Rig tuning help - 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 > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 04-23-2009
zz4gta's Avatar
I don't discuss my member
 
Join Date: Aug 2007
Location: Chesapeake Bay
Posts: 2,444
Thanks: 0
Thanked 16 Times in 16 Posts
Rep Power: 8
zz4gta is on a distinguished road
Rig tuning help

Ok, so I have a Merit 25, very similar to a j24. Rigs are very similar but the merit has a 15/16 factional rig. The rig is made up of the following:

Forestay
Cap shrouds (chain plates up to the masthead)
Lowers (tie into same chainplate as cap shrouds)
aft lowers
adj. backstay

I had an aft lower and a cap shroud made over the winter (slowly replacing old rigging with new) and now that the mast is up, all is well, sorta. Things are pretty snug (I have no gauge) the lowers are tighter than the cap shrouds. The aft lowers a little loose to allow mast bend with backstay on. Sighting up the mast it looks like my mast is bending to leeward above the shrouds while sailing. Does this mean I should add more cap shroud tension to hold it in column? Only rig tuning I can find that is Merit specific is below:

Quote:
Fishmeal's Algorithm for Tuning the Rig:

1) Loosen everything, and make sure there are no twists in the wires.
2) Set headstay length to be slightly longer than the current class
champ.
3) Tighten the uppers until you are afraid something might break,
making sure that the masthead is centered (use tape measure from main
halyard, wind must be nearly calm).
4) Tighten lowers to about 2/3 tension of uppers, sighting up sail
track to keep mast in column.
5) Tighten backstay until you are afraid something will break.
6) Adjust aft lowers for desired mast bend.
7) Go sailing. If uppers on leeward side go slack in less than 15 knots
of wind, they are too loose.
8) Adjust lowers so that mast bends only in vertical plane (check by
sighting up sail track).
9) If you have ever seen a boat of the same size and type with less
headstay sag, then the backstay is too loose.
10) Tighten aft lowers if you need a fuller main, loosen if you need
a flatter main.
Not exactly the technical approach I was looking for. My only other option would be to mimic the j/24 tuning guides and buy a loos gauge. Which brings me to my next question. I know a digital gauge is obviously a lot easier to use, but I've seen some analog gauges for hundreds less. Can I get similar results with a analog? Or should I just poney up the boat bucks for the digital (especially if I'll be racing)?

Thanks for any insight.
__________________
Merit 25 # 764 "Audrey"

Last edited by zz4gta; 04-23-2009 at 09:23 AM.
Reply With Quote Share with Facebook
  #2  
Old 04-23-2009
tommays's Avatar
Senior Member
 
Join Date: Sep 2008
Posts: 4,248
Thanks: 1
Thanked 25 Times in 25 Posts
Rep Power: 7
tommays will become famous soon enough
The loos guage is fine

You will break the boat before you dont get slack on the leward side

I dont know your wire size BUT on the J24 upper 30 is freaking tight and you still get slack

The headstay on this mast should be able to get on the silly lose side in light winds and get tighter as wind speed goes up using the backstay adjustment

The tuning guides are USELESS unless you own that SAIL as they set the mast up for how it was CUT with the current correct J24 being settings being compleatly different than the old ones
__________________
1970 Cal 29 Sea Fever

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

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by tommays; 04-23-2009 at 09:44 AM.
Reply With Quote Share with Facebook
  #3  
Old 04-23-2009
zz4gta's Avatar
I don't discuss my member
 
Join Date: Aug 2007
Location: Chesapeake Bay
Posts: 2,444
Thanks: 0
Thanked 16 Times in 16 Posts
Rep Power: 8
zz4gta is on a distinguished road
Ok, so I'll always have slack on the leeward side to some extent. But should the top half of the mast be bending to leeward? Or should that be adjust to keep it straight under load?
__________________
Merit 25 # 764 "Audrey"
Reply With Quote Share with Facebook
  #4  
Old 04-23-2009
Senior Member
 
Join Date: Oct 2006
Location: Virginia
Posts: 722
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
badsanta is on a distinguished road
ZZ, I have the analog gauge. If you want to borrow it give me a call. I will be in colonial beach this weekend.
__________________
That derelict boat was another dream for somebody else, don't let it be your nightmare and a waste of your life.
Reply With Quote Share with Facebook
  #5  
Old 04-23-2009
tommays's Avatar
Senior Member
 
Join Date: Sep 2008
Posts: 4,248
Thanks: 1
Thanked 25 Times in 25 Posts
Rep Power: 7
tommays will become famous soon enough
My jib haylard is centered and i use that to measure down the to the chainplates to get the mast centered and then start going at the uppers and lowers a bit at a time while using the main haylard to see if the mast is straight and how much prebend it has


On my mast there is a good chunck of it above the uppers and if its straight
when things are tight and your not sailing then it is going to move a bit when your are
__________________
1970 Cal 29 Sea Fever

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

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #6  
Old 04-23-2009
Senior Member
 
Join Date: Apr 2003
Posts: 4,192
Thanks: 50
Thanked 37 Times in 36 Posts
Rep Power: 14
knothead has a spectacular aura about knothead has a spectacular aura about knothead has a spectacular aura about
Quote:
Originally Posted by zz4gta View Post
Things are pretty snug (I have no gauge) the lowers are tighter than the cap shrouds.
Unless the diameter of the lower shrouds is larger than the upper shrouds, they shouldn't be set up tighter. In my opinion.
Reply With Quote Share with Facebook
  #7  
Old 04-23-2009
ASA and PSIA Instructor
 
Join Date: Apr 2000
Posts: 3,448
Thanks: 6
Thanked 17 Times in 17 Posts
Rep Power: 15
sailingfool will become famous soon enough
Properly tuned, the uppers will always have more tension than the lowers, as they need to carry more load. Uppers will often be one wire size up from lowers.

Sounds like your uppers are too loose, tighten them a turn at a time, on alternate tacks, until the mast stays in column. While there will always be "some" leeward slack in rigging, if the stays are loose enough to flop about, then adjust uppers/lowers together until the rig shows just a "little" leeward slack.

I see little value for a guage for the annual tuning of a cruising rig, if the rigging isn't keeping the mast incolumn, you tighten the stays until they do. A gauge is an important tool for racers who tune the rig to match specific conditions, where a gauge lets that change be done dockside.
__________________
Certified...in several regards...

Last edited by sailingfool; 04-23-2009 at 05:02 PM.
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
Ketch vs Sloop? bobmcd Boat Review and Purchase Forum 44 09-27-2012 10:43 AM
Sloop, Cutter or Ketch jsgsail Boat Review and Purchase Forum 17 12-26-2008 02:47 PM
My First Boat...Boat Term Question... Kacper General Discussion (sailing related) 38 09-23-2008 06:52 PM
Sloop or Ketch? maxheadspace Boat Review and Purchase Forum 46 07-27-2007 02:56 PM
Yawl Info Needed sailortonyb1 Boat Review and Purchase Forum 5 01-18-2006 04:51 AM


All times are GMT -4. The time now is 05:50 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.