Abstract: A lightweight rotary engine of novel design having a sealed inner portion that allows the engine to assume any attitude during operation. The bottommost portion of each piston contains a bearing roller that is urged against a fixed eccentric post which causes rotation of the rotor assembly. There is no direct connection between the bottommost portion of the pistons and the eccentric post.The rotor consists of a pair of opposed plates for moving the cylinders in a radial direction. The space between the cylinders contains air chambers for holding air under pressure that is used to scavenge the cylinders.

Abstract: A rotary internal combustion engine is described and shown having two piston and cylinder assemblies rotating about a single axis. The pistons reciprocate in rotating cylinders having a four cycle internal combustion engine process to receive air and fuel, to compress the air and fuel, to combust the mixture and to exhaust the gases therefrom. The pistons move in a set relation to each other, being connected by a common rod. The center of rotation of the pistons is dynamic relative to the center of rotation of the cylinders and cylinder blocks. Intake and exhaust valves are positioned about the periphery of the rotor assembly, and have staggered opening and closing schedules in order that air and fuel may be admitted and gases scavenged in accordance with the four cycle internal combustion engine principle.