Reply To: Floor Boards
I am pleased to hear from someone who actually had floor boards in their boat. It would be really interesting to see a drawing or a photo of these boards if you have one available.
You may be able to help me with another point regarding the strength of the bottom of the boat. The class building plans suggest a 6mm bottom to the OK dinghy with 20mm stringers. The drawings shows two stringers per side of the boat. With the plywood bottom being 6mm and the stringers being 20mm these means that there is a 26mm thickness to the bottom of the boat at the points where the stringers are glued on top of the ply. In the rules copied and paste below GRP and GRE sandwich construction shall not exceed 25mm including stringers. I realise that this applies to plastic and not wood construction but why is there a difference of 1mm between wood and plastic construction?
8.1 The hull, decks and centreboard case shall be made of wood or glass fibre reinforced resin (GRP or GRE) or a combination of these materials. GRP and GRE sandwich construction, not exceeding 25mm thickness including stringers, is also permitted. Wood used shall be of durable nature.
My current OK GRB 1251 was built is 1969 and had a 6mm bottom with plywood 6mm battens glued to the bottom but not cut into the station two or three. My first OK GBR 951 also had a 6mm bottom with 12mm battens glued on top of the floor and cut into both station two and three. Neither of these boats had floor boards. In 1986 I put my foot through the bottom of GBR 951 and had to cut in a new bottom panel the lenght between station two and three. I also had to replace one of the floor battens. This batten was made by glueing two 6mm on top of each other to form 12mm while allowing the two pieces of 6mm ply bend to the shape of the bottom of the boat. Battens in both boats where about 80mm to 90mm wide.
Presently I am replacing the bottom of GBR 1251 and it is going well but I want to check that I am following the rules.