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parclan

Small crack in aluminum mast

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Rigging inspection today turned up this; he drilled a small hole to stop the spread. What's a good course of action from here? Boat is a two spreader mast. 

2017111495152404951510694653885.jpg

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  Odd place for a crack. Please explain exactly where this is on the spar,what is the shroud, what was the intent of the slot?

Is that the taper weld?

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All I can think to do there is a doubler - probably epoxied and riveted.

I think I'd ask a spar maker for advice though

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Similar crack in an Express 37 rig at the Vang exit was fixed with a sleeve...  tapped and screwed with 2 rows of screws, every 4” or so

from mast base past the crack 

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A small crack like that can be welded if it is not in a highly stressed area.  Welding does reduces the strength of the aluminum a bit.  Otherwise a sleeve is the answer.  I am not a rigger, so take this advice with a grain of salt, but I have had a similar (somewhat smaller) horizontal crack in my mast welded with no further issues.  The crack was caused by over-fraculating, needless to say fraculating is no longer permitted on the boat.

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34 minutes ago, dash34 said:

A small crack like that can be welded if it is not in a highly stressed area.  Welding does reduces the strength of the aluminum a bit.  Otherwise a sleeve is the answer.  I am not a rigger, so take this advice with a grain of salt, but I have had a similar (somewhat smaller) horizontal crack in my mast welded with no further issues.  The crack was caused by over-fraculating, needless to say fraculating is no longer permitted on the boat.

Well what's the fuckin' point then?

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1 hour ago, IStream said:

Well what's the fuckin' point then?

Way easier to weld that crack if it is where I think it is - way up the rig.  Getting a sleeve in there is going to be non-trivial.

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How do you say “more turbation” in Spanish?

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Bueller? Anyone? Anyone?

[crickets...]

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Back to the original Q. slot looks like the upper shroud slot in Isomat masts. If so the crack is likely from the shroud pressing against the top of the slot as it entered the mast. 

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