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#2
09-10-2015, 09:32 AM
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You are dropping a LOT of pitch going from 19p props to 15p props.
just plug the numbers in to the prop calc . . . boat setup is pretty straight forward. Once you get the engine height set right and weight distributed in the boat. Finding the right props is just math + a small amount of voodoo. Pitch is number of inches your boat moves forward per rotation of the prop. 19p = 19 inches 15p = 15 inches You have some slip . . . usually less with 4 blade props or large diameter props, but generally around 10% for recreational boats. Gear Ratio on the f115 = 2.15:1 Prop Calc http://www.go-fast.com/Prop_Slip_Calculator.htm What was the max RPM with the 19's?  
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