>> While not quite military my question is vehicle oriented. Does anybody
>> know anything about the performance of vehicles that run on compressed
>> natural gas.
>> My friend is looking at a van powered by this gas. I imagine they are
>> less polluting but do they have any power? Any other info would be
>> helpful........Alan
>
> By compressed natural gas I think you mean propane and under several
> hundreds of psi this actually liquefies at ambient temperature. Propane
> is normally used since other acceptable gasses, butane for instance, will
> self freeze when required to evaporate at an engine demand rate.
No, that's wrong. Compressed natural gas (CNG) is not propane!
Propane is LPG. CNG is the gas which comes out of the earth and to
your home through pipes (if you have a gas stove or a gas heater at home).
In Germany we call it "Erdgas". This gas can be compressed to around
300 bar (4500 psi) and put into high pressure gas tanks to power a vehicle.
Many busses made by MAN here are powered by CNG. The big high pressure gas
bottles are on the roof of the bus.
Best regards
Andreas
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