Prop Question

[Tom S.]

I just went to a 21 pitch prop from a 17 to get the WOT rpm's down. Does anyone have an idea how this will affect my trolling speed? It is a 4.3 I/O on a 24ft. H/T boat. Could get down to about 1.6 before.

[REW]

You can go to the following prop / speed / slip / calculator web page:

http://go-fast.com/Prop_Slip_Calculator.htm

You can plug in the variables - assume 0 slip - and you will find that you will go from about 1.6 to 2 mph - with the prop pitch change of 17 to 21.

Take care

REW