Wankel Rotor

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The Wankel engine is an internal combustion engine featuring an eccentric rotary design that converts pressure into rotation. Distinct from reciprocating piston engines, the Wankel provides benefits such as simplicity, smoothness, compactness, high RPMs and a high power-to-weight ratio due to its three power pulses per revolution compared to a two-stroke engine's one per revolution and a four-stroke engine's one per two revolutions. -WikiA more concise version with key details retained