Abstract: A Hybrid Piston/Rotary engine has a stationary elliptical housing with a circumscribed inner cam surface to provide thrust, and sides with bearing supports for rotation of a rotor, at least one cylinder, a shaft with apertures therein to provide rotary valves combined with intake and exhaust ports within the bearing supports. Each cylinder has two opposed pistons connecting cam followers pivoted to the rotor which reciprocate upon rotation. During the intake stroke, the pistons separate as an intake valve opens; and fuel mixture fills the cylinder and closes as pistons compress the mixture. The rotor ports become aligned with the spark plugs within the bearing supports, and ignited gasses force the pistons apart causing the cam followers to provide thrust to the rotor. The exhaust valve is opened as the pistons contract. Four strokes are completed each rotation. The valves can also be arranged to operate as a pump.

Abstract: A Hybrid Piston/Rotary engine having an elliptical housing comprising a circumscribed cam portion to provide thrust, and sides having bearing supports for rotation of a rotor with at least one cylinder attaching shaft having apertures therein, providing rotary valves combined with intake and exhaust ports within the bearing supports. Each cylinder has two opposed pistons connecting cam followers pivoted to the rotor which reciprocate upon rotation. During the intake stroke the pistons separate as intake valve opens, fuel mixture fills the cylinder and closes, the pistons compress the mixture. The rotor ports are aligned with the spark plugs within the bearing supports. Ignited gasses force the pistons apart causing the cam followers to push against the cam housing providing thrust to the rotor. The exhaust valve is opened as the pistons contract. Four strokes are completed each rotation. The mechanisms valves can be configured as a pump or a motor.