Abstract: A sail system for a sailboat having a stayed, non-rotatable mast includes first and second booms, a single sail suspended from said masthead, the sail having a shape such that, with the vertical midline of the sail positioned along the mast, a generally triangular sail portion is formed on the port side of the sailboat and a second, symmetrical, sail portion is formed on the starboard side, both said starboard and port sail portions having substantial roach areas; and backstay means connected between said masthead and the stern portion of the sailboat to bend the masthead aft.

Abstract: A sailing vessel is provided with an improved rig which utilizes a fabricated adapter having a downwardly depending leg rotatably held in the hull of the boat and having a first forwardly angled arm for carrying a rigid mast spar and a rearwardly angled arm carrying a rigid boom spar. The sail has a curved leading edge attachable to the mast spar and a foot attachable to the boom spar which causes the mast and boom spars to be bowed toward each other and under continuous but adjustable tension resulting in a taut sail. Since the mast spar is forward of the center of rotation of the rig. The center of effort of the sail is positioned closely adjacent, but slightly downwind of the center of rotation of the rig resulting in easier handling of the sail, greater rig efficiency and improved balance of the vessel.

Abstract: An outhaul boom end part for a sailboard boom assembly is molded integrally from plastic. The outhaul boom end part is generally U-shaped and includes a pair of tubular portions for attachment to the booms and a central portion. The central portion is provided with a pair of jam cleat slots which extend generally parallel to a plane which bisects the U-shaped part, and a sleeve is mounted on the central portion with its excess perpendicular to the plane of the U-shaped part.

Abstract: The sail rig comprises a quadrangular sail. A mast sleeve is arranged through the sail area from head to the foot and a flexible mast of flat cross section is inserted therein. A wishbone or a single-boom is connected at the fore to the luff clew and at the rear to the aft leech clew. Owing to the curvature or camber of the sail, its periphery is subject to higher tension than the remaining surface. Therefore, even after rigging up, the sail will not only curve horizontally, but also vertically. When exposed to wind, the sail will form a harmonic compound shape having its concave side to windward. The mast connected to the sail by the mast sleeve bends in the same direction as the sail. The tension around the periphery produces a triangulation effect in conjunction with the mast, similar to that of stays, thereby preventing the mast head from deflecting to leeward. The tension forces of the sail acting upon the mast are balanced and negligible. It is thus possible to build a lighter and more flexible mast.

Abstract: An adjustment fixture for wishbone booms of board-sailing devices comprises two main tubes (1) joined at an acute angle on the mast side, and end tubes (3) telescopically adjustable therein, joined on the side of the stern leech rope. Each end tube (3) has several spaced-apart peripheral grooves (5). A locking ring (7) of rubber or the like is provided, which can engage respectively one of the peripheral grooves (5) and constitutes a tight seal between the main tube (1) and the end tube (3); this locking ring can be locked, with a locking part (6) shaped like an O-ring, into one of the peripheral grooves (5). A conical end section (9) of the locking ring (7) forms a readily handleable transition between the main tube (1) and the end tube (3).

Abstract: This invention relates to a boom end piece, which has at least approximately the shape of a U or V and is adapted to be connected by a plug joint to two tubular spars of a boom of a sailboard rig. The two leg ends of the end piece consist of pegs and the end piece consists of two one-half sections, which are rigidly connected to each other and each of which comprises two half pegs.

Abstract: A wishbone mast with a wishbone boom is disclosed for use on any form of vehicle, principally on watercraft. The rigidity of the system is assured by a rigid spacer extending across the wishbone boom that is mounted within the wishbone mast. Various balanced sail configurations are usuable with the structure.

Abstract: A wind-propelled craft is disclosed which comprises a hull supporting a pair of unstayed masts arranged to pivot about an axis lying in approximately horizontal plane between a first position, in which one mast extends substantially vertically and the other extends generally at right-angles thereto away from the hull, and a second position, in which the relative configuration of the masts is reversed, each mast, in use, having a sail attached thereto or incorporating an aerofoil, whereby in use one sail or aerofoil can be trimmed to the wind to provide forward propulsion while the other sail or aerofoil simultaneously provides upward lift tending to counteract rolling or heeling force applied to the hull by wind impinging on the first sail or aerofoil. A steering control system is also described in which a steering link passes from a control point through the region of the pivot point of a mast to a rudder.

Abstract: The forked or wishbone boom or spreader gaff has two individual booms. Each boom has two sections which are telescopically fitted into each other. An arresting device is provided to lock the two respective boom sections in an adjustable position. Accordingly, the length of a given forked boom is adjustable to the cut of various sails of sailboards.

Abstract: Protective caps for the ends of sailboat spreaders comprise an arcuate outer surface over which a sail or line may pass without being snagged, an opening sized to snugly fit over the end of the spreader, a slot arrangement to permit the cap to fit over a shroud that runs through the end of the spreader and bores in the cap normal to the slot arrangement into which a cotter pin may be inserted to hold the cap onto the spreader end.

Abstract: A principal sail (1) rotates about an erect axis (2) and an auxiliary sail or vane (3) is mounted downstream of the principal sail (1). The vane (3) is mounted on a boom (4) that extends from the principal sail (1) so that the principal sail (1) is trimmed as the tail vane (3) moves to its position of minimum drag. A second auxiliary vane (5) is mounted forwards of the leading edge of the principal sail (1) and is capable of opposing the moment of the principal sail (1) about its own axis as the principal sail is moved towards a stalling position.

Abstract: A wind propelled surfboard which has a catamaran hull wherein each hull can be folded to a collapsed position. Also, the mast and boom are capable of being folded when into a collapsed position when not in use.

Abstract: The slack portion or sag of the trapezoidal member fixed by both its ends to at least one of the two twin boom tubes is variable by sleeves engaging the two slack portion end areas, embracing the twin boom tube and which are displaceable in the longitudinal direction. One end of the trapezoidal member is held in a wedge clip, so that for improving the trimming of the trapezoidal member, its engagement points are displaceable on the twin boom tube.

Abstract: An apparatus (1) for attaching each end of a rope (12) to the boom of a sail board so that the rope (12) can be used by a rider with a "Hawaiian Harness" the apparatus (1) having in each case a frame (2) with a pliable member (3) held to the frame (2) and adapted to extend around the boom arranged so that with the frame (2) lying alongside the boom tension on the rope (12) will cause the frame (2) to tighten a gripping hold of the pliable member (3) on the boom. The apparatus provides for good retention of the rope position during periods of non-use and facilitates adjustment of its position during use by a sail board rider.

Abstract: A device for use in a sailing vehicle for automatically adjusting the angular position of a boom supporting a sail in response to varying wind pressures is disclosed. A pulley and an adjustment block are mounted for slidable movement inside an elongated tubular housing which is attached to the boom by a pair of brackets. A compression spring is also disposed inside the tubular housing between the pulley and the adjustment block for urging the pulley away from the adjustment block. An end block is fixedly mounted on the end of the housing nearest the adjustment block. An attachment line having a stop at one end extends into the housing through the end block around the pulley and back out through the end block. Structure is provided for selectively fixing the position of the adjustment block in the housing so as to set a predetermined initial pressure on the spring. In using the device, the other end of the line is secured to the body of the sailing vehicle and the adjustment block set to the desired position.

Abstract: A device for rolling and storing a sail associated with a rolling boom, including a sheath of deformable material encircling the boom and provided with rigid edges defining a slit for passing the sail therethrough, wherein the sheath is carried by the boom for free pivotal movement and includes a transverse cross-sectional area at least equal to that of the boom and the sail completely rolled thereon.

Abstract: A sail support and control system designed for use as sail assist propulsion on a cargo vessel.The system provides complete powered control of the amount of exposed sail, the angle of the sail in relation to the vessel, and clew outhaul and downhaul tension so that no manual handling of rigging is required.

Abstract: In a sailboard rig, the boom is provided at its mast end with an extension using a torsion spring, which in an operative position extends in the plane of the boom and which is provided at its fore end with an eye for attaching a starting sheet.

Abstract: In a watercraft such as a sailboat, wherein a boom is pivotally mounted to a mast and extends aft over an open cockpit, a plurality of fittings are mounted to the port and the starboard sides of the boom in a spaced apart manner. Elongate spreader members are removably carried by such fittings and they extend laterally outward over the open cockpit, terminating above the port and starboard sides of the cockpit. Flexible membranes are supported on the spreaders and flexible screening depends from the outboard edges of the membranes in such a manner that the screening surrounds the cockpit and the lower edge of the screening is held in place against the hull structure of said watercraft.

Abstract: A wind-propelled craft is disclosed which comprises a hull supporting a pair of unstayed masts arranged to pivot about an axis lying in an approximately horizontal plane between a first position, in which one mast extends substantially vertically and the other extends generally at right-angles thereto away from the hull, and a second position, in which the relative configuration of the masts is reversed, each mast, in use, having a sail attached thereto or incorporating an aerofoil, whereby in use one sail or aerofoil can be trimmed to the wind to provide forward propulsion while the other sail or aerofoil simultaneously provides upward lift tending to counteract rolling or heeling force applied to the hull by wind impinging on the first sail or aerofoil. A steering control system is also described in which a steering link passes from a control point through the region of the pivot point of a mast to a rudder.

Abstract: A spinnaker boom hingedly attached to the mast of a sailing boat by a traveller. The traveller is movable along the boom so that the boom can be moved relative to the mast substantially transversely to the longitudinal direction of the boat.

Abstract: A sailing craft having a mast mounted therein is provided with a track on the mast for supporting the vertical edge of a sail. To support the upper portion of the sail, an L-shaped gaff is provided having two legs, one leg being substantially parallel to the mast and contained against the mast by track slides or bolt ropes, while the other leg extends at an angle to the mast and supports the upper edge of the sail. The gaff is supported in an elevated position by a halyard that extends through a block at the upper tip of the mast, and a traveler is provided to change the position of the halyard along the gaff on the leg portion that extends away from the mast.

Abstract: A quick release-hook to be secured to the chest harness of the rider of a board sailer. The hook helps in bracing the sail of the board sailer by engaging a loop of a rope attached to the boom-like rail of the board sailer. The hook (9) pivots from hooking to release position when the rider moves the rope through the hook so that thicker portions of the rope can press abutment members (21), forcing resilient tongue (17) out of engagement with the hook which then pivots, passing through slot (25) between members (21) to release the rope.

Abstract: An adjustable roller furling spar includes an elongated base member which is securable on a sailboat and an adjustable periphery assembly which is attached to the base member and coextends a distance therewith. The periphery assembly is adjustable to define an effective winding cross-section of the spar which is variable along the longitudinal extent thereof and which is operable for windingly receiving a sail on the spar. By properly adjusting the periphery assembly, it is operable to compensate for irregular stretch in older sails when the spar is used for reefing so that even a badly stretched sail can be maintained in a substantially flat disposition.

Abstract: A gooseneck for rigidly but detachably attaching the boom of a sail-powered vehicle to the mast. The gooseneck includes a mast collar which in the unassembled condition is freely slideable over the mast. A boom yoke receives the forward ends of the boom spars. The yoke is vertically rotatable about a fulcrum provided in the mast collar. Co-operating surfaces in the collar and boom yoke lock the yoke to the collar and circumferentially compress the collar onto the mast as the boom is lowered to a horizontal attitude, thus firmly locking the mast collar, and the boom yoke carried thereby, to the mast.

Abstract: A wind propelled sailing device, such as a wind surfer, having a hull and a mast pivotally attached thereto with a substantially lateral boom extending from the mast and a sail for receiving wind is controlled in an improved manner through an apparatus that aids a sailor in counterbalancing the force generated by the wind. The apparatus includes a substantially rigid control member preferably including a pair of spaced-apart rigid rods pivotally connected at one end to the boom in an angular direction and rigidly connected to each other at a second end with a handle member. A connecting mechanism connects the rigid rods to the boom in an angular direction while preventing movement of the control member along the boom's axis. The apparatus allows the sailor to increase his counterbalancing force by allowing the sailor to lean further into the wind while minimizing reduction in effective sail area.

Abstract: A low drag and high lift sail has a fabric skin suspended by an edge tension device able to control forward and trailing edge tension to tune and reverse the airfoil section. The fabric skin is double, with a windward and lee section of different curvatures giving the airfoil section thickness. The sail is supported by a mast and a curved boom located between the two fabric sections and thus is out of the impinging air stream. The ends of the boom are used for the sail support, usually with an additional external spar or spars on the windward side. The mast includes a foot which is either fixed or attached by a universal joint to a craft for motive power.

Abstract: This mast and boom carrier combination consists primarily of a bow member and a stern member, having a multiple number of openings, for receiving different sizes of masts and booms, and it is designed for wheeled carrier use in transporting a sailing vessel.

Abstract: Fixture for attaching a wishbone element to a mast of a sheet of sail on a sail-board comprising a unitary member having a pair of holes or sockets at one end thereof for reception and retention of free ends of a wishbone element to be assembled therewith, a notch with a cylindrical surface extending between and separating the pair of holes or sockets whereby a portion of a mast may be retained in seated relationship against the notch, and a hook extending from one side of the unitary member over which a loop of a semi-elastic strap securing a mast in slip-knot manner may be readily passed and be effectively retained thereby.

Abstract: An improved wind-propelled apparatus is disclosed which includes a body mounting a stub mast generally orthogonal thereto. The stub mast is mounted in a well formed on the body and secured by a sleeve, resilient annulus and plug combination. Mounted on the stub mast is a generally vertical sail mast which is rotatable about a vertical axis. The stub mast also mounts a boom of sufficient length as to be capable of passing under the sail and having an eye and strap arrangement for securing the boom on either side of the sail.

Abstract: A device for supporting and storing the mainsail of a sailboat on the boom thereof comprising one or more support members composed of a resilient material having resilient clamp apparatus at a median portion thereof adapted to be mounted in clamping engagement with the boom, and flexible arms extending therefrom adapted to support the mainsail as it is lowered and being sufficiently flexible to be folded around the sail and having apparatus at its ends adapted to be affixed to each other, thereby securing the sail to the boom in folded condition.

Abstract: Wind-propelled apparatus in which a mast is universally mounted on a craft and supports a boom and sail. Specifically a pair of curved booms are arcuately connected athwart the mast and secure the sail therebetween, the position of the mast and sail being controllable by the user but being substantially free from pivotal restraint in the absence of such control.