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Help with Prop - calculators show 0% slip ??
I have 1999 DF70 with a 13 1/2 x 15 prop mounted on a 16ft aluminum bass boat. Its a aluminum 3 blade and I believe the prop is a progressive pitch. Just looking for some prop help and suggestions.
I need to get a new prop and have been checking out these online calculators and they all say I have very little to no slip. This seems wierd but maybe its the progressive pitch prop that screws them up???
I have tried a couple different mounting heights and I have some test results. All the tests are done with the Suzuki Multi-tack and GPS.
Weird thing to me is the RPM to speed ratio didn't really change with raising the motor to the third hole. The only thing that changed is that I can easily over rev it now. I also thought it seemed like there was less boat drag, more boat out of the water. Basically, I would like the best prop for 1) gas usage 2) Top End and 3) Hole shot. That being said I,m thrilled with the gas usage and Hole shot right know. It planes instantly, like 2.6 milliseconds.
Here's the results:
RMP____Hole_MPH__Hole_MPH
3000-----1----12----3----12
3500-----1----20----3----20
4000-----1----22----3----23
4500-----1----27----3----28
5000-----1----30----3----30
5800-----1----35----3----35
6000-----1----36----3----36
***Hole 1 WOT hits 6000 RPM just over 20the 5800 max.
***Hole 3 at 6000 IS NOT at WOT and I didn't push it further.
I need to get a new prop and have been checking out these online calculators and they all say I have very little to no slip. This seems wierd but maybe its the progressive pitch prop that screws them up???
I have tried a couple different mounting heights and I have some test results. All the tests are done with the Suzuki Multi-tack and GPS.
Weird thing to me is the RPM to speed ratio didn't really change with raising the motor to the third hole. The only thing that changed is that I can easily over rev it now. I also thought it seemed like there was less boat drag, more boat out of the water. Basically, I would like the best prop for 1) gas usage 2) Top End and 3) Hole shot. That being said I,m thrilled with the gas usage and Hole shot right know. It planes instantly, like 2.6 milliseconds.
Here's the results:
RMP____Hole_MPH__Hole_MPH
3000-----1----12----3----12
3500-----1----20----3----20
4000-----1----22----3----23
4500-----1----27----3----28
5000-----1----30----3----30
5800-----1----35----3----35
6000-----1----36----3----36
***Hole 1 WOT hits 6000 RPM just over 20the 5800 max.
***Hole 3 at 6000 IS NOT at WOT and I didn't push it further.