Abstract: A hinge valved rotary engine has separate compression and expansion chambers with respective smooth surfaced compression and expansion rotors mounted therein on a common engine shaft. The chambers are connected by a combustor unit which receives compressed air from the compression chamber, mixes fuel with the air, and ignites the mixture for communication to the expansion rotor to turn the shaft. Air is compressed by cooperation of a hinged compression valve which sealingly engages the compression rotor. A combustion valve is forced into sealing engagement with the expansion rotor by the pressure of the combustion gases such that the pressurized combustion gases force lobes of the expansion rotor to rotate. A tangentially vaned compressed air control valve in the combustion unit controls the timing of the release of the compressed air into the combustor unit.

Abstract: A rotary internal combustion engine which includes a lobed combustion rotor and a similar compression rotor on a common shaft and firing chambers external to the combustion and compression cavities. The compression rotor compresses excess amounts of air during normal operation which is stored in a tank. During operation, the rotational speed of the engine shaft and the position of an accelerator are sensed. The engine may be run in a non-idle mode by inhibiting the flow of fuel and air to the firing chambers and inhibiting the spark plugs when an idle speed accelerator position and an idle engine speed are sensed, to shut down the engine. When the accelerator is afterwards pressed, the engine is restarted by valving stored compressed air to the combustion cavity to cause the combustion rotor to turn.