Don't know what a dagger board is, but, yes....I've unwarped oak table
tops. Place wet newspaper or damp towel on the concave side....stay
with it, because it doesn't take long. Took about 15 min. for my table
top, IRRC. If too wet, or left too long, it will expand beyond flat and
be warped on the opposite side. When it is close to flat, remove the
paper or towel and clamp some strips of wood across it and leave it to
dry before unclamping.
I'd make careful drawings before you start, in case you (or local
cabinet shop) need to recreate it for you. If this is just a little
day-sailer, probably not real complex- a laminated glue-up with a couple
boards and maybe a gasket up top, to keep it from falling through the
hole. ISTR teak was the traditional wood of choice. But I am no sailboat
geek, so I could be wrong- my experience is from around 40 years ago,
when my family had a lake lot, and toy sailboats were consider less
annoying and cheaper than ski boats. I got pretty good at dropping the
belayed-off mast from an upside-down boat, righting the boat, getting
the mast on board, and dog-paddling the whole thing in disgust to the
nearest dock. (When kids are doing the sailing, you tie off everything.)
Make a new one out of marine ply. It won't fix. As the moisture content
change, wood warps depending on how it was cut.
You can use a piece of wood cut radially too. (ie from centre to perimeter
of the log.)
It's usual to use teak or similar rot proof wood.
This is for a small sailboat. The dagger board is roughly 36" X 11" X
3/4" and is made from
mahogany wood. When putting a straight edge accross the width at the
top (part of board that is in the boat when fully inserted), it is
flat. Placing a flat edge accross the width at the bottom shows a
3/16" gap at the center. This bow prevent the daggerboard from geing
able to slide into the slot.
One thought I had was to plan the outer 1/3 of the width until the bow
is removed. This would require removing at least 1/8".
You could do that, no reason for the board to be the same thickness (or
width) at top and bottom. You could also rip a slot up the bow, fill with
thickened epoxy and clamp flat.
IMO, solid planks aren't good for things that are immersed. They warp.
Glass and resin covered ply works better.
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