With you on that... -- MOA

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Date Posted: - Friday - 07/24/09 - 1:38am
Author: Randall, Murre, M31
Subject: With you on that...
In reply to: Jared Kibele 's message, "I have a theory about the mast bend" on - Thursday - 07/23/09 - 1:04pm

Jared,

The situation of the main on Murre looks similar to yours, and though I've worked much of the "bend" out, the spreaders still have a significant aft sweep like those on your boat.

I too have decided that this is due to a small forward rake of the mast ***below*** the spreaders, but I'm less certain about the need to adjust the angle of the step. It is logical that the acquiescing of the coach roof could cause the mast to fall forward as the step droops, but that much? I measured the angle of rake in the drawing you reference and it's about 3 degrees. But that's a tiny adjustment at the step.

Just thinking out loud.

I've passively attempted to pull the middle and lower part of the mast aft by adjusting the lowers, but that didn't really work. I think to realign with a straight aft rake will require taking all stays loose and starting the tuning process from the beginning, which I have not yet done.

Good argument though. I think you�ve got the problem right.

RR

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Replies:

[> [> [> [> I'm glad someone agrees -- Jared Kibele, - Friday - 07/24/09 - 1:30pm

I've talked to a number of people about this including a couple of boatwrights and riggers. Most of the time I've just gotten blank stares in response. ...I think this may be the first time I've been able to explain myself properly. Still, it's good to have someone who knows these boats so well agree with me.

I recently got a chance to see the inside of a slightly later Mariner 31 (hull #30-something just moved into my marina, John who's last name I can't remember - I have his card somewhere). I noticed that his mast step arch has two beams across where my boat (hull #9) only has one: (http://www.flickr.com/photos/kibele/3520930768/in/set-72157617972117480/). So I think my boat is particularly susceptible to having the roof cave in under the main mast and, with only one narrow beam, fore or aft tilting seems especially likely.

To complicate matters more, the whole deck and house including the coach roof were rebuilt by a previous owner so it's entirely possible that he angled the mast step incorrectly.

With my temporary compression post thingy, I've already raised the roof by about a half inch and I'm building steel braces for both sides of the mast support arch. I'm going to take the mast down soon and when I do, I think I'm going to brace the roof behind the mast support arch. Once that's done, I want get a bronze wedge made to put under the mast step to get the rake back into the bottom of the mast.

Should be a piece of cake, right?

-Jared

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