转子活塞发动机用的是四冲程循环，但是它们和四冲程活塞发动机有很大不同。
Gas turbine engines use the Brayton cycle. Wankel rotary engines use the Otto cycle, but they do it in a very different way than four-stroke piston engines.
转子发动机比通常的活塞式发动机噪音小也是大家所公认的。
It is also generally conceded that Wankel engines are quieter than comparable piston engines.
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