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We'll never know what could have become of the full potential of the Rutan + Chapman collaboration. The Lotus engine was a marvel, with fewer moving parts and lighter weight. Most ultralight engines of the time required the crank to be geared down to roughly half speed. Chapman realised that by driving the prop off the cam (which turns 1/2 speed) that they could simplify the entire mechanism and shed weight!

Cheers,
Kiyoshi
 
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