The MiG-25 (NATO reporting name Foxbat) was an interceptor produced by the Soviet Union's Mikoyan-Gurevich design bureau in the 1960s. The aircraft, armed solely with AA-6 Air-to-air missiles, was designed to meet the threat of the American XB-70 Valkyrie Mach 3 bomber, and therefore has better speed and altitude performance than any other fighter aircraft, with a maximum speed of Mach 3.2 and a ceiling of 90,000 ft (27,000 m). However, the MiG-25, built for sheer speed, is inferior to almost all other jet fighters in maneuverability, and was therefore somewhat redundant as an interceptor following the XB-70's cancellation. In addition, the aircraft in service had to be limited to Mach 2.8, as higher speeds than this tended to overheat and wreck the engines.

Despite its limitations, a false appreciation of its abilities caused NATO to develop new designs to counter this perception. A combination of poor information gathering (including misidentifying the radar traces of several ballistic missiles being test fired as Foxbats being put through their paces) and poor extrapolation led to NATO's belief that the Foxbat was a long-range, high-maneuverability fighter-interceptor. While the information on speed, altitude and radar was reasonably accurate, the rest of the assessment was not, and it led to the perception of the Foxbat as a "boogeyman", a plane that far exceeded the capabilities of NATO's. This perception led to the creation of several extremely advanced fighters, designed to counter the perceived threat. Among these planes were the McDonnell-Douglas F-15 Eagle, the Grumman F-14 Tomcat and, less directly, the Dassault Mirage 2000. Thus, despite its own inadequacies, the Foxbat secured its place in aviation history by spurring on these advances.

Many former Soviet client states use an unarmed version of the MiG-25 as a reconnaissance aircraft. Last versions of the MiG-25BM served as Wild Weasel radar-killing planes in the Soviet Air Force. The MiG-25 was followed by the more advanced two-seater MiG-31 in the heavy interceptor role.

In an intelligence coup for the west, on September 6th, 1976, a PVO Strany MiG-25 Foxbat flown by Lt. Viktor Belenko landed at Hakodate airport, Japan. Belenko was defecting to the west and gave them the first in-depth look at the aircraft. It was carefully dismantled and analysed by the Foreign Technology Division of the USAF, at Dayton, Ohio. After 67 days the aircraft was returned to the Russians in pieces. The analysis showed some surprising facts:

• The particular aircraft was brand new, representing the very latest Soviet technology.
• The aircraft was built very quickly, and was essentialy built around its massive Tumansky turbofans.
• The majority of the on-board avionics was based on vacuum tube technology, not transistors. Some have speculated that this was not in fact inferior technology, but a deliberate approach by the Soviets to build a system much less prone to the effects of EMP during a nuclear explosion. Vacuum tubes are up to 1000 times more able to withstand EMP than solid-state electronics. Vacuum tubes also provide very massive power, making jamming meaningless. The original radar in the MiG-25 could output 500 kW (large land-mobile air defense radars of the 1960's had pulses worth about 1 MW). Tube cooling was facilitated by boiling off vodka (pure alcohol).
• Welding was done by hand.
• Construction was relatively crude, with exposed rivet heads in areas that were unimportant for good drag performance. This is normal for any soviet aircraft, the same is true for the contemporary MiG-29.
• The airspeed indicator was redlined at Mach 2.8, and pilots were required not to exceed Mach 2.5. The Americans had witnessed a MiG-25 flying at Mach 3.2 over Israel in 1973, a flight that had resulted in the total destruction of its engines. The Americans were unaware of the inevitability of the destruction, which helped to fuel the myths about the aircraft's capabilities.
• Combat radius was 186 miles (300 km), and without afterburner, straight line range 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-25 used the KM-1 seat, the last versions used an early variant of the famous K-36 seats. The speed record for fastest successful ejection at 2.67 Mach is held by a KM-1 equipped MiG-25).
• Maximum acceleration (G-load) rating was just 2.2 G (22 m/s²) with full fuel tanks, with an absolute limit of 5 G (49 m/s²). This was significantly poorer performance than the previous generation F-4 Phantom. This is still better than the SR-71, which had near infinite turning radius at top speed. One MiG-25 withstood inadvertent 11.5 G (113 m/s²)pull during low-altitude dogfight training, but the airframe had to be written off due to deformation.
• The aircraft was built of steel alloy and not titanium as supposed. Some titanium was used in heat-critical areas. The steel construction contributed to its massive 64,000 lb (29 t) unarmed weight.
• While built to counter the threat of the XB-70, its performance was such that it was unable to effectively intercept the Lockheed SR-71 - it had neither the range, speed nor altitude capability to do so. However, the not yet broken FAI altitude record for manned air-breathing planes is 37,625 meters, set by soviet test pilot A. Fedotov in an E-266M (a prototype version of the MiG-25). The SR-71 is unable to return from altitudes in excess of 30,000 meters, because aerodynamic nose pitch-up would occur, breaking the airframe up mid-air.

External link

• MiG-25 FOXBAT

Related content
Related Development	Mikoyan-Gurevich MiG-31
Similar Aircraft	F-15 Eagle -
Designation Series	MiG-19 - MiG-21 - MiG-23 - MiG-25 - MiG-27 - MiG-29 - MiG-31
Related Lists	List of military aircraft of the Soviet Union and the CIS - List of fighter aircraft

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