Prop Slip Calculation

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Yamaha 200VMax 2002
Carburated
Cubic Capacity 3100cc
Reduction Gear Ratio 1.81

Optimum rev range 4500 - 5500

@ 4000 revs actual speed 26 knots
@ 5100 revs actual speed 31 knots
@ 5300 revs actual speed 34 knots

Prop Yamaha Saltwater Series II 15 1/4 x 17"

Slip calculation

VT (theo speed) = (revs per min/reduction ratio) x [(pitch x 0.02540) x (60/1852)]
VR (actual speed)

%SLIP = [(VT-VR)/VT] x 100

VT = (4000/1.81) x [(17 x 0.02540) x (60/1852)] = 2209.94 x 0.4318 x 0.03240 = 30.91 knots

% SLIP = [(30.91-26)/30.91] x 100 = 15.88% SLIP @ 4000 revs

% SLIP = [(39.42-31)/39.42] x 100 = 21.36% SLIP @ 5100 revs

% SLIP = [(40.96-34)/40.96] x 100 = 17.00% SLIP @ 5300 revs