The crescent shape has poor efficiency because of the low volume to surface area... | Hacker News

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		phkahler on Dec 17, 2020 \| parent \| context \| favorite \| on: LiquidPiston's “inside-out” rotary X-Engine wins A... The crescent shape has poor efficiency because of the low volume to surface area ratio. A wankel has a similar issue but this looks worse to me.

fastball on Dec 17, 2020 [–]

The three small chambers are entirely sealed off from the main chamber during combustion, it is only crescent during intake/exhaust.

https://www.liquidpiston.com/how-it-works

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