Home › Forum › Ask A Member › Top speed with 18hp Evinrude on 14′ aluminum › Re: Top speed with 18hp Evinrude on 14′ aluminum
March 12, 2017 at 12:24 am
#54158
The prop is 9” diameter and 10” pitch. I’d like to prop it down a bit to handle more weight. I removed about 150lbs of weight from the boat and went from 15mph to 19mph. I think it was a difference of about 400RPM. Should I go down to a 9×9 or try a 9.25×7? I’m running about 4,450RPM in "light form and about 4k, to 4,100RPM in semi loaded form. Max hp is at 4,500 RPM, but max RPM is 5,0000.