[Public-List] Mast beam - Welded channel section

[Wes Gardner via Public-List]

Hi Dan,

Seems reasonable to me...particularly your SS beam - if that breaks, you've
probably got WAY bigger issues on your hands than a little mast/cabin top
compression!

The caulking of the chainplates - I would think you'd see evidence of leaks
down below at the knees and at the bulkheads.  If yours all look sweet and
clean, then you are living right!  I think I'd still recommend the Schaefer
chainplate covers...

Wes

On Tue, Feb 9, 2016 at 12:30 PM, Daniel Sternglass via Public-List <
public-list at lists.alberg30.org> wrote:

> Hello,
>
> On the subject of the mast beam... A few years after we bought our
> (non-liner)  boat in 1986, we had to make a doubler for the mast beam. My
> boat partner, at the time, and I had the good fortune of working at Borg
> Warner automotive, advanced development labs. One of the machinist was kind
> enough made us a stainless doubler, like the two aluminum sister-plates,
> but with a curved piece of stainless welded across the bottom. The channel
> section gives it great rigidity. Admittedly, the labor for this would have
> been very expensive if not for the g-job from a machinist friend of ours.
>
> It is certainly more fabrication work than the plates, but I believe it is
> far stronger. We jacked the beam up before drilling the through bolts, and
> more than 25 years later the top of the brace has not shifted relative to
> the cabin-top.
>
> One question -- Back in the day, plain old elastomeric caulk was
> recommended for the shroud chain plates, and we've been doing that for 30
> years with no evident problems. I tighten the (5/16") chainplate bolts
> as-needed every year, and they are solid. I take that to indicate that
> there is no evidence of rot in the support structure. Does that seem
> reasonable?
>
> Thanks,
>
> --Dan Sternglass
> Watcher of the Skies, #201, 1966
> Cayuga Lake, Ithaca, NY
>
> dans at stmktg.com
> mobile: +1607-592-8012
>
> Strategic Marketing Associates
> 403 Highgate Road
> Ithaca, NY 14850
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