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post #11 of Old 10-23-2009
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You can learn more than you ever wanted to know about prop slip calculations from David Gerrs Propeller Handbook. Basically to do it empiracally by running a measured distance at a fixed rpm to get a good accurate speed. Then you calculate the difference betwnn the actual speed and the speed you would have if there were no slip and devide that difference by the theoreticla slip free speed.. The fromula is aparent slip = (Pitch in inches/12 times RPM) - (Actual knots times 101.3) All divided by (ptich/12 times RPM)
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