MiG-25 "Foxbat" @·AIRCRAFTUBE

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Mikoyan-Gurevich MiG-25

The Mikoyan-Gurevich MiG-25 (NATO reporting name "Foxbat") is a very high-speed interceptor and reconnaissance-bomber aircraft designed by the Soviet Union's Mikoyan-Gurevich bureau. First flown as a prototype in 1964, it entered service in 1970. With a top speed of Mach 3.2, a powerful radar and four air-to-air missiles, the MiG-25 worried Western observers and prompted development of the F-15 Eagle.

The aircraft's true capabilities were not discovered until 1976 when Viktor Belenko, a Soviet MiG-25 pilot, defected to Japan. Subsequent analysis revealed a simple-yet-functional design with vacuum-tube electronics, two massive turbojet engines, and sparing use of advanced materials such as titanium. This allowed for a production run of 1,190 aircraft. The MiG-25 flew with a number of Soviet allies and former Soviet republics and it remains in limited service in Russia and several other nations.

The development of the MiG-25 began in the 1950s, paralleling American efforts to develop a Mach 3 bomber and interceptor aircraft, including the experimental North American XB-70 Valkyrie, the XF-103 Thunderwarrior, the Lockheed YF-12, and the XF-108 Rapier. With the first Mach 2 aircraft beginning to enter service, Mach 3 seemed like the next logical step. A variety of roles were considered, including cruise missile carriers, and even a small five to seven passenger supersonic transport, but the main impetus was a new high-altitude reconnaissance aircraft and heavy interceptor. If a Mach 3 bomber were to enter American service, it would have been nearly invulnerable to Soviet air defense.

The Mikoyan-Gurevich OKB accepted the assignment effective 10 March 1961. Although the XB-70 Valkyrie was cancelled before the new Soviet aircraft, which carried the bureau designation "Ye-155" (or "Е-155"), reached the prototype stage, it seemed that the Ye-155 would still be a useful addition to the PVO Strany air defense interceptor force for use against reconnaissance targets like the SR-71 Blackbird.

Because of the thermal stresses incurred in flight above Mach 2, the MiG-25 could not be constructed with traditional aluminum alloys. Lockheed had utilized titanium for their YF-12 and SR-71 series aircraft and North American used a honeycombed steel material for the XB-70. Both American companies struggled with the materials used to construct their respective aircraft. In the end, Mikoyan-Gurevich OKB constructed the MiG-25 largely from nickel alloy steel. The steel components of the MiG-25 were formed by a combination of spot-welding, automatic machine welding and hand arc welding methods. Initially there was concern that the metal welds would crack when the aircraft experienced the normal jolting of a landing. This did not prove to be the case, and any cracks that developed in service were easily welded in the field. A small amount of titanium and aluminum alloys were also used in the construction of the MiG-25, in areas particularly susceptible to high aerodynamic drag.

The first prototype, which was a reconnaissance variant, designated "Ye-155-R1" by the bureau, made its first flight on 6 March 1964. The prototype interceptor, "Ye-155-P1", took to the air on 9 September 1964. Development, which represented a major step forward in Soviet aerodynamics, engineering and metallurgy, took several more years to complete. In the meantime, several prototypes, under the cover designation "Ye-266" (or "Е-266"), made a series of record-setting flights in 1965, 1966, and 1967. Series production of the two initial variants, designated MiG-25P ('Foxbat-A') (interceptor) and MiG-25R ('Foxbat-B') (reconnaissance), began in 1969. The MiG-25R entered Soviet Air Force (VVS) service almost immediately, but the service entry of the MiG-25P with the PVO was delayed until 1972. A non-combat trainer variant was also developed for each version, the MiG-25PU ('Foxbat-C') and MiG-25RU, respectively. The MiG-25R evolved several subsequent derivatives, including the MiG-25RB reconnaissance-bomber, the MiG-25RBS and MiG-25RBSh with side-looking airborne radar (SLAR), the MiG-25RBK and MiG-25RBF ELINT aircraft ('Foxbat-D'), and the MiG-25BM ('Foxbat-F') SEAD variant, carrying four Raduga Kh-58 (NATO reporting name AS-11 'Kilter') anti-radiation missiles.

The MiG-25 was capable of high performance, including a maximum speed of Mach 3.2 and a ceiling of 90,000 ft (27,000 m), although on Aug. 31, 1977, an E-266M, a specially modified Foxbat, flown by MiG OKB Chief Test Pilot Alexander Fedotov, set the recognized absolute altitude record for a jet aircraft under its own power, reaching 123,523.58 ft (37,650 m) at Podmoskovnoye, USSR in a brief zoom climb. The record is the only recognized absolute record not held by a pilot from the United States. Although intended for intercepting or threatening high-altitude, high-speed aircraft the MiG-25's maneuverability, range, and close combat potential were extremely limited. Even its tremendous speed was problematic: although the available thrust was sufficient to reach Mach 3.2, a limit of Mach 2.8 had to be imposed to prevent supposed total destruction of the engines, though whether this was inevitable is disputed. Mach 2.5 and greater was difficult to reach without overspeeding the turbines.

Despite these limitations, inaccurate intelligence analysis and several false assumptions caused a panic in the West, where it was initially believed that the MiG-25 was actually an agile air-combat fighter rather than a stand-off interceptor. In response, the United States launched an ambitious new program, which resulted in the McDonnell-Douglas F-15 Eagle.

Design description

A true understanding of the strengths and failings of the MiG-25 by the West came in 1976. On 6 September, a PVO pilot, Lt. Viktor Belenko, defected to the West, landing his MiG-25P at Hakodate Airport in Japan. It was carefully dismantled and analyzed by the Foreign Technology Division (now the National Air and Space Intelligence Center) of the United States Air Force, at the Wright-Patterson Air Force Base near Dayton, Ohio. After 67 days, the aircraft was returned to the Soviets in pieces. The analysis showed some surprising facts:

  • Belenko's particular aircraft was brand new, representing the very latest Soviet technology.
  • The aircraft was assembled very quickly, and was essentially built around its massive Tumansky R-15(B) turbojets.
  • Welding was done by hand and construction was relatively crude. As in many Soviet aircraft, rivet heads were left exposed in areas that would not adversely affect aerodynamic drag.
  • The aircraft was built of a nickel-steel alloy and not titanium as was assumed (though some titanium was used in heat-critical areas). The steel construction contributed to the craft's massive 64,000 lb (29,000 kg) unarmed weight.
  • The majority of the on-board avionics were based on vacuum-tube technology, not solid-state electronics. Seemingly obsolete, the use of vacuum tubes were more tolerant of temperature extremes, thereby removing the need for providing complex environmental controls inside the avionics bays. In addition, the vacuum tubes were easy to replace in remote northern airfields where sophisticated transistor parts may not have been readily available. As with most Soviet aircraft, the MiG-25 was designed to be as rugged as possible. Also, the use of vacuum tubes makes the aircraft's systems more resistant to an electromagnetic pulse, for example after a nuclear blast.
  • Thanks to the use of vacuum tubes, the MiG-25P's original Smerch-A (Tornado, NATO reporting name 'Foxfire') radar had enormous power - about 600 kilowatts.
  • The airspeed indicator was redlined at Mach 2.8, with typical intercept speeds near Mach 2.5 in order to extend the service life of the engines. An Egyptian MiG-25 was tracked flying over Israel at Mach 3.2 in 1973, but the flight had resulted in the destruction of its engines.
  • Maximum acceleration (g-load) rating was just 2.2 g (21.6 m/s²) with full fuel tanks, with an absolute limit of 4.5 g (44.1 m/s²). One MiG-25 withstood an inadvertent 11.5 g (112.8 m/s²) pull during low-altitude dogfight training, but the resulting deformation wrote off the airframe.
  • Combat radius was 186 miles (300 km), and maximum range on internal fuel (at subsonic speeds) was only 744 miles (1,200 km). In fact, Belenko had only just made it to Japan without running out of fuel - without sufficient fuel for a carefully planned landing, he narrowly missed a commercial airliner taking off, and overran the available runway on landing.

    • Most MiG-25s used the KM-1 ejector seat; the last versions, though, used an early variant of the K-36 seat. The speed record for a successful ejection (Mach 2.67) is held by a KM-1-equipped MiG-25.

    As the result of Belenko's defection and the compromise of the MiG-25P's radar and missile systems, beginning in 1978 the Soviets developed an advanced version, the MiG-25PD ('Foxbat-E'), with a new RP-25 Saphir look-down/shoot-down radar, infrared search and track (IRST) system, and more powerful engines. About 370 earlier MiG-25Ps were converted to this standard and redesignated MiG-25PDS.

    About 1,186 MiG-25s were produced before production ended in 1984, and the type was exported to Algeria, Bulgaria (3 MiG-25R and 1 MiG-25RU until 1992), India (until 2006), Iraq, Libya, and Syria.

    Operational service

    Before entering operational service, four MiG-25Rs were temporarily in service with Egyptian Air Force in 1971 under the cover designation of "X-500". All four had EAF markings. They flew over Israel in pairs roughly 20 times. In 1973, an Egyptian MiG-25s was clocked at Mach 3.2 while it was being chased by Israeli F-4Es. The Israeli Air Force found it impossible to intercept them, even though Israeli intelligence generally knew when the overflights were scheduled. The MiG-25Rs went back home in 1972, though reconnaissance Foxbats were sent back to Egypt in October 1973, after the Yom Kippur War, and remained there into 1974. The Israeli Air Force did not have the capability to intercept MiG-25s until it received the F-15 Eagle.

    The Israelis shot down two Syrian MiG-25s in 1981. Another Syrian MiG-25 was shot down by an Israeli HAWK SAM (surface-to-air missile) in 1982, however this kill was widely denied by Russian sources; the vast majority of Russian sources only acknowledge the 1981 MiG-25 losses.

    The MiG-25 was in service with the Iraqi Air Force during the Iran-Iraq War, but its combat record is unclear. Many sources claim a few MiG-25Rs were shot down and some Russian sources support this claim, however they add that some Iranian aircraft were shot down by MiG-25s.

    In another incident, an Iraqi MiG-25PD, after eluding eight USAF F-15s, fired three missiles at EF-111 Raven electronic warfare aircraft, forcing them to abort their mission. This may have led to the later loss of an F-15 to surface-to-air missiles, due to the lack of electronic jamming.

    In yet another incident, two MiG-25s approached a pair of F-15s, fired missiles (which were evaded by the F-15s), and then outran the American fighters. Two more F-15s joined the pursuit, and a total of ten air-to-air missiles were fired at the MiG-25s, though none reached them. According to the same sources, at least one F-111 was also forced to abort its mission by a MiG-25 on the first 24 hours of hostilities, during an air raid over Tikrit.

    Two MiG-25s were shot down by U.S. Air Force F-15Cs during the Gulf War. After the war, in 1992, a U.S. F-16 downed a MiG-25 that violated the no-fly zone in southern Iraq.

    In May 1997 an Indian Air Force MiG-25RB was detected flying faster than Mach 3 at at least 65,000ft, over Pakistani territory. Reportedly this was a deliberate attempt by the Indian Air Force to demonstrate that the capabilities of the MiG-25 are unmatched by the Pakistani air force.

    On December 23, 2002, an Iraqi MiG-25 shot down a U.S. Air Force unmanned MQ-1 Predator drone, which was performing armed reconnaissance over Iraq. This was the first time in history that an aircraft and an unmanned drone had engaged in combat. Predators had been armed with AIM-92 Stinger air-to-air missiles, and were being used to "bait" Iraqi fighter planes, then run. In this incident, the Predator did not run, but instead fired one of the Stingers, which missed, while the MiG's missile did not.

    No Iraqi aircraft were used in the 2003 invasion, with most hidden or destroyed on the ground. In August 2003, several dozen Iraqi aircraft were discovered buried in the sand. That included two MiG-25s which were excavated and sent to WPAFB's Foreign Technology Division using a C-5B Galaxy.

    Current Operators

    • Algeria: 11 remained operational with the Algerian Air Force, including 5 MiG-25A, 3 MiG-25PD, and 3 MiG-25R models.
    • Armenia: 1 was maintained operational.
    • Azerbaijan Air Force : received eight MiG-25PDs, 14 MiG-25RBs and six MiG-25 trainers.[6] Five of these aircraft were in use in November 2008.
    • Russia: 70 remained in service with the Russian Air Force. They are a mix of 30 MiG-25 fighters and 40 MiG-25RB Recon.
    • Syria: 11 remained in service, including 2 MiG-25R and a MiG-25U with the Syrian Air Force.
    • Turkmenistan : 24 (MiG-25PD/MiG-25PUs) in inventory as of November 2008.

    Former Operators

    • Egypt: Four MiG-25R prototypes from the USSR were temporarily inducted into service with the Egyptian Air Force in 1972 and then returned on 1974 to Soviet Union.
    • Bulgaria: Three MiG-25RBT and one MiG-25RU were delivered in 1982. On April 12 1984 #736 crashed near Balchik. The pilot ejected successfully. They were operated by 26th RAB at Dobrich until their withdrawal. In May 1991, the surviving MiG-25s were returned to the USSR in exchange for five MiG-23MLD.
    • Azerbaijan: As many as 20 operated in the past, all retired from service.
    • India: Retired from service in July 2006.
    • Iraq.
    • Georgia.
    • Kazakhstan.
    • Libya.
    • Soviet Union: The largest operator historically, Soviet aircraft were passed on to its successor states in 1991.
    • Turkmenistan.
    • Ukraine: Withdrawn from service.

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    This text is available under the Creative Commons Attribution-ShareAlike License
    Source : Article Mikoyan-Gurevich MiG-25 of Wikipedia ( authors )

    Specifications (MiG-25P 'Foxbat-A')

    • Crew : One.
    • Length : 19.75 m (or 64 ft 10 in).
    • Height : 6.10 m (or 20 ft).
    • Wingspan : 14 m (or 45 ft 11 in).
    • Wing area : 61.40 m² (or 661 ft²).
    • Wing loading : 598 kg/m² (or 122.5 lb/m²).
    • Empty weight : 20,000 kg (or 44,080 lb).
    • Loaded weight : 36,720 kg (or 80,952 lb).
    • Maximum speed : Mach 3.2 (or 3,645 km/h or 2,385 mph).
    • Range : 1,730 km (or 1,075 mi) with internal fuel.
    • Service ceiling : 20,700 m (with 4 missiles) (or 67,915 ft).
    • Thrust/weight : 0.41.
    • Time to altitude : 8.9 min to 20,000 m (or 65,600 ft).
    • Powerplant : Two Tumansky R-15B-300 afterburning turbojets.
    • Dry thrust : 73.5 kN (or 16,524 lbf) each.
    • Thrust with afterburner : 100 kN (or 22,494 lbf) each.
    • Armament : Two radar-guided R-40R (AA-6 'Acrid') air-to-air missiles, and two infrared-guided R-40T missiles
    • Avionics. RP-25 Smerch radar. A RV-UM or a RV-4 radar altimeter.

    — — — = = — — —

    This text is available under the Creative Commons Attribution-ShareAlike License
    Source : Article Mikoyan-Gurevich MiG-25 of Wikipedia ( authors )
    Mikoyan-Gourevitch MiG-25 "Foxbat" : Your comments on this subject
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