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Old 01-16-2017, 01:16 AM   #25 (permalink)
cRiPpLe_rOoStEr
It's all about Diesel
 
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The opposed-piston layout used to be mainstream for interwar German aircraft, but it was mostly Diesel and 2-stroke. Anyway, considering that a regular 4-stroke also has some inertial and frictional losses from a conventional valvetrain, the dual-crank setup might outweight this perceived disadvantage.
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