NSU subsequently licensed the design to companies around the world, that have continually made improvements. He began development in the early 1950s at NSU, completing a working prototype in 1957. Wankel received his first patent for the engine in 1929. The design was conceived by German engineer Felix Wankel.

4.7 Spark Controlled Compression Ignition (SPCCI).

4.6 Homogeneous charge compression ignition (HCCI).

The engine is commonly referred to as a rotary engine, although this name is also applied to other completely different designs, including both ones with pistons and pistonless rotary engines. The definition of displacement applies to only one face of the rotor as only one face is working for each output shaft revolution.

The four-stage Otto cycle of intake, compression, ignition, and exhaust occurs each revolution of the rotor at each of the three rotor faces moving inside the oval-like epitrochoidal housing, enabling the three power pulses per rotor revolution.

For comparison, in a two-stroke piston engine there is one power pulse for each crankshaft revolution (as with a Wankel engine output shaft) and, in a four-stroke piston engine, one power pulse for every two revolutions. In one revolution, the rotor experiences power pulses and exhausts gas simultaneously, while the four stages of the Otto cycle occur at separate times. However, the output shaft uses toothed gearing to turn three times faster giving one power pulse per revolution. Wankel engines deliver three power pulses per revolution of the rotor using the Otto cycle. The rotor, which creates the turning motion, is similar in shape to a Reuleaux triangle, except the sides have less curvature. The Wankel engine is a type of internal combustion engine using an eccentric rotary design to convert pressure into rotating motion.Ĭompared to the reciprocating piston engine, the Wankel engine has more uniform torque less vibration and, for a given power, is more compact and weighs less. Norton Classic air-cooled twin-rotor motorcycle

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