Help with Prop Selection

About inboard or outboard motors.

Moderator: Bill Edmundson

User avatar
indyillini
Posts: 51
Joined: Sun Apr 26, 2009 6:40 pm
Location: Indianapolis, IN

Help with Prop Selection

Postby indyillini » Tue Apr 10, 2018 11:58 am

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.

User avatar
Bill Edmundson
Posts: 11080
Joined: Wed Nov 23, 2005 6:45 am
Location: Birmingham, AL, USA
Contact:

Re: Help with Prop Selection

Postby Bill Edmundson » Tue Apr 10, 2018 12:19 pm

Indy

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

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

User avatar
indyillini
Posts: 51
Joined: Sun Apr 26, 2009 6:40 pm
Location: Indianapolis, IN

Re: Help with Prop Selection

Postby indyillini » Tue Apr 10, 2018 12:23 pm

The Full throttle RPM is 5000-6000.

User avatar
Bill Edmundson
Posts: 11080
Joined: Wed Nov 23, 2005 6:45 am
Location: Birmingham, AL, USA
Contact:

Re: Help with Prop Selection

Postby Bill Edmundson » Tue Apr 10, 2018 12:31 pm

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
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

User avatar
hoodman
Posts: 1800
Joined: Thu Nov 10, 2011 8:48 am
Location: Lafayette, IN

Re: Help with Prop Selection

Postby hoodman » Tue Apr 10, 2018 12:38 pm

Congrats on nearing the end of your build!


Return to “Boat Power”

Who is online

Users browsing this forum: No registered users and 5 guests