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.
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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