When I saw this, I was hoping you had a sixty!
I haven’t seen many EVOxs with 90s around on this site Matt but Hopefully someone will pipe in. You’d probably have good luck sending Kevin at EC an email or call to get his recommendation. He seems to be pretty responsive to everyone With questions.Anyone running a four blade on their Evo x with a Suzuki 90? What pitch?
According to the picture of my GPS its 47.4mph @ 6250 and 45.5 @ 6062. You can go ahead and throw any of the prop slip calculations out the window as far as I'm concerned. When I dialed in the prop on my Lostmen and gave Ken at prop gods the numbers he was saying it was impossible as I had negative slip numbers. So either 3 different GPS units are wrong or the slip calculations are not exact math.What was your engine rpm? With a 21P prop at 6300 rpm to get the numbers you are getting, it would need to be at a 2% slip for 47.4 mph and just over 5% slip for 45.5 mph.
Whereas the OSN3 at 6300 rpm would be 9% and 15% slip.
Prop was thrown on a 21 form block by my prop guy, it has also had cup added which the calculators dont factor in. Personally I don't use the calculators as they've never been close. Blade style is also a factor in which the calculator doesn't factor in.More likely the prop is not the labeled pitch, math is correct, just the inputs are wrong. I am using a PowerTech PTR4 18 pitch and would like to get a 3 blade prop. Also would like it to be a little more stern lifting, rather than bow lifting. Lots of people like the Mercury props.