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RCV SP series engines
have a 2:1 output gearing, therefore the propeller is rotating
at half the speed of the crank. This enables the use of
larger, more efficient fully scale propellers. Propeller
pitches would normally be between 10 and 14 inches (double that
of a conventional engine).
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RCV CD series engines use
conventional sized propellers. This generally means a pitch
of 4 - 8, depending on the type of flying you prefer.
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