| 摘要 |
A sail comprises an inner membrane 1 and two outer membranes 2, 3, each attached substantially around the periphery of a respective side of the sail to form a respective pocket 4, 5. The width of the inner membrane 1 is less than that of the outer sail membranes so that, during use, the sail adopts an aerofoil cross section, resulting in improved aerodynamic performance. Air vents 6, 9 are provided in the outer membranes 3, 2, the vents being connected to the opposing pocket by means of collapsible tubes 7, 10 and respective holes 8, 11 in the inner membrane. The pockets may be divided into a number of separate compartment (18, Fig 4a) by a plurality of fabric ribs (17) that connect the inner membrane to the outer membranes. <IMAGE> |
