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Apples and oranges on the airplane engine reference. The point refers to propeller pitch and rpm. Not bore/stroke.
On an ecomodder note though they are extolling the virtures high pitch and wider throttle opening (high manifold pressure). The same thing as gearing tall to slow the engine and opening the throttle wider.
Those Lycoming engines are like super reliable air cooled VW engines. Pretty basic low speed engines built to never fail. I don't know the bore/stroke often used in the Lycoming engines though, guessing they are undersquare.
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Good design is simple. Getting there isn't.
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