Centreboard case

[Stuberry]

New centreboard case going into the Strawb. This is a difficult question to explain so bear with me...

Does it make any difference if the case goes "inside" the hull skin or "outside". Something like this:

==============|   |==============          or     ===================    ==================
                         |   |                                                                            |    |
                         |   |                                                                            |    |
==============|   |==============                 ===================   ===================

So either the edge of the hull skin can butt up against the centreboard case, or the edge of the centreboard case can but up against the hull skin.

Bear in mind the case will be made from 8mm foam laminated with 200g glass.

I think the "outside" the hull skin method would be easier because I would only have to cut away enough of the hull and deck to fit the sleave in.

Can any of you engineery types think of any reason either way would be better than the other?

[Banshee Ambulance]

I'm assuming that the hull and deck will remain together throughout this operation so going for the inside option would involve fitting a case through a hole smaller than the case which is obviously impossible.

[Stuberry]

The "inside" method would involving cutting off enough deck to get the thing inside, and would mean i could then fillet and tape the inside. And then put the deck back on.

The "outside" method would mean I only needed to cut a whole the size and shape of the new sleave, but I wouldnt be able to fillet and tape the inside.

[Phil Alderson]

you could make sure there is enough of a gap inside the case that you can run some glass tape from the bottom of the boat around the bottom of the case and inside. Just stick the CB into the case while it is curing to make sure it will fit.

[Will_Lee]

Most are type 1, but I think Mango's second case was type 2, but with several layers of very thin glass going from the outer hull skin up the inside of the case for a short way.

[phil_kirk]

We are doing something nearer type one but sticking a HD foam pad on the inside of the hull skin and letting the case into that.

At the top the case comes through the deck skin but flush with the top of the deck.  A second Hd foam pad is then bonded over the top and the section of the board will be cut through it.

I would go for the additional fibres and bonding fillet connecting the sleave/case to the hull and /or deck where possible to give some load transfer and watertightness.