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Yea, engines tend to be a bit heavy. I doubt they will ever have a really small power-plant that can make enough power to be really practical. The biggest issue as always is all the heat the the laws of physics say will be produced to make power. I heard someone say that the power module that The Terminator had was going to require a radiator the size of a train. And the Terminator had redundant power modules.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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