| 摘要 |
A stowable semi rigid airfoil assembly, functions automatically to airflow as a draft adjusting wing sail, or spinnaker sail (19), for use on a mast (17) with a halyard (41) on a wind powered craft. The halyard connected to the heads (83) of port and starboard sail panels (10) surrounding the mast vertically, elongates the airfoil from a wing chord section shaped boom (21) attached to the airfoils' foot (57). The sailcloth (12) panels are laminated with rigid foam cored (11) horizontal panel sections (13) set between flexible sailcloth spaces (14), for folding the rigid panels down over the wing shaped boom. The top of the panel sections above the boom are outward folding (22) spaces, and every other one of the spaces up the sail are outward folding, and every other one of the other spaces are inward folding (16) and are increased in separation (20) between the rigid panels. The leading edges (27) of the sail panels are joined at the inward folding spaces. The sail panels have shape control lines (34) along the inward folds for a wing chord section profile. Downhaul lines (31) reef and stow the sail panels. The leading edge of the boom pivots the trailing two sides of the boom from the mast. The flexible booms' pivotable leading edge is connected to a telescoping (48) fore boom (45) that is distally connected to the mast. Pivotable connections of the spinnaker (49) and draft control arms (50) between the foreboom and the inboard sides of the boom (55) adjust the draft of the wing sail. |
