SailNet Community - Reply to Topic

   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 > On Board > Gear & Maintenance > Mainsheet load on 31ft boat (need new block and cleat)
 Not a Member? 


Thread: Mainsheet load on 31ft boat (need new block and cleat) Reply to Thread
Title:
  

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

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
04-06-2011 01:45 AM
KeelHaulin I think I would stay with the two separate blocks on the boom, they are track mounted and you don't know what maximum load the track can handle in the event of a hard gybe. You might also consider going to a cascade system or double line sheet to gross/fine trim the sheet. Harken has systems like these, but they have a single block at the top. You might ask a Garhauer or Harken rep about it next week at the boat show.
04-04-2011 04:36 PM
zz4gta According to sailboat data, he has ~180 sf of main. Also, from looking at pictures, it's a 4:1 puchase on the mainsheet. So the block will need to be a double w/ becket and cam cleat.
Try one of the following.



Or something like the 2611 below, but a double
04-04-2011 04:15 PM
MarkSF I think it's actually 4:1. Guess I don't understand pullies much!
04-04-2011 04:03 PM
tommays On a much smaller J24 for example its 4:1 and i would sure not want any less

The biggest issue is more the peek loads during tacks and jibes and is what has broken plenty of hardware over the years
04-04-2011 01:40 PM
GeorgeB MarkSF, I just happen to have the formula to calculate sheet loads.

((Maximum expected windspeed) ^2*(sail area in square feet))/232

When I plug in your 150 square feet and 25 kts wind speed, I get a load of 404 pounds which is well within the smaller block’s specs. To get to a thousand pounds of load, or half the block’s rated strength, you need to sail in 40kt breezes. No reason to “over kill”. Garhauer makes a pretty good block (ball bearings, etc), they are just a little “industrial” looking. They will be at the boat show and if you can wait, they usually have pretty good show prices. I had to google the Bristol 31.1 to get an idea of your rigging set-up and I saw an ad for one being sold in Alameda. Is that yours? If so, my boat is not to far from yours so PM me if you have any questions about the area. We’ve been sailing out of the Estuary for many, many years and love the close proximity to the Central Bay and the Ocean.
04-04-2011 01:32 PM
MarkSF There are two blocks under the boom, and the cleat block is a double. It looks like 3:1 purchase.
04-04-2011 12:54 PM
zz4gta It's around 600-700 lbs, so the 2000 lbs would be way overkill. As moast Garhauer products are. Is it a single block with a cleat? Double? Tripple? What is the current purchase?
04-04-2011 11:58 AM
MarkSF
Mainsheet load on 31ft boat (need new block and cleat)

I need to replace the mainsheet block / cleat assembly on my Bristol 31.1. I looked at Garhauer, and they do 2000lb or 2800lb rating. Sounds ample for my boat? (180 sq ft mainsail)

Is the 2800lb one over the top? is 2000lb enough, or should I go for the extra margin?

There's no traveller, just a swivel that the block is attached to. Would be very surprised if the swivel is rated for 2000lb, so any suggestions for uprating that would be welcome.

 
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


All times are GMT -4. The time now is 06:45 PM.

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.