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A fourth YF-12 aircraft, the "YF-12C", was actually the second SR-71A (AF Ser. No. 61–7951). This SR-71A was re-designated as a YF-12C and given the fictitious Air Force Serial Number 60-6937 from an A-12 to maintain SR-71 secrecy. The aircraft was loaned to NASA for propulsion testing after the loss of YF-12A (AF Ser. No. 60–6936) in 1971.
The YF-12 program was a limited production variant of the A-12. Lockheed convinced the U.S. Air Force that an aircraft based on the A-12 would provide a less costly alternative to the recently canceled North American Aviation XF-108, since much of the design and development work on the YF-12 had already been done and paid for. Thus, in 1960 the ...
In the US Air Force the naming convention for fighter aircraft is a prefix "F-", followed by a number, ground attack aircraft are prefixed with “A-” and bombers with “B-”. Fighter aircraft from the second world war onwards are sorted into generations, from 1 to 5, based on technological level. [1] [2] An American F-16 fighter jet
List of United States Air Force aircraft designations (1919–1962) List of United States Navy aircraft designations (pre-1962) List of United States Army aircraft designations (1956–1962) List of United States Tri-Service aircraft designations; List of U.S. DoD aircraft designations; List of undesignated military aircraft of the United States
The Pratt & Whitney J58 (company designation JT11D-20) is an American jet engine that powered the Lockheed A-12, and subsequently the YF-12 and the SR-71 aircraft. It was an afterburning turbojet engine with a unique compressor bleed to the afterburner that gave increased thrust at high speeds.
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NASA_YF-12_Overview.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 26 min 38 s, 604 × 360 pixels, 482 kbps overall, file size: 91.75 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
The United States department of Defense was established in 1949, the old name Department of War was retired in 1947. In 1962 separate aircraft naming schemes were unified, but out of convenience many numbers carried over. For example, the P-38 Lightning, which also was used as the F-4 and F-5 for reconnaissance and FO in the Navy, became the F-38.