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Project Isinglass
Project Isinglass was the code name given to two heavily classified, manned reconnaissance aircraft studied by the Central Intelligence Agency (CIA) as potential replacements for the Lockheed A-12 and SR-71 during the mid 1960s. The first proposal under the Isinglass name, a high-altitude plane to fly at Mach 4 to 5, was considered an insufficient advancement over existing aircraft; the second, much more advanced design, sometimes referred to as Project Rheinberry,〔Richelson 2001, p.100.〕 was an air-launched, Mach 20 rocket-powered boost-glide aircraft that would use a very-high-altitude trajectory to avoid defenses. This aircraft was considered too costly for development, and the project was abandoned in 1967.
==Origins==
Project Isinglass was developed as a result of the vulnerability of existing manned reconnaissance aircraft, such as the Lockheed U-2 and the Lockheed A-12, to Soviet air defenses in the early 1960s, catalysed by the shooting down in May 1960 of Francis Gary Powers.〔Day 2010〕 Although there were continuing plans to overfly the Soviet Union with the A-12 – referred to by the CIA as Project Oxcart〔Rich 1994, p.201〕 – these failed to come to pass,〔 and the CIA began plans for an aircraft with superior performance to replace Oxcart.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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