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Boom repairs- can it work


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#1 Mean Streak

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Posted 18 February 2018 - 02:51 PM

My current boom is made out of an old mast tip.

My boat is a R930

It’s 4.4 metres long and around 75cm back from the clew end are two opposing irregular holes around the size of a 2 dollar coin around 1/4 of the way from the bottom, will try and get some photo’s., but could have been attachment points when it was a mast.

They worry me as while the boom is pretty heavy duty it’s an obvious weak point.

Just got a quote on having a boom built and it’s a bit of a stretch at the moment so was wondering if these holes could be welded or repaired with a plate or sleeve?

Any advice? Will try and get some pics shortly.

Edited by Mean Streak, 18 February 2018 - 02:52 PM.

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#2 Puff

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Posted 18 February 2018 - 02:58 PM

A sleave would fix it but it probably isn’t a problem as-is. Booms were often drilled along their whole length. The most loaded point is from the mainsheet to clew and around the vang attachment.
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#3 Mean Streak

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Posted 18 February 2018 - 03:54 PM

Attached File  image.jpg   287.12KB   2 downloadsAttached File  image.jpg   287.12KB   2 downloads

So these are on each side, actually around 1.2 metres back from boom. They are around 2.5cm each. No cracking or anything and the wall is plenty thick etc.


Should I not be too worried?
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#4 Vorpal Blade

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Posted 18 February 2018 - 04:17 PM

Put a sticker over them and ignore them, particularly if they are forward of the mainsheet attachment. If they were between the mainsheet and outhaul use a stronger sticker. You may want to clean the edges of the holes so they are a neat radius so cracks won't propagate from weak edges.

Similarly the boom on VB is an old piece of mast (off the Young 12m Kiwi as it happens) and we load it up A LOT, particularly with the square top upwind in 25 knots of breeze, and it has a random collection of old tang holes and slots all over the place. It  gets regular inspections and hasn't shown any signs of fatigue around these. 


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#5 wheels

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Posted 18 February 2018 - 05:22 PM

Just so as you know, they can be either welded or patched as well. Welded and ground would make a repair that you would hardly know was there. A patch may or maynot be a pain, as you would have rivets poking into the boom internals


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#6 erice

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Posted 18 February 2018 - 05:28 PM

gallery_1988_37_2783566.jpg


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#7 RushMan

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Posted 18 February 2018 - 05:46 PM

How long have the holes been there already?
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#8 native

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Posted 18 February 2018 - 06:16 PM

Dont worry about it, stickers are good idea. If you decide to paint it one day you could even bog them up if they still bother you. 


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#9 Mean Streak

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Posted 18 February 2018 - 07:08 PM

I’ll ignore them then.

Holes have been there since i’ve had the boat,

It’s just that the mainsail just got quite a bit bigger. Sound’s all good though!
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#10 ScottiE

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Posted 18 February 2018 - 10:01 PM

A bit too much metal in that hole Eric!
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