Adjustable Backstay? - SailNet Community
 
LinkBack Thread Tools
post #1 of 6 Old 08-15-2008 Thread Starter
Junior Member
 
Join Date: May 2008
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Adjustable Backstay?

Hi

I have a split ("y") backstay that I would like to add a simple tensioner / fidle block too. It is for a tophat 25 and some do and some don't already have this in place.

I just want to learn if I need to consider addition stress this will add to the rig and if I need to be careful or if this is no more than standard stress anyhow...

Can I just add a tensioner or do I need to modify the rig to suit?

Any thoughts appreciated.

Cheers


Karl
lrak is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 6 Old 08-15-2008
Senior Member
 
mikehoyt's Avatar
 
Join Date: Nov 2000
Posts: 687
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 15
 
Try Mike Quill's rigging shop web site. you can find thru Google search. there is a forum on that site and it is a great place to ask this question.

Mike (not Quill)
mikehoyt is offline  
Quote Quick Reply Share with Facebook
post #3 of 6 Old 08-15-2008
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 14 Times in 12 Posts
Rep Power: 14
         
Is your boat a fractional rig or masthead rig? If it is a fractional rig, an adjustable backstay would make sail shape control a lot better, and provided you don't use gorilla tactics to adjust it, probably not strain the rig much. You should probably consult with a rigger to review your rig and check to see it will handle a backstay adjuster. You could do the back stay adjuster in one of two ways. The first is to put a block at the bottom of the center section fo the backstay and then run a wire from one chainplate, through the pulley to a block and tackle that is attached to the other chainplate. With a four-to-one block and tackle, this would give you an 8:1 mechanical advantage in adjusting the backstay. The other is to use a backstay tensioner that rides on the two sections of the split backstay and has a block and tackle to adjust its height and the backstay tension.

Here are images of the two types:
Type 1:


Type 2:

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #4 of 6 Old 08-16-2008 Thread Starter
Junior Member
 
Join Date: May 2008
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Thanks guys - it is a masthead rig... I will read those links... thanks
lrak is offline  
Quote Quick Reply Share with Facebook
post #5 of 6 Old 08-16-2008
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 14 Times in 12 Posts
Rep Power: 14
         
An adjustable backstay for a masthead rig isn't as useful. It just isn't, because of the fact that a masthead rig mast won't bend the way a fractional rig does.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #6 of 6 Old 08-16-2008
Senior Member
 
Join Date: Aug 2006
Location: Norway
Posts: 856
Thanks: 8
Thanked 63 Times in 58 Posts
Rep Power: 9
 
An adjsutable backstay mastheaded rig can give the same possibilities to adjust the bend of the mast as on a masthead rig.

But to make this possible you will need a masthead fitting on the mast where the attachement of the backstay are placed some inches (6?) further aft than the aft wall of the mast section. These masthead fittings are also angled so the aft part sits higher than the forward part.

Mastheaded rigs must always have a basic trim with a litle bit of prebend to avoid the mast beeing bent the wrong way.

So when the rig is set correctly and the rigth astehad fitting is in place adjustable backstay gives the same possibility to adjust the curve of the mast.

On my Benetau First 38 fitted with a hydraulic backstay tensioner it no problem bending the mast the correct way.
knuterikt is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

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
Adjustable Backstay B49 kawabonga Beneteau 0 02-06-2008 10:04 PM
Adjustable backstay help, please? bobmcgov Gear & Maintenance 10 01-25-2008 01:41 PM
non-insulated backstay HF antenna for metal boat jimthom Cruising & Liveaboard Forum 0 05-31-2007 04:54 AM
Adjusting the Backstay Dan Dickison Seamanship Articles 0 08-07-2002 08:00 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