sailing boat lines

Sailing n Cruising HOME

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



Return to Sailing n Cruising

Calculated values from inputs used to derive size and pitch

Power Required numbers

Prop Pitch Numbers