Comments by "David Himmelsbach" (@davidhimmelsbach557) on "The SR-72 Is Probably Already Flying and Here’s Why" video.

  1.  @loganskiwyse7823  The fuel is based on BORON. Not kerosene. VERY expensive. USSR never had it.
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  2. Heh. LOL.
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  3.  @FiXaMuS  Top end was Mach 4.5. This is due to the energy in the fuel.
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