[Public-List] Lower Mast Plate fastening for non liner hulls

Jeffrey alberg30nh at gmail.com
Tue Nov 4 04:57:41 PST 2008


Stephen,

Thanks for responding.  Based on what you saw under the plate, is the area
susceptible to core rot?  Is there core underneath? Or, solid fiberglass in
that area.

I have no reason to remove mine, accept to check for rot & rebed everything
in sealant.

Jeff

1965 Alberg 30 #116
http://picasaweb.google.com/fongemie


On Mon, Nov 3, 2008 at 3:48 PM, Stephen s <alberg114 at hotmail.com> wrote:

>
> Jeff,
>
> I have removed the mast step and this guidance is correct. Also I would use
> penetrating oil or some other type of lubricant since these screws are very
> difficult to remove, they become welded as part of the step.
>
> Actually I cut the heads off the centers and push them through the bungs
> not to damage the beam or bungs upon removal.
>
> Regards,
> Stephen
> #114
> > Date: Mon, 3 Nov 2008 20:35:57 +0000> From: crufone at comcast.net> To:
> public-list at alberg30.org> Subject: [Public-List] Lower Mast Plate
> fastening for non liner hulls> > > > > Jeff, > > > > I have hull #133.  I
> have not removed the lower mast step plate, but this is my understanding of
> how it is assembled.  Both the port and starboard bolts of the middle (fore
> and aft) pair pass thru into the wooden mast beam.  The nuts for these you
> will find under the bungs on the lower surface of the wooden mast beam. The
> fore and aft pairs of bolts are only threaded into the upper glass surface
> of the coach roof.  To me this is the chicken or the egg scenario.  I
> suspect that the thru bolting to the mast beam was just a production
> procedure used to help install and properly locate the mast beam.  Because
> of this thru bolting, the remaining two pairs of bolts are used mainly to
> position the base plate and help keep it from rotating, thus they only need
> to penetrate into the glass some 1/2". > > > > In theory the mast beam
> functions as an 'I' beam.  The strength of an 'I' beam is created by the web
> that holds the two horizontal surfaces of the 'I' in alignment.   Bolting
> the lower mast step plate directly thru the center-line (fore and aft) as
> well as close to center-line (port to starboard) of this wooden mast beam
> would, in my book, severely weaken this 'web' and the beams function as a
> weight bearing 'I' beam. > > > > In the future I plan to completely remove
> my mast beam and relaminate it, returning it to the boat in its original
> form.  I will consider somehow filling in the thru holes on the center pair
> of mast plate bolts to increase the strength of the  > > wooden beam.  It is
> my thinking that the thru botls provide the possibility of yet another leak
> into the interior and may NOT be necessary to hold the lower mast plate in
> location.  I may come up with a solution that has this pair of bolts go into
> the mast beam but not thru it.  With the additional two pairs of bolts into
> the glass of the coach roof and something like 4200 sealant or bedding
> compound I don't think the mast plate will rotate or slide around from its
> intended location. > > > > Hope this helps you some with your project. >
> > > Michael > _______________________________________________> These
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-- 
Jeffrey Fongemie
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