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I read somewhere that they were working on a air engine made from carbon fiber So they could keep the weight down. Being that it was using air to propell the vehicle they were stating that it could be done without too much trouble.
What they could do to heat the cylinders is to have water channels in the block and just run the water through to keep the cylinders from freezin, by keeping them above a certain temperature it will keep them from freezing.
I believe the specs for the air vehicle I saw was about 3500 cubic feet compressed to 890 psi and could go between 150 and 250 mpg. The engine was a one liter three cylinder with really high gearing to utilize the high low end torque an air engine has. If these vehicles really work then they would be worth the price in the end.
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