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Originally Posted by LoBlo
Come to think of it though, I do remember hearing that the SR-71 used liquid hydrogen as its fuel source (becuase its combustion properties were desirable at Mach3), but is hampered by its low density, a cubic meter of liquid H2 only holds 70kg of fuel iirc.
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While it woulf be possible to use hydrogen, the SR-71 used JP-7, a high flash point hydrocarbon fuel developed for high temperature use. Also used as coolant and hydraulic fluid.
http://en.wikipedia.org/wiki/JP-7