(Vought) F7U Cutlass @·AIRCRAFTUBE

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Vought F7U Cutlass

The Vought F7U Cutlass was a United States Navy carrier-based jet fighter and fighter-bomber of the early Cold War era. It was a highly unusual, semi-tailless design, allegedly based on aerodynamic data and plans captured from the German Arado company at the end of World War II, though Vought designers denied any link to the German research at the time. The F7U was the last aircraft designed by Rex Beisel, who was responsible for the first fighter ever designed specifically for the U.S. Navy, the Curtiss TS-1 of 1922.

Regarded as a radical departure from traditional aircraft design, the Cutlass suffered from numerous technical and handling problems throughout its short service career. The type was responsible for the deaths of four test pilots and 21 other U.S. Navy pilots. Over one quarter of all Cutlasses built were destroyed in accidents. The poor safety record was largely the result of the advanced design built to apply new aerodynamic theories and insufficiently powerful, unreliable engines.

Design and development

The Cutlass was Vought's entry to a U.S. Navy competition for a new carrier capable day fighter opened on 1 June 1945. Former Messerschmitt AG senior designer Waldemar Voigt, who supervised in Nazi Germany the development of numerous experimental jet fighters, contributed to its design with his experience in the development of the Messerschmitt P.1110 and P.1112 projects. The requirements were for an aircraft that was able to fly at 600 miles per hour (970 km/h) at 40,000 feet (12,000 m). The design featured broad chord, low aspect ratio, swept wings, with twin wing-mounted tail fins either side of a short fuselage. The cockpit was situated well forward to provide good visibility for the pilot during aircraft carrier approaches. The design was given the company type number of V-346 and then the designation F7U when it was announced the winner of the competition.

Pitch and roll control was provided by elevons, though Vought called these surfaces "ailevators" at the time. Slats were fitted to the entire span of the leading edge. All controls were hydraulically-powered. The very long nose landing gear strut required for high angle of attack takeoffs was rather weak, and a collapse could seriously jeopardize the pilot's safety. The F7U was also largely let down by its underpowered Westinghouse turbojets, an engine that some pilots quipped, "put out less heat than the same company's toasters." Naval aviators referred to the F7U as the "Gutless" or, in kinder moments, as the "Praying Mantis".

Operational history

Three prototypes were ordered in 1946, with the first example flying on 29 September 1948, piloted by Vought's Chief Test Pilot, J. Robert Baker. The maiden flight took place from Naval Air Station Patuxent River and was not without its problems. During testing one of the prototypes reached a maximum speed of 625 mph (1,058 km/h)

Production orders were placed for the F7U-1 in a specification very close to the prototypes, and further developed F7U-2 and F7U-3 versions with more powerful engines. Because of development problems with the powerplant, however, the F7U-2 would never be built, while the F7U-3 would incorporate many refinements suggested by tests of the -1. The first 16 F7U-3s had non-afterburning Allison J35-29 engines. The -3 with its Westinghouse J46-WE-8B turbojets would eventually become the definitive production version, with 288 aircraft equipping 13 U.S. Navy squadrons. Further development stopped once the Vought F8U Crusader flew.

The F7U bore the fleet nickname of the Gutless Cutlass in reference to its lack of sufficient engine thrust; consequently its carrier landing and takeoff performance was notoriously poor. The J35 was known to flame out in rain, a very serious fault.

The first fleet squadron to receive F7Us was Fighter Squadron 81 (VF-81) in April 1954; the last with Cutlasses was Attack Squadron 66 (VA-66) in November 1957. Few squadrons made deployments with the type, and most "beached" them ashore during part of the cruise owing to operating difficulties. Those units known to have taken the type to sea were:

Fighter Squadron 124 (VF-124), USS Hancock (CVA-19), August 1955 – March 1956;
VF-81, USS Ticonderoga (CVA-14), November 1955 – August 1956;
Attack Squadron 86 (VA-86), USS Forrestal (CVA-59), January – March 1956 Shakedown Cruise;
VA-83, USS Intrepid (CVA-11), March – September 1956;
VA-116, USS Hancock (CVA-19), April - September 1957;
VA-151, USS Lexington (CVA-16), May - December 1956;
VA-212, USS Bon Homme Richard (CVA-31), August 1956 – February 1957.
Air Test and Evaluation Squadron 4 (VX-4), USS Shangri-La (CVA-38) and USS Lexington (CVA-16)

Blue Angels

The Navy Flight Demonstration Squadron, the Blue Angels, flew two F7U-1 Cutlasses as a side demonstration during their 1953 show season in an effort to promote the new aircraft, but did not use them as part of their regular formation demonstration. Both the pilots and ground crews found the aircraft generally unsatisfactory and it was apparent that the type was still experiencing teething troubles.

During the Blue Angels' first airshow appearance in 1953, pilot LT Edward "Whitey" Feightner, the former program manager for the F7U, experienced a total loss of hydraulics on a full afterburner takeoff and steep climb. While trying to gain enough altitude for ejection he was able to stay with the aircraft until the back up system came on. He clipped trees on the end of the runway, causing the left engine to flame out. With hydraulic fluid streaming back in a bright flame, he made a hard turn and got the plane back on the runway, much to the excitement of the crowd. Later, while traveling to an airshow at Naval Air Station Glenview in Chicago, Illinois, Blue Angel pilot LT Harding MacKnight experienced an engine flameout in his Cutlass, forcing him to make an emergency landing at NAS Glenview. Traveling with him, LT Feightner was redirected to make his landing at Chicago's former Orchard Airpark, which had been expanded and renamed O'Hare Airport. The runway had just been completed and was covered with peach baskets to prevent aircraft from landing until it was opened. LT Feightner was told to ignore the baskets and land on the new runway. As a result, LT Feightner's F7U became the first aircraft to land on the new runway for Chicago's O'Hare International Airport.

Following these incidents, the two Cutlasses were deemed unsuitable for demonstration flying and were flown to Naval Air Station Memphis, Tennessee, where they were abandoned to become aircraft maintenance instructional airframes for the Naval Technical Training Center.

Variants

XF7U-1
Three prototypes ordered on 25 June 1946. First flight, 29 September 1948, all three aircraft were destroyed in crashes.
F7U-1
The initial production version, 14 built. Powered by two J34-WE-32 engines.
F7U-2
Proposed version, planned to be powered by two Westinghouse J34-WE-42 engines with afterburner, but the order for 88 aircraft was cancelled.
XF7U-3
Designation given to one aircraft built as the prototype for the F7U-3, BuNo 128451. First flight: 20 December 1951.
F7U-3
The definitive production version, 192 built.
F7U-3P
Photo-reconnaissance version, 12 built. With a 25 in longer nose and equipped with photo flash cartridges none of these aircraft saw operational service, being used only for research and evaluation purposes.
F7U-3M
This missile capable version was armed with four AAM-N-2 Sparrow I air-to-air beam-riding missiles, 98 built. A total of 48 F7U-3 existing airframes were upgraded to F7U-3M standard. An order for 202 aircraft was cancelled.
A2U-1
Designation given to a cancelled order of 250 aircraft to be used in the ground attack role.

Aircraft on display

Seven F7U Cutlass aircraft are known to have survived.

F7U-3 Cutlass, BuNo 128451, is under restoration at the USS Midway (CV-41) Museum in San Diego, California, to be combined with BuNo 129565 to make one complete aircraft. Prototype F7U-3. Formerly at the Fred E. Weisbroad Aviation Museum/International B-24 Museum in Pueblo, Colorado. It was unrestored and incomplete, in poor condition.

F7U-3 Cutlass, BuNo 129554, is under restoration at the Museum of Flight in Everett, Washington. Purchased by Len Berryman from Geiger Field, Washington in May 1958 and displayed outside the Berryman War Memorial Park in Bridgeport, Washington from 1958 until 1992. In June 1992 it was sold to Tom Cathcart of Ephrata, Washington for restoration to eventual flying condition.

F7U-3 Cutlass, BuNo 129565, was undergoing restoration for display at the USS Hornet (CV-12) Museum at the former NAS Alameda in Alameda, California. It has now been transferred to USS Midway (CV-41) Museum in San Diego, California to be combined with BuNo 128451 to make one complete aircraft.

F7U-3 Cutlass, BuNo 129622, is under restoration by F7U historian Al Casby of Phoenix, Arizona. Ex VA-34 / VA-12 aircraft that was flown to Naval Air Reserve Training Unit (NARTU) Glenview, NAS Glenview, Illinois, where it was sporadically flown by Naval Air Reserve pilots and used for instruction of enlisted Naval Reserve aircraft maintenance personnel; ownership was then transferred to the Northbrook East Civic Association and the aircraft was moved to the Oaklane Elementary School for playground use. It was subsequently removed and dissected to be sold for its engines. Forward fuselage was part of Earl Reinart's collection in Mundelein, Illinois, while the rest of the aircraft went to J-46 dragster builder Fred Sibley in Elkhart, Inidana. Its components are currently reunited in the collection of noted F7U historian Al Casby.
F7U-3M at the National Museum of Naval Aviation at NAS Pensacola, Florida

F7U-3 Cutlass, BuNo 129642, is on display at the Wings of Freedom Aviation Museum at the Naval Air Station Joint Reserve Base Willow Grove, Pennsylvania. The aircraft belonged to Attack Squadron 12 (VA-12) and was flown to NAS Willow Grove in May 1957 to take part in an air show. Upon arrival the aircraft was stricken from active duty. It was transferred to the Naval Reserve for use as a ground training aircraft, and eventually placed as a gate guard in front of the base on US Route 611. The airframe has only 326.3 hours total flight time.

F7U-3 Cutlass, BuNo 129655, is on display at the National Museum of Naval Aviation at NAS Pensacola, Florida. Although marked as an F7U-3M, this aircraft is in reality an F7U-3 which was factory upgraded to F7U-3M standards. Formerly displayed at Griffith Park, California.

F7U-3 Cutlass, BuNo 129685, is on display at the aircraft collection of the late Walter Soplata in Newbury, Ohio. Like most aircraft on this famous farm, the aircraft appears complete, though it is exposed to the elements and unrestored.

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This text is available under the Creative Commons Attribution-ShareAlike License
Source : Article Vought F7U Cutlass of Wikipedia ( authors )

Specifications (F7U-3M)

  • Crew : 1
  • Length : 41 ft 3.5 in (12.586 m).
  • Height : 14 ft 0 in (4.27 m).
  • Wingspan : 39 ft 8 in (12.1 m).
  • Span wings folded : 22.3 ft (6.80 m).
  • Wing area : 496 sq ft (46.1 m²).
  • Wing loading : 50.2 lb/sq ft (245 kg/m²).
  • Empty weight : 18,210 lb (8,260 kg).
  • Gross weight : 26,840 lb (12,174 kg)
  • Max takeoff weight : 31,643 lb (14,353 kg).
  • Maximum speed : 606 kn (697 mph; 1,122 km/h) at sea level with Military power + afterburner.
  • Cruise speed : 490 kn (564 mph; 907 km/h) at 38,700 ft (11,796 m) to 42,700 ft (13,015 m).
  • Stall speed : 112 kn (129 mph; 207 km/h) power off at take-off. 93.2 kn (173 km/h) with approach power for landing.
  • Combat range : 800 nmi (921 mi; 1,482 km).
  • Service ceiling : 40,600 ft (12,375 m).
  • Rate of climb : 14,420 ft/min (73.3 m/s) with Military power + afterburner.
  • Time to altitude : 20,000 ft (6,096 m) in 5.6 minutes. 30,000 ft (9,144 m) in 10.2 minutes.
  • Thrust/weight : 0.29.
  • Take-off run : in calm conditions 1,595 ft (486 m) with Military power + afterburner.
  • Powerplant : Two Westinghouse J46-WE-8B after-burning turbojet engines.
  • Thrust : 4,600 lbf (20 kN) thrust each dry, 6,000 lbf (27 kN) with afterburner.
  • Armament : Four 20mm M3 cannon above inlet ducts, 180 rpg. Hardpoints : 4 with a capacity of 5,500 lb (2,500 kg),with provisions to carry combinations of four AAM-N-2 Sparrow I air-to-air missiles.

— — — = = — — —

This text is available under the Creative Commons Attribution-ShareAlike License
Source : Article Vought F7U Cutlass of Wikipedia ( authors )
Vought F7U Cutlass : Your comments on this subject
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