[Public-List] MAST SUPPORT BEAM

[Wes Gardner via Public-List]

Hey Mike,

I wonder if you did mine?  It was certainly done professionally and with
some care.

Wes

On Fri, Nov 6, 2015 at 10:28 AM, Mike Lehman via Public-List <
public-list at lists.alberg30.org> wrote:

> Chip
>
> This has not been an issue on the liner boats.
>
> There are 2 things that caused the beams to fail on the older boats:
>    1. the glue gave up. The epoxies today are much better
>    2. Whitby drilled two holes directly in the center of the beam from the
> underside to countersink the bolts holding the deck step in place. The
> countersink holes are more than half way through the beam and are large
> diameter. This is where most of the stress is on the beam and these holes
> severely weakens the beam at the most critical location.
>
> The 2 aluminum plate reinforcement method was developed many years ago by
> Bruce Rankin, owner of #244 LinGin, and professor of naval engineering at
> the U.S. Naval Academy. It has proven to be a permanent repair and has
> withstood the stresses created on boats that that heavily raced in heavy
> weather.
>
> I have personally performed this repair on 10 or so boats and it usually
> takes about 10 hours from start to finish. There is information of the
> Alberg 30 website on how to do this at
> http://alberg30.org/maintenance/disorganized/deckbeam/repair/.
>
> For those who would like to cut your own plates, I do have a paper
> template that I can copy and mail. A word of caution, I have found that
> each boat is slightly unique. So I would use the paper template to create a
> 1/8" plywood template and fit it to your boat before cutting aluminum.
>
> The job is not difficult, and can be performed with the mast up (loosen
> the shrouds) and with the beam already deflected. I use a screw-type house
> jack (like you would find in a basement) and crank up the deformed beam
> back to original curvature. Then I go to the doctor and spend $50 for the
> visit, so I can get a prescription for anti-inflammatory medicine to
> relieve the pain of the deltoid bursitis that I just created in my
> shoulders.
>
> So have at it!
>
>
>
>
> ~~~_/)_/)~~ Mike Lehman ~~_/)~~~
>
>
> -----Original Message----- From: Chip Dance via Public-List
> Sent: Friday, November 06, 2015 9:06 AM
> To: fongemie at gmail.com ; Alberg 30 Public List -- open to all ; JAMES DAY
> Subject: Re: [Public-List] MAST SUPPORT BEAM
>
> Has anyone ever found it necessary to replace/rebuild/reinforce the mast
> beam on a liner boat? Or was Whitby successful in that upgrade?
>
> Chip
> #456
>
> Sent using a stone tablet and chisel.
>
>
> -------- Original message --------
> From: Jeffrey via Public-List <public-list at lists.alberg30.org>
> Date: 11/06/2015  4:54 AM  (GMT-07:00)
> To: JAMES DAY <junkflyboy at yahoo.com>, Alberg 30 Public List -- open to
> all <public-list at lists.alberg30.org>
> Subject: Re: [Public-List] MAST SUPPORT BEAM
>
> James,
>
> I replaced mine in 2013, and I just used the existing beam to build a
> laminating mold for the new beam. The existing beam came out of the boat
> easily and in one piece. It wasn't that difficult in the end, should have
> done this sooner.
>
> My new beam is made from white oak, and is built a bit taller and thicker
> than the original.
>
> I've got some images up here.
>
> http://sailboatseagrass.com/mast-beam-project/
>
> Jeff
>
>
> Seagrass. #116
> Boothbay Harbor, Maine
> http://sailboatseagrass.com/
>
> <http://instagram.com/jfongemie>
>
>
> On Thu, Nov 5, 2015 at 5:40 PM, JAMES DAY via Public-List <
> public-list at lists.alberg30.org> wrote:
>
> I am sure that this has been discussed, but I cant find a search window.
>>
>> Please advise if any drawings are available to make a new beam to replace
>> the wood one that supports the mast on top of cabin. Would like to replace
>> this before leaving this winter. I have access to a shop to make one from
>> metal, but would like to have a set of drawings, at least the over all
>> measurements, and curve. thanks for any help, feel free to send pm to
>> junkflyboy at yahoo dot com
>>
>>
>> thank you in advance
>>
>>
>> James Richard day (retired having a ball)
>>
>>
>>
>>
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>
>
> --
> ______________
>
> Jeffrey Fongemie
>
> <http://instagram.com/jfongemie>
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