Re: Transom Thickness
this is kinda tricky......
the tolerance is 1/16th.
it is called flatness and parallelism.
what that means ....is around the key hole......it must be the same thickness from any point......that is parallelism.
the flatness means there cannot be any deviation from the parallelism from the inner face or the outer face.
but don't get too worried !......it is crucial, yes.....but at the same time...its no big deal......here is why !
when you remove your transom, take all the wood out, and grind the residual right to the glass hull.
(you will have grinding divots and high spots in the inner skin)
now....build your transom....
i like using a one inch ply and a 3/4 ply......the one inch is really nice to work with and is very stiff.laminate the two together with one layer of csm on each inner side.
after the transom is laminated and cut to shape....and you are ready to install.
use a thickened resin, and screed the stuff onto the skin of the hull.....use a trowel with a smooth edge. this will fill any gaps or un even surfaces left by the grinder.
then glass a single layer of csm on to the skin over the wet filler.
lay a single layer of csm on the inside of your new transom....and install the transom while all the resin is still wet.
you are now, very flat, parallel and darn close to 2 inches thick.
after the transom is in.....use your thickened resin, around the edges to fill any gaps.
tab the transom in with one layer oc csm around the edges over lapping the filler by 3 inches and 3 inches on to the hull.
on the bottom of the transom where the key hole is.....do not let this overlap touch where the key hole will be.
glass the entire surface of the new transom with 2 layers of csm.
each layer should be larger than the last, you also want to cover the tabbing on to the hull.
finally......a full 1708 covers the two csm. you can also use strips of 1708 to further tab a transom to the hull.
this process will give you 2 just over inches of glass and wood and will put you in tolerance range for the transom.
as long as your tabbing does not go into the area where the key hole is... your flatness will be maintained, as well, so will the parallelism!
in the link in my sig. there is a full transom install in an i/o situation. with instructions.
cheers
oops
