I find it a little hard to believe, but perhaps it's not impossible. The problem with "light weight" fuel would be the fact that it is unlikely that it could carry the same energy-per-volume or energy-per-mass as other fuels...for instance...ethanol is lighter than methanol and both are lighter than gasoline...but in order to get the same amount of energy during combustion of those alcohols as one would get in a regular gas engine, one has to burn quite a lot more fuel by volume.
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me-- "Sometimes you feel like a nut, sometimes you don't. Sometimes I feel like the moon is made of cheese"
my Hindibonics-speaking Indian roommate--"Dawgs, do you have any idea how much bacteria that would take?"
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