Crack in mast support beam

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reiter@clara.co.uk - 09 Mar 2008 13:02 GMT

Some advice please.

I had just finished off getting my Vivacity 20 yacht ready for the
coming season when I made a rather alarming discovery (that's sailing
for you: a succession of alarming discoveries interspersed with the
occasional sail!). I noticed a large crack in the arched beam that
runs under the foredeck around the bend where it dips to run under the
port side deck.. The beam is presumably intended as a support for the
deck-stepped mast. On investigation, I noticed that this had been
previously filled (with silicone!) and painted over by a previous
owner. I bought the boat last year and sailed all last season without
any obvious problems, and for all I know the crack may have been there
for years before I bought the boat. On probing the crack, which runs
all the way around, I found there was solid material beneath (i.e. the
beam does not appear to have broken all the way through). I am
wondering whether all that has happened is that the GRP that sheathes
the beam has cracked and whether I need to worry about structural
integrity? Why has the crack reopened? Has this been caused by mast
compression (maybe overtightened shrouds)? I intend to fill the crack
with a good epoxy product: will this be sufficient, or do I need to
investigate more radical solutions?

These old Russell Marine boats were built pretty chunkily, so I'm
hoping that I don't need to embark on major repairs or adaptions.

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Bruce in Bangkok - 09 Mar 2008 15:46 GMT

>Some advice please.
>
[quoted text clipped - 20 lines]
>These old Russell Marine boats were built pretty chunkily, so I'm
>hoping that I don't need to embark on major repairs or adaptions.

One caveat. If the crack actually had a silicone based filler injected
you will have to ensure that every trace of silicone is removed before
you use epoxy or it won't adhere well.

Bruce-in-Bangkok
(correct email address for reply)

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bellsouthnews - 26 Apr 2008 18:45 GMT

I may be telling you something you already know, but a 'trick' I have used
to fill cracks is to get a syringe with a large needle and inject the epoxy
deep.

Here in the states, these syringes and needles can be bought at a farm
supply store. They're used for cattle.

Could be that you just found a natural fault in the wood. I would get the
silicone cleaned out, fill the crack as deep as possible and keep an eye on
it. :) If no other stress cracks open up, you're probably OK.

> Some advice please.
>
[quoted text clipped - 20 lines]
> These old Russell Marine boats were built pretty chunkily, so I'm
> hoping that I don't need to embark on major repairs or adaptions.

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Boat Forum / Building / April 2008

Crack in mast support beam