Abstract: A forked thill head attachment for installing a forked thill to a sail mast of a rigging comprises a forked thill head (1) which, in a top view, is constructed essentially V-shaped, and opposed clamping jaws for gripping about the mast having a rearward vertical gap (17). In order to produce a firm connection between a forked thill and a mast for a rigging, that can be firmly locked and released with little expenditure of force, the clamping jaws (13) are constructed as a separate component from the forked thill head (1) and held by a longitudinal bolt (21) guided through the forked thill head (1) in the longitudinal direction in the plane of longitudinal symmetry. Locking rotation of the screw member provided at the forward outer side of the forked thill head (1) over the longitudinal bolt (21), moves clamping jaws (13) in the longitudinal direction while contacting, in the forward direction, contacting surfaces (11) likewise running, in a top view, V-shaped to one another.

Abstract: A resiliently flexible wishbone boom comprised of a pair of boom sections attached to the pivotal mast of a sailboard. A sail located between the boom sections is attached by its leading edge to the mast and at one location along its trailing edge to the outer end of the boom. The boom has flexible forward portions which enable the boom sections to be drawn closer together, thereby making the boom longer and applying increased outhaul tension on the sail which changes its overall curvature and aerodynamic efficiency.

Abstract: The invention relates to a rig for a windsurfing board in which the clew (8) of the sail (2) prior to tensioning and trimming of the sail (2) is fixed in location in a stern fitting (10) of the wishbone boom (3). The stationary fixing can either be done preprogrammed with the aid of a scale, whereupon the wishbone boom (3) is fixed to the mast in that it is pushed downwardly from above and engaged, or a fixed point is established which holds the clew (8). In this embodiment the trimming of the said (2) is made in the bow fitting (11) in that the connection (15) between the mast (1) and wishbone boom (3) is constructed in such a manner that the mast (1) is displaceable longitudinally to and fro with respect to the wishbone boom (3) and lockable.

Abstract: A body sail device mountable around the body of a user for propelling the user through the water. The body sail includes an upstanding mast and a mounting member attachable on the body of the user for mounting the mast on the user. An outwardly extending boom is attached to the mast. At least one and preferably two sails are attached to the boom mast. A guide assembly is pivotally attached to one of the sail for controlling the trim of the sail with respect to the boom and mast.

Abstract: A device for securing a forked boom to a mast and includes clamping elements, which engage the mast and are provided on a retaining member which at least partly surrounds the mast. The retaining member is annular and is larger in diameter than the mast. At least one wedge-shaped clamping element is slidably mounted in the annular space between the retaining member and the mast.

Abstract: Sailboat has mast tiltable aftward as well as a thwartship when bottom of mast is shifted from central position on athwartship track. Above the track the mast connects with a pair of rigid supports which diverge toward hinged connections on opposite sides of the boat forward of the mast.

Abstract: A sail on a cylindrical mast provides an aerodynamically shaped leading edge automatically oriented into relative wind, and a smooth shape behind the mast automatically adjusting for changes in trim of the sail. Flexible rib pairs opposite the mast are clamped tantentially to full length battens, the battens defining the shape of the ribs and the orientation of the leading edge.

Abstract: 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).

Abstract: Arrangement for a boat (1) which has a boom projecting out from a mast (2) and designed to be connected to a sail, especially on a sailing boat (1). The invention enables the boom to be prevented effectively and reliably from swinging around the mast too rapidly on occasions when this is not desired, and thus reduces the risk of personally injury occasioned by the boom. The arrangement (5) is connected via one section (5A) to the boat (1) and is connected via a further section (5B) to the boom (3), the two said sections (5A and 5B respectively) being mutually connected in such a way that the arrangement (5) forcibly urges the boom (3) to swing towards a position substantially transverse to the boat (1).

Abstract: An arrangement for controlling a spinnaker of a sail catamaran having two hulls joined by beams, comprising a spinnaker boom to whose front end spinnaker and one end of a halyard are secured, the other end of the halyard being secured to a mast. Lower stays are each secured by one end to the front end of the spinnaker boom and by their other ends to respective stoppers. On the front beam joining the hulls there is provided an upright, and the spinnaker boom is hinged to the upper end of the upright. There are also provided two stays, each having one end secured to the upper end of the upright and the other end secured to the bow of a respective hull.

Abstract: A device for fixing the wish-bone of a sail-board to the mast of this sail-board in a fast and easy manner. The device comprises a U-shaped element intended to be connected to the mast, this element having two sleeve-shaped ends in which are inserted both arms of the wish-bone. A column-shaped, mast-engaging body is provided to connect the U-shaped element to the mast. This body has a bearing surface against which the mast may engage. A lever-operated, hook-clamping system is mounted on both sides of the bearing surface of the body to fix this body to the mast after the mast has been positioned against the bearing surface, such a fixation providing the requested connecting of the U-shaped element and wish-bone attached thereto to the mast. This device is particularly interesting in that it considerably simplifies the relatively delicate installation of the wish-bone onto the mast of a sail-board.

Abstract: Bearing systems for gooseneck units used to hold booms onto the masts of sailcraft comprise a pair of substantially identical bearing members, except that the central longitudinal bore of one member is smaller than such bore of the other member. Each of the members comprise a small portion that can fit into the longitudinal channel of the slide member of the gooseneck unit and a large, integral portion that will not fit into the channel, but is contoured to slide within a vertical track in the aft side of the mast of the sailcraft. The pair of bearing members is fastened into the channel of the slide member by a screw long enough to span the channel, which screw has a diameter smaller than the larger bore of the bearing members, but larger than the smaller bore of the bearing members permitting the screw to be threaded into the smaller bore.

Abstract: The present invention relates to a connecting device between the wishbone 7 and the mast 2 of a sailboard, characterized in that it comprises a substantially V-shaped element 8 pivoted on each of both arms of the wishbone 7 and intended to surround the mast 2 when hoisting home the clew 6 of the sail 4 on the said wishbone 7.

Abstract: The sailing device has a hull, a framed sail, a boom which is connected at its upper end to the sail by a universal connection located at the center of gravity of the sail, a vertical mast, an auxiliary boom pivotally connected at its lower end to the mast and at its upper end to a bar which is adjustably connected to the mast to vary the angle of the auxiliary boom, the auxiliary boom and the bar being rotatable as a unit about the axis of the mast and the boom being detachably connected to the auxiliary boom in parallel relation thereto. Preferrably, the sail framing is collapsible for handling and storage.

Abstract: Sailing vessel having mast and sail tiltable fore and aft and athwartship. The mast is held at an intermediate place along its length, and its lower end is swingable about the intermediate holding means.

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: A sailing rig for use on a sailboat comprising a sail formed in the shape of two approximately ellipsoidal portions with a free-standing mast being rotatable on its vertical axis, the mast being curved near its top from the vertical axis of rotation of the mast so that the sail, when the sailboat is close-hauled, folds around the mast and when the sailboat runs before the wind, the sail unfolds and opens to fly free of the mast.

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 radar loaded, hollow yacht mast is disclosed which is pivoted at the bottom to the deck by a tri-sectioned elastomeric torsion spring hinge assembly in which the torsion is produced by relative rotation between the inner section and the two outer sections. The torsional resistance of the hinge assembly prevents the mast from falling when the bolts and stays are removed and the restoring force in the spring elastomer when the mast is pivoted flat to the deck assists in raising the mast back into its upright position. A hollow, flanged mounting connecting the hollow mast to the movable section of the hinge assembly prevents sea water from entering the hollows. Provisions are provided for pre-loading the hinge spring with a torsional stress in either direction when the hinge is closed.

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: In accordance with one aspect of the disclosure, the sail portion of a sailboard has upper and lower sections, and the lower edge (foot) of the upper section is lapped relative to the upper edge (head) of the lower section. Apparatus is provided to cause the lower edge to be on the upwind side of the upper edge, regardless of the tack that the boat is on. Such apparatus comprises a rotating boom which rotates through the sail, in such manner as to shift from one side of the sail to the other and also cause the above-described lapped relationship to occur in either tack. The diclosure further relates to a combination of the sail system with the board, to the method of achieving the indicated lapped relationship and of rotating the boom, and to other important features.

Abstract: A mast is mounted onto a boat for 360.degree. rotation about its longitudinal axis, relative to the sailboat and the rigging for the mast. The rigging braces the mast against buckling and comprises a masthead, a transverse spreader bar and shrouds. A forwardly directed longitudinal channel in the mast receives bolt ropes at the forward edges of two soft fabric panels which together make up the mainsail. Each mainsail panel extends from its bolt rope within the channel out through a narrow slot in the mast. When sailing generally into the wind, each mainsail panel curves partially around its side of the mast and then extends rearwardly from a line of tangency with its side of the mast, generally contiguous the mainsail panel. Each side panel of the mainsail is secured along its lower edge to a separate boom, so that the two booms can be swung apart to move the two sail panels into a "wing-out" position, for use when sailing with the wind.

Abstract: A goose-neck fitting used to form a universal joint between a boat mast and a hollow thin-walled boom or spinnaker pole comprises a tubular socket received into the end of the pole adjacent the mast. The sleeve is suspended in the pole parallel to the pole axis by footings which, with the sleeve, form an H-like truss that extends between the opposite walls of the pole for an appreciable distance inward from the pole end. When in use the sleeve receives a male connector member swivelly mounted on the mast, the goose-neck connection opposes shear forces acting on the pole so as to maintain the pole in the proper orientation with respect to the mast and enable the pole end to withstand the substantial shear forces acting upon it at the point of its connection to the mast.

Abstract: A sailing rig having camber adjustments is disclosed. The rig includes a mast that is sharply cambered adjacent its base and pivoted to a vehicle, and a boom pivoted to the center pivot of the mast. The sail may be connected to the mast by a continuous bead on the edge of the sail which is received in a slot in the mast and slides between two halyards that are connected to the sail and pass through the tubular mast, one on each side of the slot.