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aircraft engines are designed to turn at slower RPMS because the speed is limited by the prop tips going beyond the speed of sound. Automobile engines develop rated horsepower at higher RPMS and therefore need a gearbox to spin the engine at enough RPM to develop rated power. Building a successful gearbox and beating torsional resonance is no mean feat as discovered by lycoming and continental with G0 300 and the geared 6 cyl in the navajo cheiftain. Hats of to the german engineers for making it work very well in the rotax.