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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Loose shrouds
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Thread: Loose shrouds Reply to Thread
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Topic Review (Newest First)
10-30-2013 03:02 AM
RichH
Re: Loose shrouds

Here ya go for directions of a 'plain vanilla' rig tune up: http://www.riggingandsails.com/pdf/selden-tuning.pdf - note the section of fine tuning rig tension WITHOUT a tension gage, just a meter stick and some tape.

The above is probably the most comprehensive rig tuning guide available on the net. Plus, I suggest that your follow Faster's advice about the loose shrouds at 20+kts. .... BUT then mark the turnbuckles and remeasure the static tension when at the dock AND with the boat pulled over by its masthead to the approximate heel angle as when in 20% knots, etc. as you dont want your rigging to continually exceed 30% of ultimate tension ... leads to 'fatigue' and that greatly lowers the service life of the rigging and its components. Just use a halyard, and pull the boat over to that heel angle and then take your reading on the meter stick - you dont want the tension (preloaded static tension plus additional tension that causes the heeling) at that max. heel angle to much exceed 30%. No need to exceed 45° heel angle when artificially heeling the boat over with a halyard - because of 'trigonometry'
10-30-2013 02:44 AM
DrB
Re: New Rigging

Quote:
Originally Posted by Faster View Post
I'm guessing you meant to say that no shroud should be loose/wobbly...
Yes, thanks for the catch. I corrected it.
10-30-2013 02:39 AM
Faster
Re: New Rigging

Quote:
Originally Posted by DrB View Post
Some folks may disagree with this, but no shroud should not be loose/wobbly. .......

DrB
I'm guessing you meant to say that no shroud should be loose/wobbly...

Generally agree, but in reality it's not unusual for a leeward shroud to go visibly slack in 20+ knots of wind, and expect that an awful lot of boats will fall into that category without risk of imminent failure..

The OP isn't concerned about the last degree of pointing or 1/4 knot of speed, so he's probably OK.. but going through the exercise of removing some of that slack would be a good thing..
10-30-2013 02:21 AM
DrB
New Rigging

Some folks may disagree with this, but no shroud should be loose/wobbly. When you get new rigging, they do it on land and the boat isn't in it's proper shape. It needs to be in the water for a few weeks before the final tune is done.

When properly tuned, when sailing in a light breeze and heeled, the leeward shrouds should not have any flop or sag in them. If you can move the shrouds without much effort with your hand, they need to be tensioned. Your mast should remain straight even in moderate/strong breezes. Having the shrouds too loose will allow the mast to flex when loaded.

The rigger should be able to properly fine tune your rig if you don't feel comfortable doing it yourself. It's not that hard, but it does require a few steps.

DrB
10-30-2013 01:19 AM
blt2ski
Re: Loose shrouds

You will also find that the rig will loosen or stretch after some use. SO you may have the end result of this too. You can get a cheap "Loos" guage from Fisheries or WM. You will probably need the smallest of the three. I will swag $20-40. Then next better one is just over $100, but more accurate.

The folks at Ballard sails may have a general how to tune you rig. As many sail makers do. I have one from Ullman. There is a sticky on here with a general how to tune a rig too. Helpfull to have a rig centered and the rig tensioned correctly. If it is not, you may not point as high, nor get the max speed out of the boat too!

marty
10-30-2013 01:13 AM
matthewwhill
Re: Loose shrouds

Its a Kent Ranger 24 (Ray Richards designed, not the Gary Mull southern California Ranger). Displacement is 3000 pounds with 1300 pound ballast. Sail area / displacement ratio I think is 17.8.

Although I do realize that the rig is what supports the mast, I guess I was just wondering whether a newly installed rig which may not be tuned perfectly presents a risk of catastrophic failure.
10-30-2013 01:03 AM
PaulinVictoria
Re: Loose shrouds

Having the rig set up properly is a safety deal, it's what holds your mast up In 20kts then I am not surprised the shroud looked rather loose, doesn't sound like you have anything to worry about though.
What boat do you have?
10-30-2013 01:00 AM
matthewwhill
Re: Loose shrouds

Ah... Sailnet helps once again.

No I didn't have CSR tune the rig. I'll have to look at the invoice to get the size of the wire.

I am not a racer, so speed is not really as important to me as safety.

If we assume that the rig is not in tune and the shrouds are a bit loose, is this a big safety risk?

I was just out in 20 knot winds with gusts to 25+. Seemed fine with a reef in the main.
10-30-2013 12:55 AM
Faster
Re: Loose shrouds

Did you have CSR 'tune' the rig? Or just replace the rigging? The final tensioning/tuning is usually done under sail to ensure the rig is true under load.. Maybe get some help with that.

The tensioning tool is, ironically, called a "loos" gauge, there are tow sizes, guessing you'd want the smaller...
10-30-2013 12:52 AM
PaulinVictoria
Re: Loose shrouds

1. Normally the initial adjustment is done based on a percentage of the breaking strength of the wire. They are indeed adjustable, and you can tune them for different wind strengths. What size are the wires?
2. Yes, Loos gauges are the most common.
3. Can't help you there, but they aren't that expensive.
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