| 摘要 |
<p>The reef guide increases or lessens the sail area of a wind surfing board or the foresails of a yacht. There is a sail (1) with base folding marks (2,3) and a mast sleeve, open at its top and with a window at the bottom which stops the raising of the folded sectors. The ends of the folds are bent to form triangles, the ends of which are introduced into pockets at the top of the folds. The parts to go into the pockets are curved and have a sliding closure to stabilise the folded surface.</p> |
