Dredging this thread back up to the top of the list...
I am fooling around with the idea of making a mold
and building a few fiberglass
hatches. Had a "Duh" moment a few days ago... Solid modeling programs at my finger tips and a CNC mill up at work. Afternoon or two and I'd have a mold
accurate to the thousandth.
Saw some pictures of a Contessa 26 with round hatches that struck my fancy. Seems like a hatch
without any corners would be easy to seal. Never seen a submarine with a square one! Any thoughts on climbing through round hatches vs square? I'm tempted to think a sail bag would slide through a round easier than getting caught in the corners, but haven't tried it.
Round would let me lay in layers of roving or uni and build something massive without having to fight the radius of the corners, no built in stress.
Anyone have opinions on fiberglass
as a hatch/frame material? Does it expand and contract
enough to be a pain in the rump to seal? At the moment I'm thinking to not have any hinges, just a chain and dogs
to lock it down. If I do hinge it, set them up so the pivot is above the height of the seal so it locks down.
Figuring a massive wind
scoop made out of sheet plastic with a few button snaps could wedge in place, with a shoulder to keep it from exiting the deck
at speed. Round hole = point it wherever the wind
is coming from.
(Whole idea being I need three water
tight hatches, and it'd be more than a thousand bucks if I go with stuff that is commercially available!)