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

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


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.


1965 Alberg 30 #116

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
Internet Consulting, Website Design & Development

P.O. Box 485
Freedom, NH 03836
Tel. 603.539.1751
eFax 801.912.1692


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