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Re: the jet propulsion with closed combustion type
i think they already use what you are talking about, they call it a rocket engine
if that's what you're talking about.
the other engine you could be talking about is the german, so called because of the sound it males, buzz bomb engine that was used in WW2
i'm thinking jet engines are about as efficient as they can get, sure the compresser fan is heavy but it is doing two fuctions. it is compressing and acting as a propeller.
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