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Help with Prop Selection

Posted: Tue Apr 10, 2018 11:58 am
by indyillini
I am completing my build and need to add a prop to my motor. I have built the Overniter and have installed a 2016 Mercury 4 stroke 90HP Gearcase ratio 2.07:1. I have tried the online calculators and have been getting recommendations all over the place. Can someone offer a recommendation on what I should start with? I am leaning toward a 4 blade diameterXpitch 13.5x15. Does that sound reasonable? Thanks for the help.

Re: Help with Prop Selection

Posted: Tue Apr 10, 2018 12:19 pm
by Bill Edmundson
Indy

What is your max. RPM? (WOT). I think your going to be able to get to about 38 MPH.

Bill

Re: Help with Prop Selection

Posted: Tue Apr 10, 2018 12:23 pm
by indyillini
The Full throttle RPM is 5000-6000.

Re: Help with Prop Selection

Posted: Tue Apr 10, 2018 12:31 pm
by Bill Edmundson
I'm seeing about a 13 or 14 pitch. You may need a 3 blade to get to RPM. The dia. seems a little big for a 90 hp. But, I don't run a Merc.

I worked off of 5500 RPM.

Bill

Re: Help with Prop Selection

Posted: Tue Apr 10, 2018 12:38 pm
by hoodman
Congrats on nearing the end of your build!