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Forums28
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Most Online238 Feb 9th, 2024
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Mast Set Up/Rig Tension
#491
03/07/06 09:56 PM
03/07/06 09:56 PM
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Joined: Jan 2006
Posts: 5 wichita, ks, usa
Tom Olsen
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OP
Forum Newbie
Joined: Jan 2006
Posts: 5
wichita, ks, usa
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Can anyone tell me how to properly rig the mast for racing (rig tension, rake, etc.)? We bought the boat used with a mix of sails and we don't have a sailmaker that is familiar with the J-30.
GrandLakeJ30
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Re: Mast Set Up/Rig Tension
#492
03/08/06 11:47 AM
03/08/06 11:47 AM
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Joined: Apr 2003
Posts: 649 Marblehead, MA
dbows
Senior Member
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Senior Member
Joined: Apr 2003
Posts: 649
Marblehead, MA
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Originally posted by Tom Olsen: Can anyone tell me how to properly rig the mast for racing (rig tension, rake, etc.)? We bought the boat used with a mix of sails and we don't have a sailmaker that is familiar with the J-30. I would follow the Banks Tuning guid. http://www.j30.org/html/technical/tuning_guide.html Be prepared for a ton of pressure on the shrouds. They are like a piano but it works. If you sail in light air maybe back them off a bit. I also have the UK tuning guid off the jboat site before it became unavailable. I can email that to you. David, #397
David Bows Mallorca - Hull# 397 ~~~~~_/)~_/)~~~~_/)~~~~~~~~~~~~~~~~~~~~~~~~~|~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|~~~~~
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Re: Mast Set Up/Rig Tension
#496
08/14/06 01:45 PM
08/14/06 01:45 PM
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Joined: Jun 2005
Posts: 54 Cleveland Hts., OH, USA
Blue J 503
Senior Member
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Senior Member
Joined: Jun 2005
Posts: 54
Cleveland Hts., OH, USA
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Originally posted by S. Buzbee:
Mast butt max forward, headstay class max, THEN start setting tension according to the guides.
I'm confused about "headstay class max". When I installed roller furling with a new headstay, I carefully measured and pre-set the headstay to the max. spec. This resulted in a lot of mast bend, a very loose backstay, and a lot of headstay sag in a breeze. I've now shortened the headstay an inch or so and still have lots of mast bend. How much tension is assumed when doing the class measurement for headstay length?
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Re: Mast Set Up/Rig Tension
#497
05/04/07 11:44 AM
05/04/07 11:44 AM
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Joined: Mar 2006
Posts: 36 Ottawa, Ontario, CANADA
CAN106
Senior Member
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Senior Member
Joined: Mar 2006
Posts: 36
Ottawa, Ontario, CANADA
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A follow-up question about Loos gauges. CAN-106 came to me with two: Model "PT-2" and "Model B". When the tuning guides refer to "the new style Loos gauge"....which is it?
-Corey
Corey Glynn
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Re: Mast Set Up/Rig Tension
#499
05/05/07 10:33 AM
05/05/07 10:33 AM
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Joined: Apr 2003
Posts: 649 Marblehead, MA
dbows
Senior Member
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Senior Member
Joined: Apr 2003
Posts: 649
Marblehead, MA
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PT-2 is the best. It just hangs on the shroud while you adjust.
You can follow the pounds of pressure vs the number. That is how to convert.
David #397
David Bows Mallorca - Hull# 397 ~~~~~_/)~_/)~~~~_/)~~~~~~~~~~~~~~~~~~~~~~~~~|~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|~~~~~
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Re: Mast Set Up/Rig Tension
#500
05/08/07 10:57 PM
05/08/07 10:57 PM
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Joined: Mar 2006
Posts: 36 Ottawa, Ontario, CANADA
CAN106
Senior Member
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Senior Member
Joined: Mar 2006
Posts: 36
Ottawa, Ontario, CANADA
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According to the Banks guide, the uppers are 44-45 and the lowers are 45-46. I'm prepared for a "ton" of pressure but did you really mean 2000lbs? On the Loos model "PT-2", the gauge maxes-out at 40 (2000lbs) and the model "B" maxes-out at 43 (1800lbs) for 1/4" shrouds. The Loos guide suggests that the breaking strength of 1/4" stainless is 8200 lbs and that a starting tension for the forestay on a fractional rig is 15% of breaking strength or 1230lbs. The starting tension of the shrouds on a fractional rig with swept-back spreaders is 20% or 1640lbs. Can someone comment on shroud tension in lbs instead of loose Loos #'s?
Corey Glynn
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