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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 v

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.

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1. A semi rigid airfoil assembly, functioning automatically with respect to an airflow, as a draft adjusting wing sail or as a spinnaker sail, for use with a freestanding mast having a halyard on a wind powered craft, the improvement wherein, said semi rigid airfoil is a stowable rigid wing, and has

1. A semi rigid airfoil assembly, functioning automatically with respect to an airflow, as a draft adjusting wing sail or as a spinnaker sail, for use with a freestanding mast having a halyard on a wind powered craft, the improvement wherein, said semi rigid airfoil is a stowable rigid wing, and has a plurality of higher lift to drag ratio characteristics, of the type comprising:(a) a port and a starboard semi rigid sail which are vertically disposed consisting of a plurality of rigid foam core panels that are sandwiched horizontally with an adhesive between an inboard and an outboard flexible sailcloth material, thereby having a separating space between each rigid panel, whereby the separating spaces are a flexible sailcloth material lamination and are a means wherein the rigid panels bend in an alternating accordion form of a plurality of inward and outward folds, thereby folding the semi rigid sails downward and over an outside of and connected to a "wing chord section shaped" boom that is in a parallel disposition to the rigid panels and separating spaces; (b) the port and starboard sails to each have a plurality of midchord spanwise and leading edge airflow slots for higher lift, and the slots airflow to exit between a trailing spanwise port and starboard sails edges, along with the trailing edges to also each have a plurality of concave depressions for low stall, the high lift slots altogether combined with the low stall concavities for a decreased vertical drag vortice abaft the wing sail; (c) means provided for mounting the airfoil assembly from a head of the sail to a foot of the sail so as to partially or entirely surround the mast; (d) means provided for a shape control of the sails to be a wing chord section profile; (e) means provided for a plurality of downhauls with a reefing operation of the sail panels; (f) a "full draft wing chord section profile" flexible boom slidably attached to the mast by means of a telescoping foreboom pivotably connected to the mast, and for a port and a starboard draft control arm to adjustably pivot a full draft of the flexible boom inboard to a "minimum draft wing chord section profile", the leading edge of the boom to be a pivotable connection of a port and a starboard side of the boom, the booms' pivotable connection being attached to a forward end of the telescoping foreboom, thereby an alternate movement of a port and starboard sides of the boom away from the mast; (g) means provided for a plurality of spare folded sail panels to be stowed.