We are testing Tohatsu 50Hp 2T, with original propeller 12 inch pitch and aftermarket 14inch pitch.
surprisingly the original propeller (12 inches pitch) is clocked 30.8 knots, and 0.8 knots faster than the aftermarket 14 inches pitch.
this condition could be :
1. due to sea current.
2. due to original propeller is already designed, tested end engineered for the particular engine.
Many factors can contribute to this result, as we are not the certified test center, we would like to say this video is unable to proof anything, just a picture what we were doing on that day.
and we can calculate the boat speed by knowing the propeller pitch, and the engine rpm, and also the final gear ratio.
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6:31 the sub-title should be test 4 with propeller no 12!!! typo....
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