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It is alleged that the scarcity of titanium alloy in the Soviet Union at that time meant that there was only enough titanium for the M-12 and that Mikoyan were forced to use stainless steel in their contemporary MiG-25. Tumansky quickly scaled-up the R-15-300 to produce the R-25-500 'Saturn' engine two of which powered the M-12. What is undeniable, however, was the fast progress of this urgent Soviet programme which saw the prototype M-12 first fly in February 1964 barely a year after the first flight of the A-12 and apart from the flying start given by clandestine means Myasishchev were also assisted by Tumansky's work on the R-15-300 engine originally designed for the Tupolev Tu-123 Yastreb drone and later modified for the use in the Ye-155 (MiG-25). The Myasishchev M-12 project started in late 1960 and is believed to have been helped by a Soviet sleeper cell working within 'Project Archangel' and although this was refuted by both the CIA and Lockheed the heavily reported 'cyanide suicides' of two separate Burbank couples on the night of April 25th, 1963 is believed to have linked to the uncovering of a Soviet sleeper cell. One was for a new interceptor allocated to the Mikoyan Design Bureau (which would eventually see service as the MiG-25 'Foxbat') whilst the other was for a clandestine copy of the proposed A-12 allocated to the Myasishchev Design Bureau and to be made in both interceptor and reconnaissance versions. Faced with two Mach 3 aircraft penetrating Soviet air defences (and a Mach 3 interceptor defending the USA) the Soviet Air Force secretly announced two urgent counter programmes. Myasishchev M-12 - Protivo Vozdushnaya Oborona Strany, 1971ĭuring early 1959 Soviet intelligence reported back to the Kremlin disturbing news on the rapid progress of two of the United States top aerospace programmes, the B-70 and the A-12 (forerunner of the SR-71) followed by news that proposals were being made for a follow-on interceptor based on the A-12.
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