摘要 |
PURPOSE:To prevent the boat from excessively listing during strong wind as well as to ease disassembly and assembly of the sail boat in such a way that rear list only is prevented by a jib sail. CONSTITUTION:Though a mast 3 is held at its lower end part by a cylindrical concave part 20, and rear list is prevented by a jib sail 5, since a stay is not provided, in case where a sail undergoes the wind, it is to be listed in transverse direction by flection. If the mast 3 is listed in forward and rearward directions, it is unfavorable because the performance of the boat is changed, but list in the transverse direction is favorable because it prevents the boat from excessively listing by means that when it undergoes the strong wind, some of it lets pass by. Besides, the mast 3 can be exceedingly easily disassembled and assembled because what is to be done is to only insert it into the cylindrical concave part 20, but there is no need of fixing the stay. |