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Date Posted: - Friday - 06/15/12 - 8:41am
Author: Bill Kranidis
Subject: Great crossbeam idea
In reply to:
Paul M31 #106 NJ
's message, "Hand tight is a good start" on - Thursday - 06/14/12 - 11:06am
I really like what the PO of your boat did, Paul. Nice and clean installation. That, along with the original set-up, would support mast compression in pretty much any kind of seas.
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I think I've got it -- Terry Kelly, - Wednesday - 07/ 4/12 - 4:10pm
So I sprung for one of the Loos gauges; got the pro model for less than the lesser version.
Following their initial suggestions for set up, I put 650 to 700 lbs on the main shrouds and 700 lbs on the back stay.
Let her sit for a couple of days, and discovered that the head door was sticking a little. (The hanging locker door, too, but it clearly needs a bit of trimming.)
Checked the tensions and dropped them by about 50lbs at a time and now have it where the doors aren't sticking any more, and the leewards get a bit slack on a beam reach in 10kts.
Did the same sort of thing for the mizzen, with correspondingly lower numbers because of the smaller wire.
So, now I have numbers on the gauge even for both sides, and repeatable for next season.
It is true that if I had tensioned her up the way the majority of riggers tell me to, I wouldn't be able to get into the head at all!
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New tensions -- Paul M31 # 106, nj, - Thursday - 07/ 5/12 - 9:04am
When you checked the tensions with the door sticking after a few days, were they already less than what you set them at - you say between 650 and 700lbs each?
Also, when you reduced them by 50 lbs at a time - what did you end up leaving them at where the the leewards would go somewhat slack on a 10kt beam reach?
It would be interesting to compare numbers - I have a loose gauge on board as well.
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Rigging tension/deck compression -- Bill Miller, - Thursday - 07/ 5/12 - 5:21pm
Hi Guys,
This is a great discussion and I mostly agree with Paul on a compromise between shrouds being too slack and too tight that would cause deck compression. I kept tightening mine over and over until finally had to go for more support. Refer to "completed projects" main mast support. I chose to copy Bruce Allen's version of the T flange stainless beam. Quite a project but works like a dream. No sticking of head or locker doors while only losing 1 1/2" of headroom in the doorway. I feel I've got it dialed on Natsukaze and agree with Bill on just taking up a little on the leewards while reaching in 10kts. I don't have a guage but would also be very interested in your final numbers on the tension.
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T-Flange -- Bruce (M31#95), - Thursday - 07/ 5/12 - 6:22pm
I have more photos of my mainmast support beam, as it has been updated, even since Randall wrote the article. Email me if you want additional information on my installation. Bill is right - it works like a dream, and makes tuning the rig easy.
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Loos numbers -- Terry Kelly, - Monday - 07/ 9/12 - 8:38am
I ended up with the Loos gauge reading 25 for the 7/32 wires.
After a week, they are still there, and yes, on a beam reach in almost exactly 10kts, there was slack in the leewards.
The head doors still do not stick but the door to the hanging locker does need attention at the forward-most point. There's a little hump there which needs flattening, and then we'll watch it.
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