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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 ...
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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.
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
Lockheed's initial concept was a particularly large aircraft called CL-2016, nicknamed "battlecruiser" for its size, that resembled its SR-71/YF-12 with large delta wings and engines mounted in nacelles spaced away from the fuselage and would have had similarly high operating speed and altitude as a missile platform (or "missileer" per Lockheed).
Hughes Aircraft would continue the development of the advanced fire control system and the GAR-9 missile. [N 1] Development of the F-108 radar and missiles was continued by the USAF and the system was eventually used in the Lockheed YF-12 program. [14]
The aircraft was not repaired, and was scrapped in situ. [51] On 3 January 2020, a Y-12-II of the Sri Lankan Air Force crashed to Haputale, Sri Lanka, while on aerial observations, killing all 4 airmen. [52] On 4 August 2020, a Y-12-II of the Kenyan Air Force resupplying AMISOM crashed after taking off from Dhobley Airstrip in Somalia. All 10 ...