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Prop Calculator

Engine Horsepower
Engine Max RPM
Number of bearings between gearbox output and prop
Gearbox reduction ratio
Max displacement in pounds
LWL - Length at waterline in feet
Max Speed required - in knots
Hul C - 140 for normal yacht / 150 for runabout / 190 for fast / 210 for racing

Category 3 bladed prop 2 bladed prop 4 bladed prop
Prop Size
Prop Pitch

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Calculated values from inputs used to derive size and pitch

Power Required numbers

Prop Pitch Numbers