This model shows the internal structure and operating principles of a Winkle engine. This model is cut away to show the internal constructional details. Unlike other engines, the rotary piston engine avoids reciprocating parts. The power piston is an arch like triangular rotor which upon rotation generates an epitrechoid. . Hand powered motion supplied through a crank demonstrates the moving parts of the engine as a hand crank is rotated. A simulated spark plug uses a small lamp to indicate the firing point. A placard on the base labels all key components. Perfect for classroom demonstration or as a gift for the car enthusiast executive