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Old 16th Mar 2013, 05:12
  #1000 (permalink)  
Join Date: Feb 2013
Location: Placerville, CA
Posts: 71
The NERVA engine, never operational, used only liquid hydrogen for fuel, but it was a nuclear reactor.
I know what you mean, but the NERVA used hydrogen for reaction mass only, not fuel. The lighter the molecules you throw backward the more thrust you get for the same power. It was not a fusion reactor.
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