I would put the port glazing material on the outside... that way the material's tensile strength is part of what is holding the water out and the seal between the glazing and the hull only increases as the water pressure against it goes up. Having the glazing material on the interior of the hull is rather stupid IMHO... since any pressure against the glazing will tend to open voids in the seals around the glazing. Many new boats have dead lights that are panes of plexiglass or polycarbonate that are thrubolted to the cabin top.
When you're dealing with liquids under pressure, you always want to design it such that any increase in pressure aids the sealing systems, rather than weakens it.
IIRC, you should drill the holes slightly oversize as polycarbonate and plexiglass both expand and contract at a different rate from the fiberglass, so the bolts will move slightly relative to the glazing material.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
If you're new to the Sailnet Forums... please read this To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Still—DON'T READ THAT POST AGAIN.