Topping lift loads? - SailNet Community
 12Likes
Reply
 
LinkBack Thread Tools
post #1 of 26 Old 05-06-2014 Thread Starter
Frozen Member
 
AlaskaMC's Avatar
 
Join Date: Aug 2010
Posts: 564
Thanks: 25
Thanked 20 Times in 19 Posts
Rep Power: 5
 
Topping lift loads?

Hi everyone. As our boat nears splash day, one of our last projects is the topping lift. Could anyone tell me if the loads on a topping lift are ever significant? I am buying the blocks for it and my mind tells me the loads are essentially lifting the boom, but is there ever a time where there are more? Light wind you could use the lift while sailing for additional draft but the stresses would be very light no?

Any thoughts? Thanks again. You have all made this maintenance/update season much easier. I owe you all a beverage!

EDIT: Oh yeah, that would be on a Mac 25.
AlaskaMC is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 26 Old 05-06-2014
Senior Member
 
CaptainForce's Avatar
 
Join Date: Jan 2006
Location: living aboard since 1972
Posts: 1,715
Thanks: 0
Thanked 12 Times in 12 Posts
Rep Power: 10
 
Re: Topping lift loads?

I can only think of a few cases when the load would be greater than the weight of the boom and folded mainsail. I do sometimes stand on the main boom close and foreward, near the gooseneck when I first lifting myself for a trip up the bosun's chair to the masthead. There are also times when I tighten the main sheet with the sail down in order to keep my main boom stil in a chop at the dock or motoring. If the main is not snug with the sheet the shock load on the topping lift as the boom swings with a rock can be significant.

I must confess that I adjust my topping lifts on my main and mizzen booms with a half Duncan Yo-Yo passed through a loop. My half plastic yo-yo disc is likely my weakest link, but I haven't had them fail....


.... I replace them every five years due to UV damage.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Take Care and Joy, Aythya Crew

Last edited by CaptainForce; 05-06-2014 at 05:18 PM.
CaptainForce is offline  
Quote Quick Reply Share with Facebook
post #3 of 26 Old 05-06-2014 Thread Starter
Frozen Member
 
AlaskaMC's Avatar
 
Join Date: Aug 2010
Posts: 564
Thanks: 25
Thanked 20 Times in 19 Posts
Rep Power: 5
 
Re: Topping lift loads?

Great points! No issue here on going up the mast as it is a trailer sailer and I wouldn't trust my weight up that mast. Instead I would just crank it down with the mast raising system I built. I also tension the main sheet when at anchor or dock for the same reasons at times, but never anything that would put too much on a block or rivet to strain it.
AlaskaMC is offline  
Quote Quick Reply Share with Facebook
post #4 of 26 Old 05-06-2014
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,534
Thanks: 104
Thanked 312 Times in 300 Posts
Rep Power: 10
     
Re: Topping lift loads?

The biggest load you'll see on your TL is when you forget to ease it and haul on the mainsheet....
AlaskaMC likes this.

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Faster is offline  
Quote Quick Reply Share with Facebook
post #5 of 26 Old 05-06-2014 Thread Starter
Frozen Member
 
AlaskaMC's Avatar
 
Join Date: Aug 2010
Posts: 564
Thanks: 25
Thanked 20 Times in 19 Posts
Rep Power: 5
 
Re: Topping lift loads?

Quote:
Originally Posted by Faster View Post
The biggest load you'll see on your TL is when you forget to ease it and haul on the mainsheet....
Uh, how did you know that? You must be a psychic!
davidpm likes this.
AlaskaMC is offline  
Quote Quick Reply Share with Facebook
post #6 of 26 Old 05-06-2014
Senior Member
 
Join Date: Dec 2010
Posts: 776
Thanks: 158
Thanked 67 Times in 63 Posts
Rep Power: 5
 
Re: Topping lift loads?

You might possibly need it as an emergency halyard, so you might size it accordingly
christian.hess likes this.
Multihullgirl is offline  
Quote Quick Reply Share with Facebook
post #7 of 26 Old 05-06-2014
Living the dream
 
ReefMagnet's Avatar
 
Join Date: May 2008
Location: Mackay Qld AU
Posts: 178
Thanks: 5
Thanked 14 Times in 13 Posts
Rep Power: 8
 
Re: Topping lift loads?

The topping lift needs to be able to survive hauling down hard on the mainsheet.

On a trailer sailer maybe not so important, but I use spectra to keep the diameter small but load capacity high so I can also use the boom as a makeshift crane, including MOB recovery, if needed. Also for mast climbing the topping lift is often used as an additional safety line.
ReefMagnet is offline  
Quote Quick Reply Share with Facebook
post #8 of 26 Old 05-06-2014
no longer reading SailNet
 
Alex W's Avatar
 
Join Date: Oct 2012
Posts: 2,309
Thanks: 2
Thanked 140 Times in 133 Posts
Rep Power: 3
 
Re: Topping lift loads?

1/8" amsteel has a breaking strength of 2300lbs and makes a great topping lift. The small Harken carbo block is good for hundreds of pounds, which has been enough for my topping lift.

7/64" is more than strong enough too, but it's a bit harder to splice when it gets that small.

My main sheet is left adjusted so that it is slightly longer than the leech of my sail, and so it is slack when you are out sailing.

I'm no longer participating on SailNet.
Alex W is offline  
Quote Quick Reply Share with Facebook
post #9 of 26 Old 05-06-2014
Senior Member
 
Join Date: Dec 2013
Posts: 326
Thanks: 5
Thanked 24 Times in 23 Posts
Rep Power: 2
 
Re: Topping lift loads?

Quote:
Originally Posted by Alex W View Post
My main sheet is left adjusted so that it is slightly longer than the leech of my sail, and so it is slack when you are out sailing.
Alex, I assume you meant to say that your topping lift is left adjusted slightly longer than the leech, not your main sheet, correct? If not, could you clarify?
IStream is offline  
Quote Quick Reply Share with Facebook
post #10 of 26 Old 05-06-2014
Senior Member
 
Join Date: Jan 2011
Posts: 181
Thanks: 1
Thanked 4 Times in 4 Posts
Rep Power: 5
 
Re: Topping lift loads?

I recall times when I or someone else happened to be up on the cabin while flaking the main while the mainsheet was eased, just when some power boat wake comes by and rolls the boat. Loosing balance grabbing the boom, and sometimes swinging almost over the rail. Full weight of one crew member on the little topping lift.

That stress is still less than someone hardening down on the mainsheet while the topping lift is not eased. Keeping with a line that can take 1000+ lbs of load would be a good bet.

If you use the boat hard and want to get through heavy weather without incidents, oversize everything.
SailingJackson is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

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:
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:
OR

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.




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
Topping Lift sehopkins Learning to Sail 16 05-04-2015 06:56 AM
Topping lift? themotorman General Discussion (sailing related) 13 11-20-2009 11:34 AM
Topping lift denby General Discussion (sailing related) 82 05-16-2008 09:18 AM
topping lift wumhenry Learning to Sail 24 08-04-2007 02:19 PM
Topping Lift jkrug Gear & Maintenance 18 05-04-2007 09:07 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