Cruisers Forum

  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
Thread Tools Search this Thread Rate Thread Display Modes
Old 04-01-2010, 22:37   #1
Registered User

Join Date: Dec 2008
Location: Melbourne Australia
Boat: Wilf O'Kell 46 Ketch "Meanda"
Posts: 20
Images: 1
Prop Size

I have a 46 footer weighing 19 tonne. It has a Perkins 120 with a governed speed of 2800rpm and a 2:1 73 series B.W. box. My prop is way too pitched at 22inch Dia. and a pitch of 24 inches. I am guessing it should be in the 16-18 inch pitch range. Does anyone else have a similar setup that works well. I have no tacho at the moment but it sounds like at full throttle I would still be under 1500 or so revs and 5.5kn is the best it will do.
meanda46 is offline   Reply With Quote
Old 04-01-2010, 22:46   #2
Registered User

Join Date: Jan 2009
Location: San Diego, California - Read about our circumnavigation at
Boat: Contest 48
Posts: 995
Images: 1
I have a 48' ketch that weighs about the same amount and has a 37' waterline. I just installed a Beta Marine 90 that's supposed to develop 90 horsepower at 2,600 RPM. It's coupled to a ZF Hurth 45A transmission that's set for a 2.43 ratio. At the same time, I installed a Gori 24"x18" 3-bladed prop. It's pretty close to being right. WOT (Wide Open Throttle) I can get up to 2,400 RPM and I'm running at 8 knots, just .3 knots off hull speed. If I were to do it over again, I think I may have ordered a 17"-pitched prop but I think I've got things pretty close for my boat.

Fair winds and calm seas.
nhschneider is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Prop size guides? Orion Jim Propellers & Drive Systems 5 16-10-2014 13:16
Prop Size: 17" vs 18" bmartinsen Propellers & Drive Systems 25 16-11-2011 12:51
Prop Size - Ranger 28 chad2072 Propellers & Drive Systems 4 04-06-2010 21:43
Prop Shaft Size? Eddie Propellers & Drive Systems 6 19-06-2009 08:20
Proper Prop Size SkiprJohn Propellers & Drive Systems 16 19-09-2007 00:49

Advertise Here

All times are GMT -7. The time now is 18:54.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.