[Public-List] Large ports in cabin

[John Birch]

Hey Mike,

Likely Dolfinite was used, as is found sealing the stern tube through the 
hull. It would dry out over time if exposed to UV and the sun, yet remains 
flexible out of the UV in the stern prop shaft tube application to this day.

Best

John


----- Original Message ----- 
From: "Mike Lehman" <sail_505 at hotmail.com>
To: "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org>
Sent: Wednesday, October 28, 2009 8:48 AM
Subject: Re: [Public-List] Large ports in cabin



I am not sure when Whitby changed from rubber to aluminum frames, but the 
early ones had rubber. Phil Beigle (US #17) changed his rubber for aluminum 
last year. We have made replacement plexiglass for many boats, we cut the 
plexiglass the same for each. The plexiglass is not a perfect fir, it never 
was in the original, but the silicon makes up the irregularities and forms a 
great seal. The trick is not to tighten the frames all of the way when you 
first install then new plexiglass. Tighten the bolts (almost); let it cure 
for a day; and complter the tightening the next day. This allows the silicon 
to form a good gasket and they will never leak (mine are gong on 32 years). 
The original caulking was some kind of gray stuff (maybe someone on the list 
know the name), but it harden, became brittle and they would leak. It was 
the wrong stuff, but maybe the only thing available at the time the boats 
were built.



see http://alberg30.org/maintenance/HullDeck/Portlights/ for more tip on 
doing this project


Mike Lehman


><((((º>`·.¸¸.·´¯`·.¸><((((º>`·.¸¸.·´¯`·.¸><((((º>









> From: hugh_alberg at hotmail.com
> To: public-list at lists.alberg30.org
> Date: Wed, 28 Oct 2009 09:17:21 -0200
> Subject: Re: [Public-List] Large ports in cabin
>
>
> Good morning Mike,
>
>
>
> I may be misunderstanding your comment but our boat (#39) has aluminum 
> frames around all of the ports (large and small). Purhaps the rubber 
> gaskets were only used in the very early boats. Our frames appear to be 
> original to the boat and a standard size. They are through bolted through 
> the cabin side fibreglass and finished on the inside with acorn nuts. 
> There is some kind of flexible sealant under the frames (I'll find out 
> what when I replace my ports next spriing) that was dried out when I 
> bought the boat but seems to have absorbed moisture and re-sealed itself 
> since.
>
>
>
> With regards to the actual plexiglass replacement I suspect that each 
> individual port will have to be cut to match its opening. I spent a year 
> working for Vandestadt & MacGruer when I was in university. While we used 
> templates to mark outlines for port openings in the fibreglass and, also, 
> for cutting the plexiglass ports, the actual cutting was neither exact nor 
> identical from one boat to the next. The rubber gaskets were able to 
> handle the differences but I would not have trusted even the best fit 
> ports to stand up to a serious impact. In the case of our Albergs, I would 
> imagine that Whitby followed the same construction process and used the 
> flexible sealant to fill the gaps. The bolted frames would provide much 
> more strength that the rubber gasket.
>
>
>
> Cheers,
>
>
>
> Hugh Mcormack
>
> Woody Point, NL
>
> >
> > The early boats all had rubber gaskets on the main ports and the smaller 
> > ones too. Probably the best solution would be to make aluminum frames 
> > for inside and outside and thru bolt the making a sandwich with the 
> > plexiglass. This is one place, the only place, where I think it is 
> > appropriate to use clear silicon. It would be best to have a frame to 
> > make a template, short of that, once the windows were removed, you could 
> > trace the inside of the hole and make a frame template from there. Maybe 
> > someone on list has a frame they could trace and send you the drawing.
> >
> >
> > Mike Lehman
>
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