Thread Tools Search this Thread
Old 30 March 2013, 08:53   #1
Country: UK - Wales
Town: Swansea
Boat name: Space Hopper
Make: RibTec
Length: 5m +
Engine: Evinrude E-Tec 75
Join Date: May 2012
Posts: 76
what size prop mercury 75 2 stroke

I am trying to find the correct prop for my merc 75 two stroke, the guy I bought it from put on the wrong one, its currently got h14 x 13p on it, I think it needs more pitch, top speed s about 30 knotts.

wanted to put on a nice stainless one, can someone helpme out?

mctaggart is offline   Reply With Quote
Old 30 March 2013, 09:33   #2
Country: UK - England
Town: bicester
Length: no boat
Engine: outboard only
Join Date: Feb 2009
Posts: 851
there are propeller charts at merc/mar dealers but they will need to know what revs you are doing at wide open throttle and the weight of the boat including people and equipment an estimate for the weight will be ok,But remember the only accurate test is the water test. welcome to the black art of propellers.

uncle al is offline   Reply With Quote
Old 30 March 2013, 10:38   #3
Country: UK - England
Town: Northampton
Make: RibTec
Length: 5m +
Engine: Outbaord mariner 75
Join Date: Apr 2011
Posts: 506
Ok my 1991 Mariner 75hp 2 Stroke has a 17inch pitch prop on .
5500rpm at wot.
pushing a old ribtec 5.35
does about 40 Knotts
hope this helps
jezza2011 is offline   Reply With Quote
Old 30 March 2013, 15:29   #4
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,332
You cant really say which prop is right for you as its sort of personal choice. Firstly you need to find out what revs you are pulling at wide open throttle you need the engine to be at about 5200-5400 rpm. I guess with a 13" you will be over that rev range? Then once you know the RPM you can work out the pitch, each inch of pitch will gain or loose about 200-300 rpm so you should be able to get it about right from there.
Black Dog Marine
Turbodiesel is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 08:32.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.