Abstract: A rotary internal combustion engine includes a stationary housing having one or more housing slots extending to a housing interface surface and a rotor, having one or more rotor slots extending to a rotor interface surface turning adjacent to the housing interface surface. A piston and an adjacent vane are slidably mounted in each housing slot, and an intake valve is included to open each housing slot to an intake port. A spark plug is mounted in an outer surface angularly adjacent to each housing slot. The rotor includes cam surfaces to impart motion to each intake valve, piston, and vane. As each rotor slot moves adjacent to each housing slot, a vane is moved into the rotor slot and an intake valve is opened. A mixture of air and fuel floods the space of housing and rotor slots outside the piston on one side of the extended vane, while exhaust gasses from previous combustion are forced out of the space on the opposite side of the extended vane, through an exhaust port, by the motion of the rotor.

Abstract: A reversible hydraulic motor has a forward and a reverse drive section, each separated by a separating plate. Each section has an outer ring, end plate and inner rotor forming a chamber therebetween. Each rotor has a pair of radial slots, separated by 180.degree., and a piston moveable in each slot. An extension form the outer ring to the rotor divides the chamber and moves the pistons inward into the rotor slots at the end of each revolution. Hydraulic fluid is selectively applied, under pressure, to the desired direction section to the interior space between the rotor slot and the piston during the 180.degree. after the rotor rotates past the extension. Each piston has a fluid path therethrough to allow the provided hydraulic fluid to exit the piston interior space into the chamber in a direction opposite to the desired direction of rotation. This exiting fluid builds up pressure in the chamber and rotates the piston and rotor. A fluid return path is provided in the second 1/2.degree.