144 m) and 414 mph at 40,000 ft (12,192 m).

Operational history

U.S. operational service

At the Casablanca Conference, the Allies formulated the Combined Bomber Offensive (CBO) plan for "round-the-clock" bombing by the RAF at night and the USAAF by day. American pre-war bombardment doctrine held that large formations of heavy bombers flying at high altitudes would be able to defend themselves against enemy interceptors with minimal fighter escort, so that precision daylight bombing using the Norden bombsight would be effective.

Both the RAF and Luftwaffe had attempted daylight bombing and discontinued it, believing advancements in single-engine fighters made multi-engined bombers too vulnerable, contrary to Giulio Douhet's thesis. The RAF had worried about this in the mid-1930s and had decided to produce an all night-bomber force, but initially began bombing operations by day. The Germans used extensive daylight bombing during the Battle of Britain in preparation for a possible invasion. Due to the high casualty rates, the Luftwaffe soon switched to night bombing (see The Blitz). Bomber Command followed suit in its raids over Germany.

Initial USAAF efforts were inconclusive because of the limited scale. In June 1943, the Combined Chiefs of Staff issued the Pointblank Directive to destroy the Luftwaffe before the invasion of Europe, putting the CBO into full implementation. The Eighth Air Force heavy bomber force conducted a series of deep penetration raids into Germany beyond the range of available escort fighters. German fighter reaction was fierce and bomber losses were severe - 20 percent in an October 14 attack on the German ball-bearing industry. This made it costly to continue such long-range raids without adequate fighter escort.

The Lockheed P-38 Lightning had the range to escort the bombers, but was available in very limited numbers in the European theater due to its Allison engines proving difficult to maintain. With the extensive use of the P-38 in the Pacific Theater of Operations, where its twin engines were deemed vital to long-range "over-water" operations, nearly all European-based P-38 units converted to the P-51 in 1944. The Republic P-47 Thunderbolt was capable of meeting the Luftwaffe on more than even terms, but did not at the time have sufficient range. The Mustang changed all that. In general terms, the Mustang was at least as simple as other aircraft of its era. It used a single, well-understood, reliable engine, and had internal space for a huge fuel load. With external fuel tanks, it could accompany the bombers all the way to Germany and back.

Enough P-51s became available to the 8th and 9th Air Forces in the winter of 1943-44, and when the Pointblank offensive resumed in early 1944, matters changed dramatically. The P-51 proved perfect for the task of escorting bombers all the way to the deepest targets, thus complementing the more numerous P-47s until sufficient Mustangs became available. The Eighth Air Force immediately began to switch its fighter groups to the Mustang, first exchanging arriving P-47 groups for those of the Ninth Air Force using P-51s, then gradually converted its Thunderbolt and Lightning groups until by the end of the year 14 of its 15 groups flew the Mustang.

Luftwaffe pilots attempted to avoid U.S. fighters by massing in huge numbers well in front of the bombers, attacking in a single pass, then breaking off the attack, allowing escorting fighters little time to react. While not always successful in avoiding contact with escort (as the tremendous loss of German pilots in the spring of 1944 indicates), the threat of mass attacks, and later the "company front" (eight abreast) assaults by armored Sturmgruppe Fw 190s, brought an urgency to attacking the Luftwaffe wherever it could be found. The P-51, particularly with the advent of the K-14 gunsight and the development of "Clobber Colleges" for the in-theater training of fighter pilots in fall 1944, was a decisive element in Allied countermeasures against the Jagdverbände.

Beginning in late February 1944 Eighth Air Force fighter units began systematic strafing attacks on German airfields that picked up in frequency and intensity throughout the spring with the objective of gaining air supremacy over the Normandy battlefield. In general these were conducted by units returning from escort missions, but beginning in March many groups also were assigned airfield attacks instead of bomber support. On April 15, VIII FC began Operation Jackpot, attacks on specific Luftwaffe fighter airfields, and on May 21 these attacks were expanded to include railways, locomotives, and rolling stock used by the Germans for movements of materiel and troops in missions dubbed "Chattanooga". The P-51 also excelled at this mission, although losses were much higher on strafing missions than in air-to-air combat, partially due to the vulnerability of the Mustang's cooling system to small arms hits. Like other fighters using liquid cooled engines, the Mustang's coolant system could be punctured by a hit from a single bullet.

The numerical superiority of the USAAF fighters, superb flying characteristics of the P-51 and pilot proficiency helped cripple the Luftwaffe's fighter force. As a result, the fighter threat to US, and later British bombers, was greatly diminished by summer 1944.

P-51s also distinguished themselves against advanced enemy rockets and aircraft. A P-51B/C with high-octane fuel was fast enough to pursue the V-1s launched toward London. The Me 163 Komet rocket interceptors and Me 262 jet fighters were considerably faster than the P-51, but as all aircraft are, were vulnerable on take-off. Chuck Yeager, flying a P-51D, was one of the first American pilots to shoot down a Me 262 when he surprised it during its landing approach. On 7 October 1944 Lt. Urban Drew, of the 365th Fighter Group, went one better. During a fighter sweep he surprised two Me 262s on take-off and shot them down. On the same day Hubert Zemke, now flying Mustangs, shot down what he thought was a Bf 109, only for the gun camera film to reveal a Me 262. On 1 November 1944, the Mustang pilots once again demonstrated that the threat could be contained with numbers. While flying as escorts for B-17s, the 20th Fighter Group was attacked by a lone Me 262, which destroyed a solitary P-51. The Me 262 then attempted to attack the bombers, only to be cut off by a mixed formation of P-51s and P-47s. The Fighter Groups competed for the kill. Eventually a P-47 pilot of the 56th, and Mustang pilots Lt Gerbe and Groce of the 352nd Fighter Groups, shared the kill.

The Eighth, Ninth and Fifteenth Air Forces' P-51 groups, all but three of which flew another type before converting to the Mustang, claimed some 4,950 aircraft shot down (about half of all USAAF claims in the European theater) and 4,131 destroyed on the ground. Losses were about 2,520 aircraft.

One of these groups, the Eighth Air Force's 4th Fighter Group, was the overall top-scoring fighter group in Europe with 1,016 enemy aircraft claimed destroyed. This included 550 claimed in aerial combat and 466 claimed on the ground.

In aerial combat, the top-scoring P-51 units (both of which exclusively flew Mustangs) were the 357th Fighter Group of the Eighth Air Force with 595 air-to-air combat victories, and the Ninth Air Force's 354th Fighter Group with 701, which made it the top scoring outfit in aerial combat of all fighter groups of any type. Martin Bowman reports that in the ETO Mustangs flew 213,873 sorties and lost 2,520 aircraft to all causes.

P-51s were deployed in the Far East later in 1944, operating in close-support and escort missions as well as operating in the Tactical Photo Reconnaissance role.

Post-World War II

In the aftermath of World War II, the USAAF consolidated much of its wartime combat force and selected the P-51 as a "standard" piston engine fighter while other types such as the P-38 and P-47 were withdrawn or given substantially reduced roles. However, as more advanced jet fighters (P-80 and P-84) were being introduced, the P-51 was relegated to secondary status.

In 1947, the newly-formed USAF Strategic Air Command employed Mustangs alongside F-6 Mustangs and F-82 Twin Mustangs, due to their range capabilities. In 1948, the designation P-51 (P for pursuit) was changed to F-51 (F for fighter) and the existing F designator for photographic reconnaissance aircraft was dropped because of a new designation scheme throughout the USAF. Aircraft still in service in the USAF or Air National Guard (ANG) when the system was changed included : F-51B, F-51D, F-51K, RF-51D (formerly F-6D), RF-51K (formerly F-6K), and TRF-51D (two-seat trainer conversions of the F-6D). They remained in service from 1946 through 1951. By 1950, although Mustangs continued in service with the USAF and many other nations after the war, the majority of the USAF's Mustangs had been surplussed or transferred to the Air Force Reserve (AFRES) and the Air National Guard (ANG).

During the Korean War, F-51s, though obsolete as fighters, were used as close ground support aircraft and reconnaissance aircraft until the end of the war in 1953. Because of its lighter structure and less availability of spare parts, the newer, faster F-51H was not used in Korea. With the aircraft being used for ground attack, their performance was less of a concern than their ability to carry a load.

At the start of the Korean War, the Mustang once again proved its usefulness. With the availability of F-51Ds in service and in storage, a substantial number were shipped via aircraft carriers to the combat zone for use initially by both the Republic of Korea Air Force (ROKAF) and USAF. Rather than employing them as interceptors or "pure" fighters, the F-51 was given the task of ground attack, fitted with rockets and bombs. After the initial invasion from North Korea, USAF units were forced to fly from bases in Japan, and F-51Ds could hit targets in Korea that short-rangedF-80 jet fighters could not. A major concern over the vulnerability of the cooling system was realized in heavy losses due to ground fire. Mustangs continued flying with USAF, Republic of Korea Air Force (ROKAF), South African Air Force (SAAF) and Royal Australian Air Force (RAAF) fighter-bomber units on close support and interdiction missions in Korea until they were largely replaced by Republic F-84 and Grumman Panther jet fighter-bombers in 1953. The South Africans continued to fly their 95 Mustangs in Korea but lost many of them by 1952.

F-51s flew in the Air Force Reserve and Air National Guard throughout the 1950s. The last American USAF Mustang was F-51D-30-NA Serial No. 44-74936, which was finally withdrawn from service with the West Virginia Air National Guard in 1957. This aircraft is now on display at the National Museum of the United States Air Force at Wright-Patterson AFB in Dayton, Ohio. It is, however, painted as P-51D-15-NA Ser No. 44-15174.

The final withdrawal of the Mustang from USAF dumped hundreds of P-51s out onto the civilian market. The rights to the Mustang design were purchased from North American by the Cavalier Aircraft Corporation, which attempted to market the surplus Mustang aircraft both in the U.S. and overseas. In 1967 and again in 1972, the USAF procured batches of remanufactured Mustangs from Cavalier, most of them destined for air forces in South America and Asia that were participating in the Military Assistance Program (MAP). These aircraft were remanufactured from existing original F-51D airframes but were fitted with new V-1650-7 engines, a new radio fit, tall F-51H-type vertical tails, and a stronger wing which could carry six 0.50-inch machine guns and a total of eight underwing hardpoints. Two 1000-pound bombs and six five-inch rockets could be carried. They all had an original F-51D-type canopy, but carried a second seat for an observer behind the pilot. One additional Mustang was a two-seat dual-control TF-51D with an enlarged canopy and only four wing guns. Although these remanufactured Mustangs were intended for sale to South American and Asian nations through the Military Assistance Program (MAP), they were delivered to the USAF with full USAF markings. They were, however, allocated new serial numbers.

The last U.S. military use of the F-51 was in 1968, when the U. S. Army employed a vintage F-51D as a chase aircraft for the Lockheed YAH-56 Cheyenne armed helicopter project. This aircraft was so successful that the Army ordered two F-51Ds from Cavalier in 1968 for use at Fort Rucker as chase planes. They were assigned the serials 68-15795 and 65-15796. These F-51s had wingtip fuel tanks and were unarmed. Following the end of the Cheyenne program, these two chase aircraft were used for other projects. One of them was fitted with a 106-mm recoilless rifle for evaluation of the weapon's value in attacking fortified ground targets.

The F-51 was adopted by many foreign air forces and continued to be an effective fighter into the mid 1980s with smaller air arms. The last Mustang ever downed in battle occurred during Operation Power Pack in the Dominican Republic in 1965, with the last aircraft finally being retired by the Dominican Air Force (FAD) in 1984.

Non-US service

The P-51 Mustang remained in service with more than 30 air forces after World War II; the last was retired from active service in the early 1980s. Here is a list of some of the countries that used the P-51 Mustang.

  • Argentina.
  • Australia : The first Royal Australian Air Force (RAAF) unit to use Mustangs was No. 3 Squadron RAAF, which converted to them at its base in Italy in November 1944. The RAAF had also decided to replace its P-40 Kittyhawks in the South West Pacific Area with P-51s, and ordered a total of about 500 Mustangs, which were to be built by the Commonwealth Aircraft Corporation (CAC), the only non-U.S. production line. In 1944, 100 P-51Ds were shipped from the U.S. in kit form to inaugurate production at Fishermans Bend, in Melbourne. CAC assembled 80 of these under the designation CA-17/Mark 20, the remaining 20 being kept unassembled as spare parts.
  • CAC then produced 120 more P-51Ds on its own (reduced from an initial order for 170), which it designated CA-18/Mark 21, 22 or 23. (The RAAF used the serial number prefix A68 for all P-51s.) The Mk.22 was a photo reconnaissance variant and the Mk.23 had newer model British-made Merlin engines. In addition, 84 P-51Ks were also shipped direct to the RAAF from the USA. However, only 17 Mustangs reached the front line squadrons of the First Tactical Air Force by the time World War II ended in August 1945. The RAAF subsequently cancelled further orders for about 200 Mustangs. No. 77 Squadron RAAF also used P-51s extensively during the first years of the Korean War, before converting to Gloster Meteor jets.
  • Bolivia : Nine Cavalier F-51D (including the two TF-51s) were given to Bolivia, under a program called Peace Condor.
  • Canada had five squadrons equipped with Mustangs during World War II. RCAF No. 400, No. 414 and No. 430 squadrons flew Mustang Mk.I (1942-1944) and Nos. 441 and 442 flew Mustang Mk.III and IVA in 1945. Postwar, a total of 150 P-51Ds were purchased and served in two regular : No. 416 "Lynx" and No. 417 "City of Windsor" and six auxiliary fighter squadrons : No. 402 "City of Winnipeg," No. 403 "City of Calgary," No. 420 "City of London," No. 424 "City of Hamilton," No. 442 "City of Vancouver" and No. 443 "City of New Westminster". The Mustangs were declared obsolete in 1956 but a number of special-duty versions served on into the early 1960s.
  • China acquired P-51Cs and Ds from the U.S. 10th AF in India by early 1945. These Mustangs were provided to the 3rd, 4th and 5th Fighter Groups of the China Air Force (CAF) and used to attack Japanese targets in occupied areas of China. After the war Chiang Kai-shek's Nationalist government used the planes against insurgent Communist forces. The Nationalists retreated to Taiwan in 1949. Pilots supporting Chiang brought most of the Mustangs with them, where the aircraft became part of the island's defence arsenal. Taiwan subsequently acquired additional Mustangs from the USAF and other sources. Some Mustangs remained on the mainland, captured by Communist forces when the Nationalists left.
  • The Costa Rica Air Force flew four F-51s from 1955-64.
  • Cuba : Some reports claim that under the terms of the 1947 Rio Pact, Cuba was supplied with F-51D Mustangs. However, after the 1959 Cuban Revolution, Cuba's Fuerza Aerea Revolucionaria illegally acquired three ex-civilian Mustangs reputedly being bought in Canada by envoys of Fidel Castro. The P-51 Mustangs did not enter service soon enough to see any action during the Cuban revolution. During the Bay of Pigs Invasion, the Mustangs were damaged on the ground, and were repaired too late to participate in the fighting. They served with the Cuban air force until they were replaced with Russian-built equipment in the early 1960s.
  • Dominican Republic : The Dominican Republic (FAD) was the largest Latin American air force to employ the F-51D with six aircraft acquired in 1948, 44 ex-Swedish F-51Ds purchased in 1948 and a further Mustang obtained from an unknown source. It was the last nation to have the F-51 Mustang in service, with some remaining in use as late as 1984.
  • El Salvador : The FAS purchased five Cavalier Mustang IIs (and one dual control Cavalier TF-51) featured wingtip fuel tanks to increase combat range and up-rated Merlin engines. Seven P-51D Mustangs were also in service.
  • France : In late 1944, the first French unit began its transition to reconnaissance Mustangs. In January 1945, the Tactical Reconnaissance Squadron 2/33 of the French Air Force took their F-6Cs and F-6Ds over Germany on photographic mapping missions. The Mustangs remained in service until the early 1950s when they were replaced by jet fighters.
  • Germany : Several P-51s were captured by the Luftwaffe following crash-landings. These aircraft were subsequently repaired and test flown by the "Zirkus Rosarius" or "Rosarius Staffel" for combat evaluation at Göttingen. The aircraft were repainted with German markings and bright yellow nose and belly for identification. A number of P-51B and C (including examples marked with Luftwaffe codes T9+CK, T9+FK, T9+HK and T9+PK) and three P-51D were captured. Some of these P-51s were found by Allied forces at the end of the war, others crashed during testing.
  • Guatemala : Guatemala (FAG) had 30 P-51s in service from 1954 to the early 1970s.
  • Haiti : Haiti had four Mustangs when President Paul Eugène Magloire was in power between 1950 and 1956, with the last retired in 1973-74 and sold for spares to the Dominican Republic.
  • Honduras : Seven Mustangs were acquired from private sources to fight in the so-called "Football War" against El Salvador.
  • Indonesia : Indonesia acquired some F-51s from the departing Netherlands East Indies Air Force in 1949/1950. The Mustangs were used against Commonwealth (RAF, RAAF and RNZAF) forces during the Indonesian confrontation in the early 1960s. The last time Mustangs were to be deployed for military purposes was a shipment of six Cavalier II Mustangs (without tip tanks) delivered to Indonesia in 1972-1973, which were replaced in 1976.
  • Israel : A few P-51 Mustangs were illegally bought by Israel in 1948 for use in the War of Independence (1948) and quickly established themselves as the best fighter in the Israeli inventory. Further aircraft were bought from Sweden and Nicaragua but were replaced by jets at the end of the 1950s, but not before the type was used in the Suez Crisis, Operation Kadesh (1956). Reputedly, during this conflict, one daring Israeli pilot literally cut communications between Suez City and the Egyptian front lines by using his Mustang's propeller on the telephone wires.
  • Italy : During the war, from 1943-45, Italian pilots faced an increasing number of Mustangs, but only in the last years were they the main threat, because P-38s and P-47s were still present in great numbers. Mustangs were generally quite superior to Italian fighters, both indigenous types and the Bf 109s given by Germany, but some Mustangs were lost as well in those aerial battles. No Italian pilot flew Mustangs before the end of the war.
  • Italy was a postwar operator of P-51Ds; deliveries were slowed by the Korean war, but between September 1947 and January 1951, by MDAP count, 173 examples were delivered. They were used in all the AMI fighter units : 2, 3, 4, 5, 6, and 51 Stormo (Wing) and some in schools and experimentals units. Considered a "glamorous" fighter, P-51s were even used as personal aircraft by several Italian commanders. Some restrictions were placed on its use due to unfavorable flying characteristics. Handling had to be done with much care when fuel tanks were fully utilized and several aerobatic maneuvers were forbidden. Overall, the P-51D was highly rated even compared to the other primary postwar Italian fighter, the Supermarine Spitfire, partly because these P-51Ds were in very good condition in contrast to all other Allied fighters supplied to Italy. Phasing out of the Mustang began in summer 1958.
  • Japan : The P-51C-11-NT "Evalina" marked as "278" (former USAAF serial : 44-10816) flown by 26th FS, 51st FG, was hit by gunfire on 16 January 1945 and belly landed on Suchon Airfield in China which was held by the Japanese. The Japanese repaired the aircraft, roughly applied Hinomaru roundels and flew the aircraft to the Fussa evaluation centre (now Yokota Air Base) in Japan.
  • Netherlands : The Royal Netherlands East Indies Army Air Force received 40 P-51s and flew them in the Indonesian conflict. When the conflict was over Indonesia received some of the ML-KNIL Mustangs.
  • Nicaragua : Nicaragua (GN) gained 26 Mustangs from Sweden in 1954 and used them until 1964.
  • New Zealand : New Zealand ordered 320 P-51 Mustangs as a partial replacement of its F4U Corsairs in the Pacific Ocean Areas theatre. Thirty were delivered in 1945 but the war ended before they entered service. The remainder were retained in the U.S. The 30 received were stored in their packing cases until 1950 when put into service with the New Zealand Territorial Air Force (TAF)'s Auckland, Wellington, Canterbury and Otago squadrons. The TAF was disbanded in 1957 and the Mustangs retired, one being retained by 42 Squadron for regular target towing duties, and the remainder being sold for scrap. RNZAF pilots in the Royal Air Force also flew the P-51 and at least one New Zealand pilot scored victories over Europe while on loan to a USAAF P-51 squadron. A Mustang is on display in the RNZAF Museum and three other privately owned Mustangs are airworthy in the country.
  • Philippines : The Philippines acquired P-51 Mustangs after World War II. These became the backbone of the postwar Philippine Army Air Corps and Philippine Air Force and were used extensively during the Huk campaign, fighting against Communist insurgents. Mustangs were also the first aircraft of the Philippine air demonstration squadron, which was formed in 1953 and given the name "The Blue Diamonds" the following year. The Mustangs were replaced by F-86 Sabres in the late 1950s.
  • Poland : During World War II, five Polish Air Force in Great Britain squadrons used Mustangs. The first Polish unit equipped (7 June 1942) with Mustang Mk.Is was Flight B of No. 309 Polish Army-Cooperation Squadron, followed by Flight A in March 1943. Subsequently, 309 Squadron was renamed No. 309 Polish Fighter-Reconnaissance Squadron and became part of Fighter Command. On 13 March 1944, No. 316 Polish Fighter Squadron received their first Mustang Mk.IIIs; rearming of the unit was completed by the end of April. By 26 March 1943, No. 306 Polish Fighter Squadron and No. 315 Polish Fighter Squadron received Mustangs Mk.IIIs (the whole operation took 12 days). On 20 October 1944, Mustang Mk.Is in No. 309 Squadron were replaced by Mk.IIIs. On 11 December 1944, the unit was again renamed, as No. 309 Polish Fighter Squadron. In 1945, No. 303 Polish Fighter Squadron received 20 Mustang Mk.IV and Mk.IVA replacements. Postwar, between 6 December 1946 and 6 January 1947, all five Polish squadrons equipped with Mustangs were disbanded. Poland returned approximately 80 Mustangs Mk.IIIs and 20 Mustangs Mk.IV and IVAs to the RAF, which transferred them to the U.S. government.
  • Somalia.
  • South Africa : The South African Air Force operated a number of Mustang Is and IIs (P-51A) in Italy and the Middle East during World War II. After VE-Day, these machines were soon struck off charge and scrapped. In 1950, 2 Squadron SAAF was supplied with F-51D by the United States for Korean War service. The type performed well in South African hands before being replaced by the F-86 Sabre in 1952/1953.
  • South Korea : Within a month of the outbreak of the Korean War, 10 F-51D Mustangs were provided to the badly depleted Republic of Korea Air Force as a part of the Bout One Project. They were flown by both South Korean airmen, several of whom were veterans of the Imperial Japanese Army and Navy air services during World War II as well as by U.S. advisers led by Major Dean Hess. Later, more were provided both from U.S. and from South African stocks, as the latter were converting to F-86 Sabres. They formed the backbone of the South Korean Air Force until they were replaced by Sabres.
  • Taiwan See China above.
  • Soviet Union : The Soviet Union received at least 10 early-model Mustangs and tested them in combat. Some reports suggest that other Mustangs that were abandoned in Russia after the famous "shuttle missions" were repaired and used by the Soviet Air Force, but not in front line service.
  • Sri Lanka.
  • Sweden : Sweden's Flygvapnet first recuperated four of the P-51s (two P-51Bs and two early P-51Ds) that had been diverted to Sweden during missions over Europe. In February 1945, Sweden purchased 50 P-51Ds designated J 26, which were delivered by American pilots in April and assigned to the F 16 wing at Uppsala as interceptors. In early 1946, the F 4 wing at Östersund was equipped with a second batch of 90 P-51Ds. A final batch of 21 airplanes was purchased in 1948. In all, 161 J 26s served in the Swedish Air Force during the late 1940s. About a dozen were modified for photo reconnaissance and re-designated S 26. A few of these aircraft participated in the top secret Swedish mapping of new Soviet military installations at the Baltic coast in 1946-47, a project that entailed many intentional violations of Soviet airspace. However, the Mustang could outdive any Soviet fighter of that era, so no S 26 was lost in these missions. The J 26s were replaced by de Havilland Vampires around 1950. The S 26s were replaced by S 29Cs in the early 1950s.
  • Switzerland : The Swiss Air Force operated a few USAAF P-51s which had been impounded by Swiss authorities during World War II after the pilots were forced to land in neutral Switzerland. After the war, Switzerland also bought 130 P-51s for $4,000 each. They served until 1958.
  • United Kingdom : The RAF was the first air force to operate the P-51 which was originally designed to meet RAF requirements. The first P-51As (RAF Mustang I) entered service in 1941, wearing the standard RAF fighter markings. Due to poor high-altitude performance, the Mustangs were soon transferred to Army co-operation and fighter reconnaissance duties. On 27 July 1942, sixteen RAF Mustangs undertook their first long-range reconnaissance mission over Germany. During Operation Jubilee, the Dieppe Raid (19 August 1942), four British and Canadian Mustang squadrons, including No. 26 Squadron RAF saw action. By 1943/1944, British Mustangs were used extensively to seek out V-1 flying bomb sites. The final RAF Mustang I and Mustang II machines were struck off charge in 1945. The RAF operated several Mustang III, (the P-51B and C) machines, the first units converting to the type in late 1943/1944. Mustang III units were operational until the end of World War II, though many units had already converted to the Mustang IV (the P-51D and K). RAF pilots preferred the Mustang III (with Malcolm hood), but the RAF re-equipped with Mustang IVs. As the Mustang was a Lend-Lease type, all aircraft still on RAF charge at the end of the war were either returned to the USAAF "on paper" or retained by the RAF for scrapping. The final Mustangs were retired from RAF use in 1947.
  • Uruguay (FAU) used 25 F-51D Mustangs from 1950 to 1960 - some were subsequently sold to Bolivia.
  • Venezuela (FAV) used only a sole Mustang which was acquired from another Latin American country.

P-51s and civil aviation

Many P-51s were sold as surplus after the war, often for as little as $1,500. Some were sold to former wartime fliers or other aficionados for personal use, while others were modified for air racing.

One of the most prominent Mustangs involved in air racing was a surplus P-51C purchased by Paul Mantz, a film stunt pilot. The aircraft was modified by creating a "wet wing", sealing the wing to create a giant fuel tank in each wing, which eliminated the need for fuel stops or drag-inducing drop tanks. This Mustang, called "Blaze of Noon", came in first in the 1946 and 1947 Bendix Air Races, second in the 1948 Bendix and third in the 1949 Bendix. He also set a U.S. coast-to-coast record in 1947. The Mantz Mustang was sold to Charles F. Blair Jr (future husband of Maureen O'Hara) and re-named "Excaliber III". Blair used it to set a New York-to-London record in 1951. Later that same year he flew from Norway to Fairbanks, Alaska, via the North Pole, proving that navigation via sun sights was possible over the magnetic north pole region. For this feat, he was awarded the Harmon Trophy and the Air Force was forced to change its thoughts on a possible Soviet air strike from the north. This Mustang now resides in the National Air and Space Museum at Steven F. Udvar-Hazy Center.

The most prominent firm to convert Mustangs to civilian use was Trans-Florida Aviation, later renamed Cavalier Aircraft Corporation, which produced the Cavalier Mustang. Modifications included a taller tailfin and wingtip tanks. A number of conversions included a Cavalier Mustang specialty : a "tight" second seat added in the space formerly occupied by the military radio and fuselage fuel tank.

Ironically, in the late 1960s and early 1970s when the United States Department of Defense wished to supply aircraft to South American countries and later Indonesia, for close air support and counter insurgency, it turned to Cavalier to return some of their civilian conversions back to updated military specifications.

The P-51 is perhaps the most sought after of all warbirds on the civilian market; the average price usually exceeds $1 million, even for only partially restored aircraft. Some privately owned P-51s are still flying, often associated with organizations such as the Commemorative Air Force (formerly the Confederate Air Force).

Variants

  • NA-73X : The initial prototype was designated the NA-73X by the manufacturer, North American Aviation.
  • Mustang I : The first production contract was awarded by the British for 320 NA-73 fighters. This aircraft was named Mustang I by the British. A second British contract for 300 more Mustang Is was assigned a model number of NA-83 by North American.
  • XP-51 : Two aircraft of this lot delivered to the USAAF were designated XP-51.
  • P-51 : In September 1940, 150 aircraft designated NA-91 by North American were ordered under the Lend/Lease program. These were designated by the USAAF as P-51 and initially named the Apache although this name was dropped early-on for Mustang. The British designated this model as Mustang IA. They were equipped with four long-barrelled 20 mm Hispano-Suiza Mk.II cannon instead of machine guns. A number of aircraft from this lot were fitted out by the USAAF as photo reconnaissance aircraft and designated F-6A. The British would fit a number of Mustang I fighters with photographic reconnaissance equipment as well. Also, two aircraft of this lot were fitted with the Packard-built Merlin engine and were designated by North American as model NA-101 and by the USAAF initially as the XP-78, but re-designated quickly to XP-51B.
  • In early 1942, the USAAF ordered a lot of 500 aircraft modified as dive bombers that were designated A-36A. North American assigned the aircraft the model number NA-97. This model became the first USAAF Mustang to see combat. One aircraft was passed to the British who gave it the name Mustang I (Dive Bomber).
  • Following the A-36A order the USAAF ordered 310 model NA-99 fighters that were designated P-51A by the USAAF. and Mustang II by the RAF. A number of this lot of aircraft were equipped with K-24 cameras and designated F-6B. All these models of the Mustang were equipped with Allison V-1710 engines except the prototype XP-51B.
  • Beginning with the model NA-102 Mustang the Packard built Merlin V-1650 engine replaced the Allison. In the summer of 1943 Mustang production was begun at a new plant in Dallas, Texas as well as at the existing facility in Inglewood, California. The model NA-102 was produced as the P-51B in Inglewood while the NA-103 as the P-51C was produced at Dallas. The RAF named these models Mustang III. Again, a number of the P-51B and P-51C aircraft were fitted for photo Reconnaissance and designated F-6C.
  • The prototypes of the bubble canopy change were designated model NA-106 by North American and P-51D by the USAAF. The production version, while retaining the P-51D designation, was assigned a model number NA-109 by North American. The "D" became the most widely produced variant of the Mustang. A variation of the P-51D equipped with an Aeroproducts propeller in place of the Hamilton Standard propeller was designated the P-51K. The photo versions of the P-51D and P-51K were designated F-6D and F-6K respectfully. The RAF assigned the name Mustang IV to the "D" model and Mustang IVA to "K" models.
  • As the USAAF specifications required airframe design to a higher load factor than that used by British for their fighters, consideration was given to re-designing the Mustang to the lower British requirements in order to reduce the weight of the aircraft and thus improve performance. In 1943, North American submitted a proposal to do the re-design as model NA-105, which was accepted by the USAAF. The designation XP-51F was assigned for prototypes powered with V-1650 engines and XP-51G to those with reverse lend/lease Merlin 145M engines. Modifications included changes to the cowling, a simplified undercarriage with smaller wheels and disk brakes, and a larger canopy. A third prototype was added to the development that was powered by an Allison V-1710 engine. This aircraft was designated XP-51J. As the engine was insufficiently developed the XP-51J was loaned to Allison for engine development. A small number of XP-51Fs were passed to the British as the Mustang V.
  • The final production Mustang, the P-51H embodied the experience gained in the development of the lightweight XP-51F and XP-51G aircraft. This aircraft, model NA-126 and with minor differences NA-129, came too late to participate in World War II, but it brought the development of the Mustang to a peak and was one of the fastest production piston engine fighters to see service. The P-51H used the Merlin V-1659-9 engine, equipped with Simmons automatic boost control and water injection, allowing War Emergency Power as high as 2,218 horsepower. Some of the weight savings inherited from the XP-51F and XP-51G were invested in lengthening the fuselage and increasing the height of the tailfin, greatly reducing the tendency to yaw, and in restoring the fuselage fuel tank. The canopy was changed back to more nearly resemble the P-51D style, over a somewhat raised pilot's position. Service access to the guns and ammunition was improved. The P-51H was designed to complement the P-47N as the primary aircraft for the iinvasion of Japan and 2,000 were ordered to be built at the Inglewood plant. With the solution to the problem of yaw control, the P-51H was now considered a suitable candidate for testing as an aircraft carrier based fighter; but with the end of the war, the testing was cut short, and production was halted after 555 aircraft were built. Although some P-51Hs were issued to operational units, none saw combat. One aircraft was given to the RAF for testing and evaluation. Serial number 44-64192 was re-serialled BuNo 09064 and used by the Navy to test transonic airfoil designs, then returned to the Air National Guard in 1952. The P-51H was not used for combat in the Korean War despite its improved handling characteristics, due to the lack of experience with durability of the lighter airframe under combat conditions as well as limited numbers in the USAF inventory.
  • With the cutback in production the variants of the P-51H with different versions of the Merlin engine were produced in either limited numbers or terminated. These included the P-51L, similar to the P-51H but utilizing the 2270 horsepower V-1650-11 Merlin engine, which was never built; and its Dallas-built version, the P-51M or NA-124 which utilized the V-1650-9A Merlin engine lacking water injection and therefore rated for lower maximum power, of which one was built out of the original 1629 ordered, serial number 45-11743.

Production

The total number built reached 15,875 units. (among American fighter aircraft second only to the P-47 Thunderbolt).

Versions resume

  • NA.73X : Prototype : One built.
  • Mustang I (P-51) (First production aircraft) :
    • Engine : 1,150 hp (at sea level) Allison V-1710-F3R.
    • Armament : Two .50 machine guns in the fuselage, plus two .50 and two .30 in the wings.
    • 150 built.
  • Mustang II (P-51A) :
    • Engine : 1,200 hp (at sea level) Allison V-1710-F20R.
    • Armament : Four .50 machine guns in the wings.
    • 310 built at Inglewood, California.
  • Mustang III (1943 P-51B and P-51C) :
    • Engine : 1,520 hp Merlin V-1650-3, with two stage - two speed supercharger and aftercooler.
    • Propeller : Hamilton Hydromatic constant speed four bladed.
    • Armament : Four .50 machine guns in the wings. Under wing racks for two 1,000 lbs bombs or extra fuel tanks.
  • P-51B : 1,988 built at Inglewood.
  • P-51C : 1,750 built at Dallas, Texas.
  • Mustang IV (P-51D) : The poor rearward visibility of the C and D models led to the design of a moulded plastic sliding hood that allowed a full 360° view. The British Inglewood factory produced 6,502 machines while another 1,454 were built by the Dallas plant in Texas. 136 of these machines were later converted into the F-6D-20NT reconnaissance model for the USAAF. The last 1,100 machines coming out of Inglewood will be fitted with 5 inch rocket launchers besides their standard six .50 machine guns in the wings. Equipped with droppable tanks, the P-51D will also serve in the Pacific. They were notably used during the first attack against Tokyo to take off from a ground airfield on the 7th of April, 1945. The endurance reached by then over height hours and the range over 3,300 km. A total of 8,156 were built : 6,502 at Inglewood, 1,454 at Dallas and 200 by CAC at Fisherman's Bend, Australia.
  • XP-51F (Interceptor) :
    • Lightweight version, thanks to a complete structural redesign (Wing, fuselage, landing gear, etc). The one ton lighter aircraft reached a top speed of 466 mph (750 km/h) in 1944 but never reached production. (Three built).
    • Engine : 1.695 hp Merlin V-1650-7.
    • Armament : Four .50 wing mounted machine guns.
    • Smaller fuel tank capacity.
  • XP-51G : Long range escort. First flight in Augustus 1944. Like the -51F, this plane never got to production (Two built). Both types were mainly used for further development of the later P-51H.
    • Engine : 1.910 hp Merlin 145M.
    • Propeller : Rotol five bladed.
    • Armament : Six .50 wing mounted machine guns.
    • Additional fuselage fuel tank.
  • P-51H :
    • Engine : 2000 hp Water injection Merlin V-1650-11.
    • Armament : Six .50 wing mounted machine guns. Ten 5 inches rockets or two 1,000 lbs bombs.
    • 555 built at Inglewood.
  • XP-51J : Two built.
  • P-51K :
    • Apart for its Aero-Products four bladed constant speed propeller replacing the Hamilton Standard device, this version is basically identical to the P-51D.
    • 1,500 built.
  • P-51L : None built - cancelled.
  • P-51M : One built at Dallas.
  • XP-82 :
    • With two P-51H fuselages fixed together, planned as long range escort fighter, the XP-82 had a wing span of 50.8 ft and a max take off weight of 21,210 lbs.
    • A-36A (Dive brakes equipped, attack / dive bomber) :
    • Engine : Allison V-1710-87 (F21R).
    • Armament : Two .50 machine guns in the fuselage, plus four .50 in the wings.
  • F-6 (Photo reconnaissance) :
    • Engine : 1200 hp Allison V-1710-81 (F20R)
    • Armament : None.
  • Cavalier Special : In 1954, Trans Florida Aviation Inc. Bought development rights on the Mustang willing to convert the aircraft into a civil version. The Cavalier 2000 eventually came out in 1961, recognisable to its wing tips fuel tanks. In 1967, a military version is derived, powered by a Merlin 620 engine. It will be mainly used in South America. Some machines will be fitted with powerful turboprops like the RR Dart 510 or the 2,535 hp Lycoming T-55.

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This text is available under the Creative Commons Attribution-ShareAlike License
Source : Article North American P-51 Mustang of Wikipedia ( authors )

North American P-51 Mustang

  • Role : Fighter.
  • National origin : United States.
  • Manufacturer : North American Aviation.
  • First flight : 26 October 1940.
  • Introduction : January 1942 (RAF).
  • Status : Retired from military service 1984 (Dominican Air Force).
  • Primary users :
    • United States Army Air Forces.
    • Royal Air Force.
    • Royal New Zealand Air Force.
    • Royal Canadian Air Force.
  • Number built : More than 15,000.
  • Variants :
    • North American A-36.
    • Rolls-Royce Mustang Mk.X.
    • CAC Mustang.
    • Cavalier Mustang.
  • Developed into :

    • Spécifications (P-51A)

  • Length : 32 ft 3 in (or 9,83 m).
  • Height : 12 ft 2 in (or 3,71 m).
  • Wing span : 37 ft (or 11,28 m).
  • Wing area : 233 ft² (or 21.65 m²).
  • Max. gross weight : 23,370 lbs (or 10,600 kg).
  • Empty weight : 6,433 lbs (or 2,920 kg).
  • Max. Speed : 390 mph (or 339 kts or 628 km/h) at 20,000 ft (or 6,100 m).
  • Service ceiling : 31,350ft (or 9,550 m).
  • Max. range : 854 mi (or 742 nm or 1,374 km).
  • Engine : One Allison V-1710-81.
  • Power : 1,200 hp (or 895 kW).
  • Armament : Four .50 in wing mounted machine guns.

    • Specifications (P-51D)

  • Length : 32 ft 3 in (or 9.83 m).
  • Height : 13 ft 8 in (or 4.17 m).
  • Wingspan : 37 ft (or 11.28 m).
  • Wing area : 235 ft² (or 21.83 m²).
  • Wing loading : 39 lb/ft² (or 192 kg/m²).
  • Empty weight : 7,635 lb (or 3,465 kg).
  • Loaded weight : 9,200 lb (or 4,175 kg).
  • Max. takeoff weight : 12,100 lb (or 5,490 kg).
  • Max. speed : 437 mph (or 703 km/h) at 25,000 ft (or 7,620 m).
  • Cruise speed : 362 mph (or 580 km/h).
  • Stall speed : 100 mph (or 160 km/h).
  • Range : 1,650 mi (or 2,755 km) with external tanks.
  • Service ceiling 41,900 ft (or 12,770 m).
  • Rate of climb : 3,200 ft/min (or 16.3 m/s).
  • Powerplant : One Packard Merlin V-1650-7 liquid-cooled supercharged V-12.
  • Power : 1,695 hp (or 1,265 kW).
  • Power/mass : 0.18 hp/lb (or 300 W/kg).
  • Armament : Six .50 in wing mounted machine guns.

    • Specifications (P-51H)

  • Length : 33 ft 4 in (or 10.16 m).
  • Height : 11 ft 1 in (or 3.38 m).
  • Wingspan : 37 ft (or 11.28 m).
  • Wing area : 235 ft² (or 21.83 m²).
  • Wing loading : 40.4 lb/ft² (or 197.4 kg/m²).
  • Empty weight : 7,040 lb (or 3,195 kg).
  • Loaded weight : 9,500 lb (or 4,310 kg).
  • Max. takeoff weight : 11,500 lb (or 5,215 kg).
  • Max. speed : 487 mph (or 784 km/h) at 25,000 ft (or 7,600 m).
  • Range : 1,160 mi (or 1,865 km) with external tanks.
  • Service ceiling 41,600 ft (or 12,680 m).
  • Rate of climb : 3,300 ft/min (or 16.8 m/s).
  • Powerplant : One Packard Merlin V-1650-9 liquid-cooled supercharged V-12 engine.
  • Power : 1,380 hp (or 1,030 kW) military; 2,218 hp (or 1,655 kW) WEP.
  • Power/mass : 0.23 hp/lb (or 385 W/kg).
  • Armament : Six .50 in (or 12.7 mm) Browning machine guns with 1,880 total rounds (400 rounds for each on the inner pair, and 270 rounds for each of the outer two pair), or 4 of the same guns with 1,600 total rounds (400 per gun).

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