Patent ID: 7117663

Claim:
A dual-acting rotary piston engine for powering a means to compress the air entering a jet aircraft engine, comprising: a) a rotary engine housing, said housing having two sides, b) a crankshaft mounted for rotation within said housing, c) a rotary piston mounted for rotation on said crankshaft, d) two expansion chambers defined between the interior surfaces of said housing and the exterior surfaces of said rotary piston, e) intake valve means mounted near the periphery of said housing, said intake valve means being ductingly connected to each of said expansion chambers, f) two outlet ports disposed in one side of said housing, each of said expansion chambers having one of said outlet ports attached thereto, g) outlet pipes attached to said outlet ports during operation, one end of each of said pipes attached to one of said outlet ports, the other end of each of said pipes remaining open at all times during operation, all of said pipes having substantially the same optimal length, and strong acoustic pulses which exit said outlet ports during operation, said pulses traversing from said outlet ports to said open ends where they are reflected back to said outlet ports as rarefactions, whereby during operation timely opening of said intake valves inducts pressurized hydrogen gas to into said expansion chambers for expansion therein until said outlet ports open, whereby said reflected rarefactions exist at said outlet ports for a substantial portion of the time that said outlet ports are open, whereby expanding hydrogen produces useful power before being burned as fuel, and whereby power produced by said crankshaft supplies power to said means to compress the air entering a jet aircraft engine.