It seems like you can power pretty much anything on natural gas or propane, why not jet engines or at least prop planes? Is it a weight issue?
In: 1
Space and weight.
Planes typically carry fuel in wing tanks, the skin of the wings is actually the tank.
CNG must be stored in heavy pressure tanks. Not only would the tanks be hugely more heavy, but they would take up far more space since they have to be round in order to hold the pressure.
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