| 摘要 |
A composite iso−stress sail structure (12) comprises a sail body having an expected iso−stress line (32), when in a chosen sail shape and under a loading within a chosen range of loadings. An iso−stress element (34) is laminated to the sail body material to create an iso−stress portion at a corner of the sail body. An edge of iso−stress portion is shaped to be at least generally parallel to the iso−stress line (32). The iso−stress (34) portion extends from the corner along at least one of the sides of the sail distances greater than 20% of the lengths of the sides, respectively.
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