Rear Stay adjuster - SailNet Community
 2Likes
Reply
 
LinkBack Thread Tools
post #1 of 16 Old 03-21-2013 Thread Starter
Superior Sailor
 
Squidd's Avatar
 
Join Date: Sep 2011
Location: Eagle River Wi.
Posts: 978
Thanks: 6
Thanked 9 Times in 8 Posts
Rep Power: 4
 
What is the Purpose of the Rear Stay Adjuster

I mean what is the advantage...? I have seen single line hydraulic pull downs, glorified turnbuckles with big wheels, and all sorts of contraptions to "squeeze" a split rear stay...



What for and when do you yank it...??


I should mention I have a masthead rig and split back stay with no known adjuster...

so question is do I "need" one...?


(picture not mine)
Attached Thumbnails
SternPic.jpg  

"Might as well take 'er out...If anything is gonna happen...It's gonna happen out there..."
"Captin Ron"

Last edited by Squidd; 03-21-2013 at 10:14 AM.
Squidd is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 16 Old 03-21-2013
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,518
Thanks: 104
Thanked 309 Times in 299 Posts
Rep Power: 10
     
Re: Rear Stay adjuster

If you have a split backstay you could easily add the rig shown in your pic, what you'll gain is better forestay tension, less sag and better pointing.

Whether you care or not depends of if you race, or if you have to sail to windward routinely - then the few degrees can translate into big gains, better VMG and that last park buoy....

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 #3 of 16 Old 03-21-2013
Senior Member
 
BarryL's Avatar
 
Join Date: Aug 2003
Location: Long Island, NY
Posts: 1,789
Thanks: 4
Thanked 43 Times in 38 Posts
Rep Power: 12
 
Re: Rear Stay adjuster

Hey,

The backstay adjuster is used to control forestay tension and main draft position.

When sailing down wind you want to ease the backstay to allow the mast to move forward. This allows a spinnaker to project more sail area.

When headed upwind you don't want the headstay to sag. By tightening the backstay the headstay will get tighter and you will point better. As the wind starts to increase, tensioning the backstay more will move the draft of the mainsail forward so you get less heel and more forward drive.

The boat I race on has an adjustable backstay. The first unit was a threaded rod and a ratchet handle. That unit worked, but was slow and cumbersome to use. The owner upgraded to a hydraulic unit that it much easier to use. Note that the total adjustment is just a few inches from full slack (doing downwind in light air) to full on (going upwind in 20+ kts of wind).

Good luck,
Barry

Barry Lenoble
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BarryL is offline  
Quote Quick Reply Share with Facebook
post #4 of 16 Old 03-21-2013 Thread Starter
Superior Sailor
 
Squidd's Avatar
 
Join Date: Sep 2011
Location: Eagle River Wi.
Posts: 978
Thanks: 6
Thanked 9 Times in 8 Posts
Rep Power: 4
 
Re: Rear Stay adjuster

Is it a constant tension (I could set in the rigging) or just when you need it (add a little trim wise?)

(Barry answered part of that while I was typeing)

"Might as well take 'er out...If anything is gonna happen...It's gonna happen out there..."
"Captin Ron"
Squidd is offline  
Quote Quick Reply Share with Facebook
post #5 of 16 Old 03-21-2013
Senior Member
 
Join Date: Dec 2012
Location: new england
Posts: 2,252
Thanks: 52
Thanked 43 Times in 40 Posts
Rep Power: 3
 
Re: Rear Stay adjuster

this will bend the mast and move the top of it aft. That causing the forestay to be tighter and move the center of effort of both the main and jib forward while taking out draft. Want it loose in light air and tight in a breeze in general. Great piece of kit to have. easiest to use with fractional rigs, good with masthead, harder with old style cutters.

s/v Hippocampus
Outbound 46
outbound is offline  
Quote Quick Reply Share with Facebook
post #6 of 16 Old 03-21-2013
Tundra Down
 
downeast450's Avatar
 
Join Date: Jan 2008
Location: Seal Harbor, Maine
Posts: 1,274
Thanks: 50
Thanked 21 Times in 20 Posts
Rep Power: 8
 
Re: Rear Stay adjuster

Faster,

Can you differentiate between its use on masthead and fractional rigs? We use one and the added tension adjustment to the head stay makes a difference on our masthead rig. We know it is too tight when the person in the head can't open the door and get out!

Down

Last edited by downeast450; 03-21-2013 at 11:32 AM.
downeast450 is offline  
Quote Quick Reply Share with Facebook
post #7 of 16 Old 03-21-2013
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,518
Thanks: 104
Thanked 309 Times in 299 Posts
Rep Power: 10
     
Re: Rear Stay adjuster

Backstay on a frac is more about mast bend/flattening main.. in fact without jumpers there's not a lot of change to forestay tension.. that's the job of 'runners' and checkstays (which also control overall mast bend, esp on masthead rigs)
downeast450 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 #8 of 16 Old 03-21-2013
4ksb specialist.
 
SHNOOL's Avatar
 
Join Date: Jun 2007
Location: East Stroudsburg, PA
Posts: 1,555
Thanks: 11
Thanked 71 Times in 67 Posts
Rep Power: 9
 
Re: Rear Stay adjuster

Faster.... I always thought on us Mastheads it was also about headstay sag. You sag it out for more power just off wind, bring it up with more wind and when you are beating to windward. It also helps with rake, and also bend to an extent (not much).

I know with my lowers properly set, I can sag out the headstay with little backstay on, and my aft lowers are tight... but as I bring in the backstay, the forward lowers tighten, aft ease off some, and the forestay really starts to twang. halyard that reaches 8-10 inches aft while hanging a bob at start, to 12-14 inches after full on.

As the wind picks up you can really feel a difference in point as you tension up on the backstay... also in light air, or downwind you can feel the power come back as you back off the backstay... its small and you have to look for it, but it does show itself.

"Rum Line" an S2 7.9 - cheap, fast, trailerable, and paid for.
SHNOOL is offline  
Quote Quick Reply Share with Facebook
post #9 of 16 Old 03-21-2013
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,518
Thanks: 104
Thanked 309 Times in 299 Posts
Rep Power: 10
     
Re: Rear Stay adjuster

Quote:
Originally Posted by SHNOOL View Post
Faster.... I always thought on us Mastheads it was also about headstay sag. You sag it out for more power just off wind, bring it up with more wind and when you are beating to windward. It also helps with rake, and also bend to an extent (not much).
Post #2 above...

Quote:
Originally Posted by Faster View Post
If you have a split backstay you could easily add the rig shown in your pic, what you'll gain is better forestay tension, less sag and better pointing...
Don't think we're disagreeing here...

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 #10 of 16 Old 03-21-2013
Senior Member
 
SchockT's Avatar
 
Join Date: May 2012
Location: North Vancouver, BC
Posts: 1,428
Thanks: 1
Thanked 27 Times in 25 Posts
Rep Power: 4
 
Re: Rear Stay adjuster

On mashead boats the type of mast section you have will determine what effects backstay tension has. If you have a cruising boat with a big stiff "tree trunk" mast section, the main benefit will be forestay tension, which is a good adjustment to have. If your mast is more performance oriented like the tapered Sparcraft mast on my boat, you get the added bonus of being able to bend the mast, which will flatten your mainsail. It should be noted that mast bend does NOT change your draft position (much). Draft position is controlled by halyard/cunningham tension. Mast bend changes the depth of the draft.
SVAuspicious likes this.

1979 Santana 30 Tall Rig
Hull#101
SchockT 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
Westerbeke W30 (4-91) rear oil leak sanibel sailor Diesel 10 11-05-2011 05:58 PM
What's that "rear stay" on a gaff rig? GregX999 Learning to Sail 9 08-05-2009 10:40 AM
Less 30' with a head in the rear quarter? scottchop Boat Review and Purchase Forum 29 12-01-2008 10:23 PM
Yanmar smoking out rear marinesniper Gear & Maintenance 5 07-26-2008 07:05 AM
Rear Seal Replacement tm3 Gear & Maintenance 2 01-07-2004 03:30 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