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 Lateral load at mast step?		  New Topic  Topic Locked
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jandrus
1st Mate

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USA
79 Posts
Initially Posted - 01/12/2003 :  16:37:34  Show Profile
Hi -

Anyone know how highly loaded the mast step is latterally? I had to pull mine to fix a deck leak. Fortunately everything looked solid - water was trickling out into cabin through old cable routing holes rather than being trapped in the core, apparently. When I put it back I took the time to upgrade to through-bolts from the factory lags. Got me wondering about the bolts, though.

Seems to me the step takes most of its load in compression. It also seems to me that since its under such compression - and increased compression under heavy sailing loads - that there ought to be significant resistance to sliding.

Anyone want to disabuse me? I'd hate to wrong and get punched in the nose with the butt of the mast some day.

Thanks.

Justin.

c25 #1942 s/v tako kichi
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dgabel
1st Mate

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USA
75 Posts
Response Posted - 01/12/2003 :  20:57:16  Show Profile
I haven't taken the time to study this, but it seems to me that if your mast is straight up and down, both fore and aft and side to side, then the only load will be vertical.

However, when the sails apply a load to the mast, the stays will stretch somewhat, or, if you run with them loose, they don't have to stretch, and the mast will take on some lean to one side. Then the force at the mast step will have a very small sideways component in the direction away from which the mast is leaning.

Similarly, if you tighten the backstay and induce some mast rake, the force at the step will have a small forward component.

But both of these lateral forces will be balanced by friction at the mast step, and by forces delivered by the bolts that hold the step in place. I really don't think (no study, remember) these lateral components will be of such a magnitude that they are likely to cause any shearing of the bolts, and that's the only way the mast is likely to move.

Dave Gabel
Walkure, Sail # 1484
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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.