Thread Tools Search this Thread
Old 12 May 2015, 08:15   #11
Locozodiac's Avatar
Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
Join Date: Sep 2007
Posts: 1,706
Factory engines with delivered props gives very good performance on light to medium light applications, usually at near full wot factory stated rpm. Install the induction tach, go for a wot spin you alone with lightly loaded boat on ideal flat calm, no wind water cond. and check achieved max wot rpm, compare them to engine's factory wot parameters to check if inside safe ones.

That engine revs 5-6K rpm, check if in that range, can play with prop pitch to be at or very near 6K. One -, + prop pitch is around 150-200 rpm difference,

Happy Boating

Locozodiac is offline   Reply With Quote
Old 23 May 2015, 15:02   #12
tuskar's Avatar
Country: Ireland
Town: Waesfjord
Make: Excel sd 2.9
Length: under 3m
Engine: Mariner 8hp 2S 1986
Join Date: Nov 2014
Posts: 56
Hi folks,
Got the tach meter during the week and got out on the river today for a run myself and a passanger 14st each .The engine clocked 6400 rpm. ie with the 8 ' pitch prop. So am I correct in calculating an 11 or even 12' prop would be suitable ? The recommended rpm is 5500rpm

tuskar 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 18:30.

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