Prop info ... - SailNet Community
LinkBack Thread Tools
post #1 of 4 Old 10-11-2002 Thread Starter
Junior Member
Join Date: Oct 2002
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Prop info ...

I have an Irwin 31'' sloop with a 15 hp Yanmar engine. The boat has a 2 blade prop, 13 x 13 x 7/8, 3200 rpm @ 6.5 k. I would like info for a 3 bladed prop to increase the speed and performance.
Joe Fox is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
post #2 of 4 Old 10-11-2002
Senior Nappy Headed Ho
Join Date: Feb 2001
Posts: 734
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Prop info ...

To increase speed and performance I would suggest a new full battened main (5-7 oz. material) and perhaps a tri-radial 150% genoa; personally, I like the products from North.
Denr is offline  
Quote Quick Reply Share with Facebook
post #3 of 4 Old 10-11-2002
Senior Member
paulk's Avatar
Join Date: Jun 2000
Location: CT/ Long Island Sound
Posts: 2,627
Thanks: 4
Thanked 26 Times in 25 Posts
Rep Power: 16
Prop info ...

6.5 knots sounds pretty quick for a 15hp engine on a heavy 31 foot boat. Changing to a 3-bladed prop might add a little speed under power, and it might not; the engine is only so powerful and the boat''s weight isn''t being reduced. The three blades could easily cut sailing speed by half a knot in all conditions. For water-skiing, you''ll need a different boat.
paulk is offline  
Quote Quick Reply Share with Facebook
post #4 of 4 Old 10-12-2002
Senior Member
Join Date: May 2002
Posts: 275
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Prop info ...

First of all, I agree with Denr''s point.If six and a half knots isn''t enough, get a power boat.
I don''t think your going to do any better.A three blade prop will not give you more speed, but it will move the boat better through wind, seas and currant.Personaly, I think that with a fifteen horse engine and a displacement of nine thousand three hundred,(which is light for a thirty-one footer and IS the reason your getting six and a half)your lucky to be getting the six and a half

windship is offline  
Quote Quick Reply Share with Facebook

Quick Reply

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Zincs for Sail Prop feathering prop jrbarn Gear & Maintenance 4 09-20-2006 11:40 AM
how to remove folding prop? mcagney Gear & Maintenance 1 07-20-2005 11:23 AM
Prop for Pearson 35 gbeardmore General Discussion (sailing related) 2 05-27-2001 01:08 PM
Prop for Atomic 4 gbeardmore Gear & Maintenance 0 05-03-2001 02:15 PM
Prop for Pearson 35 gbeardmore Gear & Maintenance 0 04-24-2001 01:49 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome