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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 25 Specific Forum
 Shroud and stay tensions		  New Topic  Topic Locked
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steephen
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100 Posts
Initially Posted - 05/04/2004 :  20:06:50  Show Profile
Anyone out there familiar with the Loos gauge for tightening the stays? Are there specific numbers for the C-25 thaqt anyone uses?
Got the mast up this weekend, and re-installed the keel with a new pin carriage. Not difficult at all...

Stephen Z.
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mroettersr
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USA
148 Posts
Response Posted - 05/05/2004 :  00:33:29  Show Profile
Stephen,
There was an excellent article in the April 2004 issue of Sailing (not Sail) magazine on rig tuning. You might find a copy in your local library. I checked their web site a few weeks ago to see if they posted it and it wasn't there. www.sailingonline.com Some of the highlights - ". . . the longer the wire the more tension we want on it."; "To do a rough tune, tension each wire to roughly 10% of its tensile strength .... it will be just tight enough to resonate when struck." ; "Using a tension gauge we will tension the wire as follows: the lowers will be set to 10-12 percent of maximum wire strength, .... the uppers to 15-20 percent. You can find the tensile strength of a given wire in any rigging catalog or reference book." The author also describes proceedures for being certain the mast is straight, etc. The author uses a Loos gauge for setting tension but didn't give numbers as the article was generalized for all boats. I haven't had time to look into the tensile strength of my rigging to extablish tension settings. Hope this helps.
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takokichi
Captain

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USA
321 Posts
Response Posted - 05/05/2004 :  10:16:46  Show Profile
Stephen -

If you'd like I'd be happy to help you tune your rig. I have a Loos gauge but rarely use it. I set the boat up at the dock (or in the yard, preferably) then tune it by sailing and adjusting until I'm happy. We're not quite there yet with this year's tune but we're getting close.

Justin
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 05/05/2004 :  12:55:45  Show Profile
Which style of the Loos gauge do you own - standard or professional?
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Derek Crawford
Master Marine Consultant

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USA
3323 Posts
Response Posted - 05/05/2004 :  18:32:06  Show Profile
I tune "This Side Up" looser than (probably) anyone else on this forum so I'll keep quiet! When I retuned Gary B's rig for the Six-Pak last year (and I still kept it tighter than mine) he was amazed at the difference that it made (especially off the wind).
Derek
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steephen
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100 Posts
Response Posted - 05/05/2004 :  21:25:06  Show Profile
OJ:

I have Model B, Loos part #90. Are the numbers on the back tension in pounds? The numbers on the scale itself go from 5 to 50 but are without units. I think I see it now. You take a percentage (15%) of the breaking stregnth of each cable, in pounds, and that corresponds to the scale numbers on the gauge. Does this mean it doesn't matter how long the stays are, just the diameter counts?

Stephen Z
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mroettersr
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USA
148 Posts
Response Posted - 05/06/2004 :  01:06:49  Show Profile
It looks like two Loos gauges are required as our lower shrouds are 5/32" requiring the model 91 and the uppers are 3/16" requiring the model 90. It appears the Loos gauge setting for the lowers would be 39-41 (model 91). I don't have a model 90 and have no idea what setting would be used for the uppers. I'm going to fool around with the math to see if the model 91 can also be used for the upper shrouds or if it is off the scale.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.