thank you
drawing Hi do you have any drawings in digital of this tri? I'm looking for some materials which can be use in our school boat project . amas...
sail is working as the main in A shape mast I think in project Amazon(?) with A shape mast. They had this system with the rope for the main...
Hi vertical rope between points A and B ( as a rope mast) with triangle sail : P= AB = 50 ft E= 15 ft how may I calculate force of the sail...
Hi Richard some time ago it was talk about plywood. Why marine ply is a better for boats. All of wood spec. used for marine ply are low or...