SR-71 Blackbird Designed to Leak Fuel?
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You may have heard the myth that the SR-71 was "designed to leak fuel".
Well here's interesting fact about the A-12 Archangel, the CIA's predecessor to the SR-71:
In 2012 the CIA Chief Historian David Robarge wrote a book for the CIA titled 'Archangel: CIA's Supersonic A-12 Reconnaissance Aircraft'
Within the book on page 12 David mentions the following interesting tidbit:
"No sealant for the fuel tanks was ever developed that was simultaneously impervious to chemical
effects caused by the fuel, and elastic enough to expand and contract as the tanks heated and cooled and were subjected to large pressure changes.
Consequently the A-12’s tanks leaked, a quirk that was not detected until the first aircraft was delivered to the test site and filled with fuel, setting off a reaction that broke down the sealants.
A “leak rate” of between five and 60 drops per minute, depending on the source, was considered acceptable."
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