suicidealli
Well-Known Member
On my bass boat I run 1.75 gears. On my drag I run 1.87 gears.
Tightening up a prop is to work the prop to run like a bigger prop.
You can add some pitch for a drastic example.
Add some tip cup, makes them a little harder to turn. "less rpms" And usually adds mph.
My favorites, is changing the finish on the prop. Different finishes can loosen a prop up, or can tighten up. Make it grab the water more = Less rpm, and can be more mph.
A rough sanded prop will slip a lot more than a highly polished prop. There is a lot of in between. Also doin one side, one way and the otherside different.. Depending what you want the prop to do..
Polish part of the blade, and sanded finish in certain areas to loosen them..
DAH is good for that. My best top end prop for my 2002 I did it too.
Should give you an idea of tighten, and loosen a prop.
Usually about 200 rpms either way depending what it is when you start Is max for changing the finish.
Adding some tip cup to a yammi drag changes them big time..JMO
I do mine myself, and it is easy to tell the difference.......
I have several 24 and cruising at 4000 rpm's they are 6 mph different from best to worse... I test them at all different rpms, to see what changes effected them to what I did...... It has been a long learning curve..........
At one point I had tennis elbow from banging on so many props...lmao....
Roy
Roy
