The rotary internal combustion engine is a rotary internal combustion engine that uses the unique combination of multiple rotors on a vertical axis with piston vanes, which are intersected by horizontally oriented valve rings so that rotating rotors intersect gaps on the rotating valve rings, thus creating the intake compression and power and exhaust cycles on this internal combustion engine. The unique design allows the motor to operation as either a motor or pump. High volume of compressed air virtually eliminates the need for a storage tank. These engines are an elegant solution that fulfills the century long quest for quiet, clean, highly efficient rotary power. When available, the demand for the benefits of rotary piston power in air, surface, and marine applications, will be immediate and rewarding.