My boat is a 1995 Genesis 1810 Ski/Fish with 135 hp inline 4 Mercruiser 3.0 Alpha One 2.0 gear ratio. I am currently running a 20" pitch 4 blade aluminum prop (I think Alpha 4) getting the following results at WOT (4400 - 4800)...
Boat Tach RPM - 4550
GPS Speed - 37 MPH
These results were...
