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Old 26-10-2009, 02:41   #16
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Aloha Georges,
The Loos gauge uses deflection in lbs in a given length of shroud. You can do the same thing by measuring the amount of lbs in a certain measurement of deflection for the total shroud. It may not be perfectly accurate but it will be close.
So, what I do is use a fish scale and pull the shroud toward the lifeline and see how far it deflects to get the fish scale up to a certain amount in lbs or kilos. Do the same on both sides of the boat until you have them nearly equal. Not guitar string taught but not loose either. You do this test while at the dock. Then take the boat sailing and see if you have the shrouds tight enough not to be flopping around on the lee side when you are close hauled.
Good luck on your tuning. Thanks for using the term shroud. One of the first questions on our exams is why sailing has a different vocabulary. It is to make ourselves clearly understood.
regards,
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Old 26-10-2009, 03:11   #17
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thanks skiprjohn
very handy indeed the fish scale
I 'll do that the next week end
fair winds to all
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Old 26-10-2009, 08:11   #18
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Google selden mast tuning and look at tuning instructions under folding rule method.

I used this method for getting the proper tension on my stays and shroads. The only wire that I could not measure was the headstay where I had roller furling.
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Old 26-10-2009, 09:27   #19
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Rig Tuning Manuals as posted at:
http://www.cruisersforum.com/forums/...ls-8758-5.html

"Hints and advice on rigging and tuning of your Seldén mast"
http://www.riggingandsails.com/pdf/selden-tuning.pdf

”Essential Rig Tuning Manual” ~ Hall Spars
http://www.rocketboats.com/pdf/HallRigTuneManual.pdf

”Rig Tuning” ~ Neil Pryde Sails
Neil Pryde Sails Owners Manual: Rig Tuning
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Old 26-10-2009, 10:57   #20
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I don't see that fish scale setup working in an accurate and reliable manner... why so difficult when the ruler method is so easy? All you need to remember is that your capshrouds should be tensioned to 15-20% of breaking strength of the wire (some swept-spreader rigs up to 25%) and that each 5% equals a stretch of 1 mm over a 2 meter section of wire, regardless of wire diameter.

I just read that Selden manual linked above by Gord and it explains the method in detail.

But keep in mind that it is important to tension to at least 15% of breaking strength for any rig and it is absolutely crucial for rigs with aft-swept spreaders.

cheers,
Nick.
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Old 26-10-2009, 13:14   #21
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I'll agree that simpler is better.
regards
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Old 26-10-2009, 13:54   #22
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Ok so 1 lower shroud is slack and the other one tight! is the same with the boat at the dock?? no cracks in the chainplate??

Some one made a rig job in the past?
Start a rig tune from a scracht and be sure that chainplates and tangs are sound, and for rig tension keep in mind ,mast need to be straight under loads.
Cheers.
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