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 Loos gauge reading?		  New Topic  Topic Locked
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goran
Deckhand

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11 Posts
Initially Posted - 06/24/2008 :  09:00:51  Show Profile
Hi to all,
I have Catalina 25 1986. standard.
Anybody know Loos gauge reading?
The Forestay -
The Backstay -
The Upper Shrouds -
The Forward Lower Shrouds -
The Aft Lower Shrouds -

I found those:
28 on the uppers and 23 on the lowers

Thank you in advance.
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GaryB
Master Marine Consultant

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USA
4303 Posts
Response Posted - 06/24/2008 :  11:10:05  Show Profile
I set my uppers to 28-30 the other day based on inputs from forum members and that seemed fine. I set my lowers at 23-26 and they were too loose. Adjusted under sail to just snug up the leeward lowers on each tack.

You will have to use a Loos #90 for the uppers and a #91 for the lowers.
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Bruce Baker
Captain

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USA
402 Posts
Response Posted - 06/25/2008 :  09:33:09  Show Profile
Two comments on this:
1. The readings on Loos gauges vary, depending upon gauge (model 90 or 91) and upon cable diameter. It makes more sense to think in terms of pounds of tension. Here is a website that discusses tensions. A setting around 15% of breaking strength seems about right for your forestay, (non-adjustable) backstay and upper shrouds.

http://www.mauriprosailing.com/Loos-Co/Loos-PT-sailboat-tension-gauges.htm


2. Rig tension should be a function of windspeed. My J-Boat friends tension their rigs before every race. With the crappy original equipment turnbuckles on my C-25, I don't bother to do that, but I set them assuming that my prevailing wind conditions will be on the softer side.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 06/25/2008 :  09:53:58  Show Profile  Visit Frank Hopper's Homepage
Much like the Pirate's Code, settings are more of a guideline.
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Dustysailz
1st Mate

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USA
85 Posts
Response Posted - 06/25/2008 :  20:13:30  Show Profile  Visit Dustysailz's Homepage
I read once, I think an owners manual that the upper shrouds should be tensioned so that they deflect no more than one inch when the arm is extended at shoulders height and the lowers should be tensioned less than the uppers. A few years they were tensioned just a little bit tighter with no slack on the leeward side of the boat. Now I follow the above method and find that I point really well and gained some speed as well. The lowers always have some slack on the leeward side while on a reach or tack. I have seen one boat tensioned so tight that the mast didnt survice and have heard of another who tensioned the shrouds so tight, they went through the top of the cabin. Good luck and happy sailing.








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Renzo
Admiral

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USA
621 Posts
Response Posted - 06/26/2008 :  09:00:29  Show Profile
As others have said here, there is no "one size fits all" setting for rig tension. Start with 28 uppers and 23 lowers and then go sailing a few times in different wind conditions and note down how the boat handles: how high it points, how well it handles down wind. how fast it goes on a beam reach, etc. Then re-tension the rig, slightly, and go sailing again to see if there are any differences. Keep written records of the tension readings and performance, and eventually you will find the best setting for your boat and the conditions that you sail in. Then spend the rest of you life trying to improve on it!

The art and science of sailing is in rig tuning and sail trim. It is what separates us sailors from the rest of the mere mortals who blunder about on the water looking for the nearest restaurant/bar where they can show off their latest status symbol trying to impress young girls until the next pilgrim with a bigger boat or a higher flying bridge shows up. Meanwhile the true sailor will be sipping a beer in dock going over his rig and sails, inch by inch, looking for imperfections and reliving his most recent sail as his mind delves into the structure of his boat and his soul moves one step closer to becoming one with the wind and the waves.

Have fun with your Loos gage!
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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.