Size Numbering on Winches - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest > General Discussion (sailing related)
 Not a Member? 


Like Tree9Likes
Reply
 
LinkBack Thread Tools
  #11  
Old 12-23-2012
Bristol 45.5 - AiniA
 
Join Date: May 2006
Posts: 3,053
Thanks: 3
Thanked 50 Times in 45 Posts
Rep Power: 9
killarney_sailor is on a distinguished road
Re: Size Numbering on Winches

Try this site

Winch comperarison - Self-tailing models
L124C likes this.
__________________
Finished the circumnavigation in early February in Grenada. Have to work on a book project for the next several months so the boat will be waiting for next year.
Reply With Quote Share with Facebook
  #12  
Old 12-26-2012
Junior Member
 
Join Date: Dec 2012
Location: Vancouver, BC
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
firemagi is on a distinguished road
Re: Size Numbering on Winches

I never serviced my winches until they seized completely. Never needed the hole-in-cardboard-box trick because there simply would be no loose parts to lose.
Reply With Quote Share with Facebook
  #13  
Old 12-27-2012
L124C's Avatar
Senior Member
 
Join Date: Oct 2007
Posts: 1,383
Thanks: 47
Thanked 3 Times in 3 Posts
Rep Power: 7
L124C is on a distinguished road
Re: Size Numbering on Winches

Quote:
Originally Posted by killarney_sailor View Post
Thanks for the link and OP! Good question and the answers make me feel very silly.

I was told a long time ago (by someone who SHOULD have known!) that the winch number was the manufactures rough estimation of the length of boat for which the winch would serve as a primary. It wasn't really an issue for me, so I accepted it. However, I often wondered why my Lewmar ST 40's (and me) sometimes get worked in a good blow on my 30 foot boat. I thought: "I'm not exactly a small guy, and 40's should be overkill!"). I could always head up, but thought that I shouldn't need to with my guns and the mighty ST 40's.
Now, I can stop fighting it. Whew....what a relief! (no ego here!)

I do wonder how they match the winch to the probable load. Is there a formula for sail size to winch power ratio?
I assume the power ratio on the chart is for low gear (on two speed winches), as they would want to rate the most power you could expect from the winch, when push comes to shove. Correct?

Regarding the winch service issue: I found a small plastic bucket in the paint department at the hardware. I cut the bottom out and it fits nicely around the base of the winches to retain parts when I service them. If it needed to be bigger, I could have removed more of the lower section of the bucket to fit.

Last edited by L124C; 12-27-2012 at 03:50 PM.
Reply With Quote Share with Facebook
  #14  
Old 12-27-2012
Senior Member
 
Join Date: Feb 2012
Location: New Orleans Louisiana
Posts: 1,790
Thanks: 6
Thanked 41 Times in 39 Posts
Rep Power: 3
Stumble is on a distinguished road
Re: Size Numbering on Winches

L124C,

There are formulas that can generate expected sheet loads based on sail area and wind speed. When you combine this with the maximum work output of 50lbs peak, you can pretty easily figure out the minimum power ratio you need on a winch.

The issue is that while most builders use 50lbs, many people prefer an easier workout and want more power.

The formula btw is:

Geneoa
SL = SA x V≤ x 0.00431

Where:
SL = Sheet Load in pounds
SA = Sail Area in square feet
V = wind speed in knots

Main

ML = E≤ x P≤ x 0.00431 x V≤)
(√P≤ + E≤) x (E - X)

Where:
ML = Mainsheet Load in pounds
E = Foot length on main in feet
P = Luff length of main in feet
V = Wind speed in knots
X = Distance from aft end of boom to mainsheet attachment point
killarney_sailor and L124C like this.
__________________
Greg Rubin
Attorney
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Does size matter?? Wheel size, that is... Undadar Gear & Maintenance 9 09-17-2011 07:39 PM
Hull numbering scheme johnbanfield Pacific Seacraft 7 11-27-2010 05:47 AM
Slip size and boat size. rikbass Announcements and Suggestions Box 12 09-14-2010 02:52 PM
self tailing winches but what size saurav16 Gear & Maintenance 24 07-11-2007 09:06 PM
sail size to boat size ronbrockman General Discussion (sailing related) 0 09-25-2001 04:10 PM


All times are GMT -4. The time now is 12:51 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.