Sailcloth is provided wherein the woof is arranged at a predetermined angle, less than 90.degree., to the warp. Sail woven in this manner is protected against stretch along its leach and foot.
The luff area of a sail is stabilized by arranging the directional stability of the sail material to help support the load on the luff area of the sail between the head and the tack. Different sail constructions utilize triangular or trapezoidal panels along the luff area of the sail so that the line of maximum directional stability of the material in each panel is arranged to counteract the lines of stress appearing in the sail between the vicinity of the head and the vicinity of the tack when under load and properly tensioned. A similar technique can be used to stabilize the foot area of the sail.
An improved single-boom sailing rig for sailboards, and methods of use, are disclosed. A curved, rotatable boom (100) is provided with a forward end set at a slight angle with respect to the chord, with a separately-rotatable camber control (110) located in the forward end within reach of the sailor's forward hand, for controlling sail curvature with sails (18 and 19) filled and drawing. A finger-operated mast clamp (120) connects boom (100) to mast (13) and provides pivot pin (126) as a bearing onto which the boom (100) may be pushed during assembly. A boom extension (130) is provided with an eccentric locking mechanism for matching boom length to various sail sizes. An alternative extension (230) is locked by insertion of a pin (233) through any of a series of holes (234). Boom extensions (130 and 230) are provided with a sand-proof aft boom bearing assembly (140) having an aft pivot pin (141) which is pushed into plug (145) during assembly, to connect the clews of sail components (18 and 19). A resilient line (149) and a wingscrew (153) provide length and differential sail stretch matching adjustments for sail components (18 and 19), to prevent air leaks between flap (21) of upper sail component (18) and head (22) of lower sail component (19). Sand is excluded from entering camber control (110) and extension (130) by compression of heat-shrink tubes (119 and 139) against wiping rings (118 and 132). In a variation using low-stretch composite sail materials, or radially-cut sails, the wingscrew (153) is eliminated and clew plates (150 and 155) may be replaced by grommets. The sailor matches the length of boom (100) to that of the sails of his choice by moving extension (130 or 230) in or out of boom end (103) and locking it in place. With the sail full and drawing, the sailor may change sail curvature by rotating camber control (110) with his forward hand.
Fiber oriented sails made of woven panels of scrim type weave wherein warp yarns in the panels follow primary load paths in a sail and a method for making woven panels and sails.
Fiber oriented sails made of woven panels of scrim type weave wherein warp yarns in the panels follow primary load paths in a sail and a method for making woven panels.
A seamed sail made from a full size precursor sail of yarn oriented load path specific type which is thereafter cut and seamed; a method for making the sail and an apparatus for it.
