Thread Tools Search this Thread
Old 27 August 2008, 08:22   #11
Country: France
Town: Cannes
Boat name: midkat 550
Make: apoge
Length: 5m +
Engine: 2x50 Tohatsu
Join Date: Jan 2008
Posts: 126
On my Tomcat/Stingray 4.5m catamaran, I am running a SS Powertech SRG3 on a Merc 60-EFI, small foot (not the big foot), it is a 12.50 diameter, and the blade area is very close to that of big foot props.

The other standard props (diameter 10" approx.) aluminium, SS or composite like the 4 blades Comprop do not work well (they don't push, and they cavitate ...) on this hull because of not enough blade area and/or length/diameter.
The problem is for sure the diameter, because the Comprop has more overall blades area than SRG3.

I think there is no other prop of this size for 13-splines 50/60Hp matching its performance, and I have a spare one in 13"

yorfuoj is offline   Reply With Quote
Old 27 August 2008, 08:35   #12
Country: UK - England
Town: Brum
Boat name: UTV
Make: zodiac FR
Length: 3m +
Engine: 2 stroke 15hp
MMSI: 999
Join Date: May 2003
Posts: 379
I have a Michigan Rapture thats 11 3/4 inches x pitch of 15" and it fits my small gearbox 13 spline 60hp 2 stroke. Performance was limited by the max 4800 rpm achieved. I have also run a 17" pitch quicksilver. Settled on a 13" pitch quicksilver, which I started with . It runs to around 5300-5600 rpm and gets about 33 knots, quick hole shot with a full tank and 5 adults, 27 knots.
The gearbox ratio on this engine is quite high, 1:2.1. I think. The prop spins faster than most outboards hence the lower than expected pitch.

Big waves, small boat ;)
tinker 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 15:11.

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