Patent ID: 7458201

Claim:
A propulsion device comprising: an outer housing having a substantially straight section and two curved ends disposed on either side thereof; an inner housing having a substantially straight section and two curved ends disposed on either side thereof, the inner housing being disposed within and spaced apart from the outer shell to form a plenum containing a gaseous working mass, the inner housing including a return duct connecting the plenum regions formed between the inner housing and the outer housing at the two curved ends thereby forming a sealed plenum between the inner housing and the outer housing, wherein the sealed plenum in the straight section includes a substantially unobstructed duct between the inner housing and the outer housing; and a working mass driver disposed within the plenum for recirculating the gaseous working mass through the plenum, wherein recirculation of the gaseous working mass through the plenum produces a net force in a predetermined direction acting upon the propulsion device.