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A Lockheed design from the 1950's, this huge but very light aircraft was intended as a replacement for the U-2. The Lockheed designation was CL-400, codename Suntan. Intended to fly at Mach 2.5, it was to be powered by 2 Pratt & Whitney hydrogen burning Air-Turbo-Ramjet (ATR) engines. A completely new facility was built in the Florida Everglades to build and test the engines. Cancelled in 1958 due to technical difficulties when 4 prototypes had been completed. After cancellation of this USAF project, it was replaced by a CIA project codenamed "Gusto". Lockheed was selected to build it in September 1959, when it was renamed "Oxcart", which became the A-12 or SR-71 Blackbird.
It is believed that data and experience gained during the development of the engines and handling of cryogenic fuels may have been incorporated into the Aurora project.
As to the secrecy of Black projects - not a word of Suntan's existence leaked out for over twenty years...
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