Subject: [harryproa] Re:: windows (not software)
From: "taladorwood@yahoo.com.au [harryproa]"
Date: 10/31/2015, 12:29 PM
To: <harryproa@yahoogroups.com.au>
Reply-to:
harryproa@yahoogroups.com.au

 

Another big problem with windows (lexan, polycarbonate, not glass) is that they expand and contract a lot more than fiberglass.  They also flex differently than the hull.  They almost need to be sealed like a sandwich between rubber gaskets, like on cars and RV's to really be water tight.


Another thing to consider is that boats breathe as the wind goes by due to the Bernoulli effect and on the 'inhalation' phase will actually suck water in through any crack it can. And the main force a window has to be designed to withstand is being sucked out, not in.

Last but not least, the window opening weakens the structure and the corners have to be rounded to eliminate stress risers. The strength of the structure benefits a lot if the area surrounding the window is stiffened.

http://www.beavertailskiffs.com/wp-content/uploads/2012/10/IMG_6663-690x460.jpg

 

Notice the window above the hatch, it is essentially the same design as the hatch, with a hidden drain in the gutter.


That design style doesn't really need the rubber gasket to seal, it is mostly there for noise control. What is important is that the top of the window and hatch is flush and that the gutter drains.


I think that molded in design style is superior to the commercial add on designs.  Best of all it is much cheaper, easy to do and stronger.


Talador



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Posted by: taladorwood@yahoo.com.au
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