Text: "Pneumatic propulsion system." Relates to a new and unique propulsion system that contains a source of compressed air housed within a tank. The propulsion system is adapted to selectively deliver the pressurized air from the tank to a turbine motor. The air drives the turbine motor and an associated output drive shaft. In addition, a driven vacuum pump system is communicatively connected to the turbine motor. The pump evacuates air from the turbine motor and then directs the evacuated air back to the tank to form a hermetically closed pneumatic circulatory air circuit system. U.S. Patent no. 4,251,992. Feb. 24, 1981.

See Also: pneumatic motor, free energy, patents.

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