Thread Tools Search this Thread
Old 05 April 2015, 18:47   #1
Country: UK - England
Town: Budleigh Salterton
Make: Avon
Length: 3m +
Engine: Outboard 8hp
Join Date: Apr 2015
Posts: 1
Suitable Prop

I know this sort of question is asked a lot and there are hundreds of answers about how to find the correct pitch, however I don't have a tachometer and my current prop is not in a good state. Basically 3 metre SIB and 8hp Yamaha 4 stroke outboard currently with a 8.5" Diameter 6.5" Pitch Prop (quite badly worn) do I replace with the same or go for a larger pitch? Is there a good starting pitch to try or am I best off getting a tachometer and running the tests on my current prop and then doing the maths? Any help is much appreciated

shley87 is offline   Reply With Quote
Old 06 April 2015, 11:38   #2
RIBnet admin team
Poly's Avatar
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,770
You won't get a brilliant answer even with a tach and a damaged prop. in any case a sib is so sensitive to assembly, pressure, loading etc that a prop an inch or two different is not necessarily going to change much. Does the current prop give ok performance? If so then I'd replace with the same. especially if they were bought together as someone presumably chose them for a reason, if only because they were the default which is what you are asking for.
Poly 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

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 17:41.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.