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GR is the number of revolutions the crankshaft needs to produce one revolution of the prop shaft. Drive Motors - Single or Twin Drive System Units absolute minimum revolutions per minute required to achieve the speed. And slower turning props generate less noise - therefore, larger diameter props run quieter than smaller diameter props, all else being equal. Use this Calculator to assist in the power system selection process. Over-propping can do irreversible damage to electric motors and ESCs, because an incorrect propeller will force the motor to work harder than it was designed to. Prop Airplanes.
Boat Prop Calculator. Never ever underestimate the potential for an rc plane propeller to do serious damage.
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PP is the blade pitch of propeller (inches).