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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 250 Specific Forum
 Loos PT-1 tension guage		  New Topic  Topic Locked
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Capt. Kurt
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185 Posts
Initially Posted - 04/13/2005 :  11:03:23  Show Profile
I picked up a Loos tension guage to take the guess work out of setting up my rigging. I searched online and this site but could not find recommended tension values for the C250. Its a pretty commonly used guage among one design sailers from what I've been told. Does anyone use a Loos PT-1 tension guage? What do you recommend for the shrouds and stays?

The Loos manual recommends 15-20% of max load cap. for upper shrouds on a fractional rig, does this sound right? 5/32 = 3300lbs, so 600lbs on upper shrouds seems excessive...

This is what it looks like:
http://www.westmarine.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10001&productId=72023

Thanks,
Kurt
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s3tbuell
1st Mate

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47 Posts
Response Posted - 04/13/2005 :  13:42:55  Show Profile
I too got a gauge and just went with the manuals recommendations.
I found that my boat handled much better and seemed to be faster(sure a 250 fast). The bad news was I told a friend who has a Mac26 how much better my boats performance was. I could sail circles around him. Not anymore, he borrowed my gauge and well good thing he a friend…
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Jeff McK
Captain

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USA
389 Posts
Response Posted - 04/17/2005 :  16:26:21  Show Profile
Kurt,

Refer to section 4.1.2 in the owners manual.
There is a table of Loos gauge readings at the bottom: Backstay 32, upper shrouds 35, lower shrouds 20. FORESTAY 24*

*A <font color="red"><i>CRITICAL</i></font id="red"> detail: The backstay & shrouds are 5/32" and the forestay is 3/16". This means you will need to use the smaller one (model 91) on the shrouds & backstay and the larger one (model 90) on the forestay only.

The model 90 is calibrated differently, so while it will fit on the smaller wires, the readings you will get will be wrong if used on the smaller wires. The 91 will not fit on the larger wire.
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Capt. Kurt
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185 Posts
Response Posted - 04/18/2005 :  17:25:17  Show Profile
Thanks Jeff, I'm surprised I missed that in the manual!

Kurt
#818 C250WK 'Tortuga'
Edited by - Capt. Kurt on 04/18/2005 17:28:23
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Tom Potter
Master Marine Consultant

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USA
1913 Posts
Response Posted - 04/18/2005 :  20:06:14  Show Profile
I was just looking in my owners manual and section 4.1 is the "Plumbing Plan" . There is a "Mast Tuning" section but its section 1.2. and theres nothing in that section with Loos gauge readings. It just says that "rigging tentions may be measured with a Loos model B tension guage". I'm thinking about getting a Loos myself just to take the guess work out of it. Thanks for putting the numbers up. That gives me a starting point.
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frog0911
Master Marine Consultant

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USA
1349 Posts
Response Posted - 04/18/2005 :  20:59:00  Show Profile
My manual is the 5th edition and the Loos numbers are in section 4.1.2 under the heading "Tuning the Mast (Catalina 250)". You might check the edition of your manual, since your boat is a earlier model.
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Tom Potter
Master Marine Consultant

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USA
1913 Posts
Response Posted - 04/18/2005 :  21:06:29  Show Profile
Thanks Jerry,
Thats it, I have the second edition 7-24-96. I don't think there should be any differences in the tension numbers do you?
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Steve Raffel
Captain

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262 Posts
Response Posted - 04/30/2005 :  15:25:24  Show Profile
Is it correct to assume we're talking about Loos tension gauge models PT-1 and PT-2? I note the Catalina manual talks about Models A and B. There is a mention of Models 90 and 91 in this discussion.

The other question I have is how do you measure the forestay tension with the furler covering the wire?
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Capt. Kurt
Navigator

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185 Posts
Response Posted - 05/06/2005 :  20:49:45  Show Profile
Just for the record..

According to the Catalina manual for Loos Guage Model A (5/32 dia) the scale settings are:
Backstay 32
Upper shrouds 35
Lower shrouds 20

According to scale conversion table in Loos PT-1 Manual from Model A below:
Backstay ~23
Upper shrouds 25
Lower shrouds ~16 (best-guess)

Is this right?



Forestay required PT-2 because its 3/16 dia., which would be 19 scale for PT-2 (Model B = 24 ).

Kurt
C250WK #818 'Tortuga'
Edited by - Capt. Kurt on 05/06/2005 21:05:49
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Tom Potter
Master Marine Consultant

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USA
1913 Posts
Response Posted - 07/01/2005 :  21:47:49  Show Profile
Well after buying the wrong Loos gage off E-bay a model A 91 for 5/32. I found out I have 3/16 shrouds. Must have something to do with being a tall rig. I finely found a model B 90 on E-bay and bought it. I headed off to the boat this afternoon try it out. Man was my guessing off . I had the upper shrouds set at 1080 The book calls for 500 pounds. I re-set the rig using the instructions that came with the Loos. 500 pounds on the uppers, I set the lowers at 380 another guess, (I'll reset them on a good wind) and set the back stay at 200.

Question Like Steve ask earlier - how do you measure the forestay tension with the furler covering the wire?
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atgep
Master Marine Consultant

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1009 Posts
Response Posted - 07/01/2005 :  22:32:23  Show Profile
Tom,

You don't check the forestay. The swept spreaders will cause the mast to bend if it is not set right.

Tom.
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existentialsailor
Master Marine Consultant

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USA
1180 Posts
Response Posted - 07/02/2005 :  06:06:30  Show Profile
Tom,

You want to get rid of the 5/32 loos, I can make use of it on my Capri. Send me an email through the forum.
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JohnMD
Navigator

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USA
207 Posts
Response Posted - 07/02/2005 :  09:10:32  Show Profile
Can someone please tell me what diameter the shrouds and rearstay wire are on a Catalina 250. It sounds like different people must have different wire sizes. Are they 3/16 or are they 5/32? It would be good to know before I invest in a Loos (89 bucks from West Marine). Thanks
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Tom Potter
Master Marine Consultant

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USA
1913 Posts
Response Posted - 07/02/2005 :  10:50:39  Show Profile
John,
My forestay is 3/16, upper and lower shrouds are 3/16, rear stay is 5/32. I have a 97 Tall Rig. Check your stays the size is printed on them near the ends, at least they are on mine. I noticed a 250 WB docked next to me has 5/32 shrouds.
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JohnMD
Navigator

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USA
207 Posts
Response Posted - 07/02/2005 :  13:08:03  Show Profile
I didn't realize it was printed on the cable ends. Fantastic information, thanks. When I check the tensions, I know I check the upper and lower shrouds. Do I check the rearstay and the forestay or just the rearstay. My owners manual doesn't say beans about anything. I think they were just figuring out the kinks back then. By the way, I have WB hull number 2. It still floats and actually looks pretty good.
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JohnMD
Navigator

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USA
207 Posts
Response Posted - 07/09/2005 :  10:34:40  Show Profile
I just bought a new Loos PT1 on clearance sale from Sailnet for 43 bucks. No, I don't work for them and I'm not advertising. They're about 85 dollars everywhere else I looked. That works well since my 95 WB has 5/32 wires everywhere but the forestay. Did:
Backstay 23
Upper Shrouds 25 and
Lower Shrouds 16
work out okay for everyone?
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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.