Posted by Tom W Clark on 02/25/13 - 9:05 PM
#2
39 MPH at 5600 RPM through a 2:1 gear ratio with a 17" pitch prop is over 13 percent calculated propeller slip. That is quite high for the BRP Viper model.
Switching to the 19" Viper will, ceteris paribus, drop your RPM down to just over 5000 RPM, within the optimal RPM range.
Those Boats.net Viper prices are VERY good. Still, you could buy a 17" Stieltto Advantage for a little less and it would probably be a better prop for you.
Edited by Tom W Clark on 02/26/13 - 7:07 AM