A Photo & Discussion Forum for Wharram Design Enthusiasts
Since it is mentioned on the building guide that the back edge of the skeg should not received cloth, how do you protect it? Is a simple epoxy coating enough to protect the plywood? Same with the front edge of the rudders?
I have always glassed the trailing edge of the skeg, and leading edge of the rudders. No issues
Ship worms can, and will, eventually get through epoxy and paint alone, but not e-glass.
Any "sharp" corners are much more prone to dinks damaging the glass . I would if possible always round any corners to a nice radius and glass with multiple layers of lightweight 3-4 inch glass tapes until you get the required thickness. Trying to bend heavy cloth over an external or internal bend / angle / fillet / corner, nearly always results in the cloth pulling away unless you are using some kind of vacuum bagging..
Do you know to use the cloth with the fibres running at 45 degrees to the edge if going round tight corners? If you are cutting strips from a roll of cloth it's easy to cut them at 45 degrees. You still need some radius but the cloth will co-operate a bit better. Dressmakers do this with cloth if they want it to take a difficult shape more easily.
I generally do not go around sharp corners, the skeg/rudder being the only ones I can remember there being on the Tikis we have built. We simply add a piece on the flat and take a razor knife and trim when curing, then hand sand to ensure we don't go through at the 90s.