The MiG-25 Foxbat was a supersonic interceptor built by the Soviet Union in the 1970s. This aircraft was designed to protect Soviet airspace from high-altitude NATO reconnaissance aircraft and bombers.
It gained notoriety for its high-performance engines, which could propel it to speeds exceeding Mach 2.5, and for its relatively advanced radar for its time. The Foxbat has since been the target of many myths and misconceptions, most of which stemmed from the Cold War, when NATO knew very little about the aircraft. The U.S. assumed that the MiG-25 was a highly maneuverable, all-weather, multi-role aircraft.
MiG-25. Image Credit: Creative Commons.
MiG-25 Foxbat. Image Credit: Creative Commons.
When the West finally got its hands on the aircraft, it was disappointed to find out that it was, in reality, just an interceptor.
MiG-25: Developing a New Interceptor
The 1950s and 60s was a constant tug-of-war match between air defense systems and jet aircraft, and at the time, aircraft seemed to be winning. Aircraft like the Lockheed U-2 spy plane could fly freely over the USSR, higher than the missile systems and interceptors of the time could reach.
Supersonic aircraft like the B-58 Hustler and the B-70 Valkyrie (then in development), and the SR-72 could outrun certain missile systems and posed a strategic threat to the USSR. The Soviets, therefore, began developing a new interceptor, one that could effectively protect the country’s vast airspace while new missile systems were being developed.
The Mikoyan-Gurevich Design Bureau was tasked with designing the new interceptor. Several possible designs were considered, including one that placed the engines side by side, as seen on the MiG-19, but these were rejected.
MiG finally settled with the Ye-155R3 prototype, the aircraft that eventually became the MiG-25. Recognizing the potential of this design, the bureau reduced the aircraft’s weight to maximize its top speed.
During its test flights, the aircraft set several flight records, some of which still stand today. Full-scale production of the MiG-25 began in 1969, and the aircraft officially entered service in 1970.
The Rugged Engineering on the MiG-25
The MiG-25’s airframe was constructed using stainless steel, along with nickel-steel, aluminum, and titanium.
MiG had originally wanted to use more titanium for the wings and fuselage, but the material proved too difficult to work with.
Due to the thermal stress of supersonic flight, stainless steel was a better, cheaper option for the Soviets.
This was a practical, albeit inelegant, solution that improved the aircraft’s performance at high speeds.
MiG-25 Foxbat Fighter. Image Credit: Creative Commons.
The aircraft uses a slightly swept-wing configuration, which enables it to reach high speeds but at the cost of maneuverability.
The MiG-25 is powered by two massive Tumansky R-15B-300 engines, each capable of producing around 7,500 kilograms of thrust.
This allowed the aircraft to fly at Mach 2.83 for 1,000 nautical miles without refueling. On paper, the MiG-25 could exceed Mach 3, but in practice, doing so was dangerous and could cause significant engine damage. A Mach 2.8 speed limit was imposed on the aircraft to reduce maintenance costs.
The aircraft also had a service ceiling of 67,000 to 78,000 feet, depending on its load, enabling it to intercept high-altitude bombers and reconnaissance aircraft effectively.
Avionics and Weaponry of MiG-25
The avionics on the MiG-25 were not bad for their time, but they weren’t that impressive either.
It was initially equipped with the TL-25 Smerch-A radar, which was originally developed for the Tu-128 Fiddler. The system was designed to track fast, high-flying aircraft, but it lacked look-down/shoot-down capabilities, making low-flying aircraft more likely to slip past the MiG-25 undetected.
This radar was later replaced by the much more capable RP-23 Saphir radar, which increased its tracking range and improved its performance against low-flying aircraft.
For weaponry, the MiG-25 was armed with four R-40 long-range air-to-air missiles, each fitted with a semi-active radar homing system and capable of engaging targets at ranges of 35-60 kilometers.
The aircraft could also be used to carry bombs if, for some reason, the interceptor needed to perform conventional strike missions. This armament made the MiG-25 a formidable opponent for the time.
Although it could not carry a wider range of weapons, the Soviets were content to leave those missions to other specialized aircraft, with the Foxbat acting primarily as a dedicated interceptor.
The West’s (Over)reaction to the MiG-25
The reveal of the MiG-25 was a shock to the West, particularly to U.S. intelligence agencies, which believed the aircraft was a new supersonic multi-role fighter. When Soviet pilot Viktor Belenko defected and flew a MiG-25 to Japan, the U.S. was disappointed to learn that its perceptions of the aircraft were wrong.
The Foxbat was constructed from cheap stainless steel and with simple manufacturing techniques.
At the time, the U.S. had been developing its F-X program, which would later become the F-15 Eagle.
Image Credit: US Air Force.
The F-15EX, the Air Force’s newest fighter aircraft, arrives to Eglin Air Force Base, Florida March 11. The aircraft will be the first Air Force aircraft to be tested and fielded from beginning to end through combined developmental and operational tests. The 40th Flight Test Squadron and the 85th Test and Evaluation Squadron personnel are responsible for testing the aircraft. (U.S. Air Force photo/Samuel King Jr.)
When the MiG-25 was first revealed, it was thought that the F-15 had been outclassed before it was even completed, leading the U.S. to significantly alter the aircraft during its development. When the U.S. actually saw the aircraft up close, it became abundantly clear that these fears were unfounded.
The Soviets were understandably frustrated when the MiG-25 was handed over to the West, not because it was revealed to be a paper tiger; in fact, the USSR never claimed the aircraft to be anything but a dedicated interceptor, contrary to popular belief.
Rather, the MiG-25 contained sensitive avionics, which helped the West to gain a better understanding of the Soviets’ air defense network and technical structure.
As a result, a new variant of the MiG-25, the MiG-25PD, was developed, featuring a completely new avionics suite and a much more capable radar.
The aircraft remained in production until 1984, when it was replaced by its much more capable sibling, the MiG-31.
About the Author: Isaac Seitz
Isaac Seitz, a Defense Columnist, graduated from Patrick Henry College’s Strategic Intelligence and National Security program. He has also studied Russian at Middlebury Language Schools and has worked as an intelligence Analyst in the private sector.
