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 raising the mast		  New Topic  Topic Locked
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T8BECKHAM
Deckhand

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USA
24 Posts
Initially Posted - 07/26/2011 :  19:29:46  Show Profile
I have read the manual about raising the mast. is there a loos gauge number that would be close? hope to get it in the water tommorrow.
tate beckham
Tate Beckham
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T8BECKHAM
Deckhand

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USA
24 Posts
Response Posted - 07/26/2011 :  19:32:29  Show Profile
Sorry- I am talking about the shroud and stay tension.

tate beckham
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Voyager
Master Marine Consultant

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USA
5377 Posts
Response Posted - 07/26/2011 :  19:41:44  Show Profile
Tate,
Lots of discussions on tightening your stays and shrouds, so the "search" function will return lots of hits. Bottom line, most people tighten their rigs "by ear" or by feel somehow. When I rebedded my chainplates, I used deflection under load as my guide. A Loos gauge would make it more accurate, but so far, no problems.
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pastmember
Master Marine Consultant

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2402 Posts
Response Posted - 07/27/2011 :  10:06:51  Show Profile
The Loos is just to help you get each side equal, you pick the number.
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jonfew346
1st Mate

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USA
33 Posts
Response Posted - 07/28/2011 :  13:35:29  Show Profile
The Loos does not get you equal side to side. The hlayard or a hoisted tape measure is used to check if the mast is straight. A Loos will check if everything is tentioned correctly.
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 07/28/2011 :  13:42:47  Show Profile
I think Frank was referring to the tension being the same side to side.
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pastmember
Master Marine Consultant

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2402 Posts
Response Posted - 07/29/2011 :  13:11:34  Show Profile
Yes, I use the Loos to balance the tension of the rig, I set the rake, prebend, and center the mast visually. Lots of people use a halyard to "set" their mast and it makes a lot of sense to do it that way. The point I was trying to make is that there is no certain tension you should set, you sail in your own water so you should decide how tight or loose you want your rig. I sail in a high wind area and I prefer a tight rig because I do not like a lot of leeward shroud slop and hate mast pumping. Other venues beg for a loose and arguably faster rig tension. Talk to your Wednesday night racers, they will be happy to discuss what your rig tension should be like.
Edited by - pastmember on 07/29/2011 19:00:06
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DaveR
Master Marine Consultant

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USA
2015 Posts
Response Posted - 07/29/2011 :  14:05:37  Show Profile  Visit DaveR's Homepage
I think Frank hit it dead center. The only thing I'd add if I could was the link to somebody's mast tuning guide. Had it Bookmarked I thought. Anybody got that handy?
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cshaw
Captain

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USA
460 Posts
Response Posted - 07/29/2011 :  14:07:43  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by jonfew346</i>
<br />The Loos does not get you equal side to side. The hlayard or a hoisted tape measure is used to check if the mast is straight. A Loos will check if everything is tentioned correctly.
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

The only issue I have with using a Loos is it does not take into consideration how the hull flexes when the rig is loaded (i.e. sailing to weather close hauled). Using a tape to each side will get the mast roughly perpendicular to the planform of the hull/deck side to side. After that, using something like a Loos to get to a good starting point is fine (uppers tightest, forward lowers next tightest, aft lowers the loosest). Then go sail the boat to weather in a moderate breeze and sight along it (along the mainsail groove) to verify it is still in column side to side, and either straight or with a very "slight" bow forward (i.e. spreader sockets forward of the line from the deck to the masthead).

The "rake" of the mast is adjusted with the forestay and backstay, and if you change the rake of the mast, it may change what the loading is on the forward and aft lowers.

After you get all that done (which is actually a plesant experience if you take your time and are very methodical, and do not try to do it in too much wind or with the boat overpowered), THEN, back at the dock use a Loos to measure the unloaded tensions, and write them down. Those data will be valuable to put the rig back into the same tuning if you have to lower the mast or loosen one of the shrouds or stays. You might be very surprised how non-even the tensions are when you get done.....(i.e. after the hull flex is taken into consideration). Stiffer boats change less, but older "softened up" hulls can be quite different than having side to side tensions be the same.

Cheers!

Chuck
Edited by - cshaw on 07/29/2011 14:09:06
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wegman
1st Mate

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USA
35 Posts
Response Posted - 07/30/2011 :  09:54:04  Show Profile  Visit wegman's Homepage
Bill Holcumb has written an excellent guide to tuning the rig. It is found under the technical tips area of this site. The URL is:

http://www.catalina-capri-25s.org/tech/tech25/snkmast.asp

Good luck with your new boat.
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T8BECKHAM
Deckhand

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USA
24 Posts
Response Posted - 08/03/2011 :  18:06:12  Show Profile
Thanks everyone-
T8
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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.