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22 December 1964: First flight of the SR-71 with Lockheed test pilot Bob Gilliland at AF Plant #42. First mated flight of the MD-21 with Lockheed test pilot Bill Park at Groom Lake. 28 December 1966: Decision to terminate A-12 program by June 1968. 31 May 1967: A-12s conduct Black Shield operations out of Kadena; 3 November 1967: A-12 and SR-71 ...
As the SR-71 had a second cockpit behind the pilot for the RSO, it could not carry the A-12's principal sensor, a single large-focal-length optical camera that sat in the "Q-Bay" behind the A-12's single cockpit. Instead, the SR-71's camera systems could be located either in the fuselage chines or the removable nose/chine section.
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.
Lockheed's was designated the A-12, and was a variation of their A-11 design. President Eisenhower was briefed on 20 July and he approved moving ahead with a final decision. On 20 August, the companies presented their final designs for Kingfish and the A-12. Lockheed's design was estimated to have longer range, higher altitude and lower cost. [5]
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.
Despite the similarities in the core models (SR-71/A-12) the SR-71 is not the A-12, and the A-12 was canceled in lieu of the SR-71. These articles shouldn't be combined. A stronger case can be made for merging the YF-12 and M-21/D-21 articles into/with the A-12 article, as they are variants of the A-12.
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The article does not explain what the technical differences are between the A-12 and the SR-71.--Arado 11:00, 29 September 2008 (UTC) Good point. The SR-71 added a 2nd seat to the cockpit and is slightly larger. Info has been added to the Development section. -Fnlayson 14:00, 29 September 2008 (UTC)