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A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 7574972 | Three-dimensional sail apparatus A three-dimensional sail apparatus that is made up of a plurality of spacedly disposed foils and a sail cloth for attachment to the foils on opposite sides thereof. Each foil has opposed sail cloth supporting sides that together define a foil shape, A support is dis... | 08/18/2009 |
| 7114456 | Reversible camber airfoil A reversible camber airfoil rib has a first side and a second side that are adjoined at an angle along an interrupted common inner edge extending longitudinally from a leading edge to a trailing edge. An aperture extends through the common inner edge and enables the... | 10/03/2006 |
| 6971430 | Cast composite sail and method An apparatus for casting sails comprising a roll stand configured to supply a carrier film. The apparatus contains a support mechanism for the carrier film, and further comprises of a drawing mechanism, a first resin dispenser, a first wiper portion, two yarn applic... | 12/06/2005 |
| 6892659 | Multi-section boat sail The invention relates to a boat sail comprising a first (4) and a second (6) sheet, having similar shape and dimensions, coupled each other in correspondence of the outer perimeter and by a plurality of transverse ribs (12), provided between sai... | 05/17/2005 |
| 6886483 | Sail and method of manufacture thereof A sailboat sail includes a sheet of material that contains stretchable webs that assume a planar orientation when placed against a planar surface, but which can stretch into a sail or airfoil orientation when mounted to a sailboat and exposed to wind loading. The sh... | 05/03/2005 |
| 6622648 | Sail and method of manufacture thereof A sailboat sail and method of manufacture thereof, the sail material being chosen from a group of materials which lay substantially flat at all points when laid against a planar surface but which stretch under wind loading when attached to a sailboat to a... | 09/23/2003 |
| 6431100 | Stowable semi-rigid wing sail system 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 star... | 08/13/2002 |
| 6170421 | Apparatus for sails A sail envelope has an internal mast or spar and one or more profiles (1) that is or are free to rotate relative to the longitudinal axis of the mast. Each profile has an outer edge in the form of a symmetrical aerofoil upon which the inner sides of the e... | 01/09/2001 |
| 6148753 | Reconfigurable foresail A system is provided for changing the shape of a foresail from a spinnaker shape to a Genoa shape through the utilization of a tensioning line which runs from the head of the spinnaker shaped sail to its tack. Tensioning of this line provides that the fla... | 11/21/2000 |
| 6141809 | Wing profile sail A wing profile sail is in the form of a sailcloth which defines an airfoil-shaped space, which is filled with air through openings or one-way closing mechanisms. At the sail's luff (1) there is provided a bag/lung-shaped body which can be filled with air ... | 11/07/2000 |
| 6112688 | Sail for a wind-powered vehicle A sail for a wind powered vehicle such as a surfboard, sailing boat or the like is provided wherein a sail is connected along its front edge to a mast and wherein the said at its clew or at its lower edge is connected to a boom. The boom is connected in a... | 09/05/2000 |
| 5931109 | Sail A sail, according to one aspect of the present invention, comprises an inner membrane and two outer membranes, each attached substantially around the periphery of a respective side of the sail to form a respective pocket. The camber of the inner membrane ... | 08/03/1999 |
| 5575233 | Monoplane and low thrust wingsail arrangements A wingsail assembly comprising a thrust wing having a leading aerofoil (1) and a trailing aerofoil (2), the leading and trailing aerofoils being deflectable with respect to one another to adopt a cambered configuration, characterised in that the trailing ... | 11/19/1996 |
| 5423276 | Camber control sail system An improved sail (20) is attached along its luff portion to a mast (26). A pair of control battens (34) extend across the sail (20). A forward camber control handle (36) attaches to the mast (26) and an aft camber control handle (44) secures to the sail (... | 06/13/1995 |
| 5406902 | Method and apparatus for optimum sail shaping A boom for a sailboat is controllably flexible to assume a predetermined specific airfoil-derived contour and to impose an aerodynamically efficient shape on the large lower portion of the sail. The boom is formed of five segments connected by four flex j... | 04/18/1995 |
| 5144903 | Yacht and yacht model A yacht model or a full scale yacht includes a hull and a mast is provided on the hull to extend upward from the hull to support a main sail. A spinnaker is provided in front of the mast and the spinnaker is made of a plastic material and formed in a bulg... | 09/08/1992 |
| 5115754 | Adjustable spreader arms for sailing graft A system for adjusting spreaders and diamonds on sailing boats, the system being adapted to provide spreaders or diamonds which are adjustable on the water thus allowing the craft's crew greater control of the sailing rig. The system has a pair of spreade... | 05/26/1992 |
| 5046440 | Sail rig and staysail system A sail rig for a sailing vessel or a vessel provided with auxiliary sail propulsion comprises a mast, a continuous yard/boom provided on the mast, a backstay, a main sail located between the mast and the backstay, a forestay and a foresail mounted on the ... | 09/10/1991 |
| 4982679 | Wingsail flap torque equalization A deflection system for wingsail assemblies in which the deflection is performed by fluid operated cylinders that are inter connected in such a way that the wingsail element is moved by a co-operative push pull action from the annulus side of one cylinder... | 01/08/1991 |
| 4945847 | Wingsail flap deflection system A method of operating a multi-element self-trimming sailset to assist deflection of the trailing element of the main thrust wing to either side of the leading element. The sailset is first rotated to reduce the moment of wind on the flap opposing deflecti... | 08/07/1990 |
| 4879961 | Sail airfoil device An airfoil device includes an inflatable structure for attachment to an existing sail to form a sail assembly. The inflatable structure is dimensioned and arranged to extend over a substantial portion of the existing sail and a valve arrangement is includ... | 11/14/1989 |
| 4856449 | Wingsail stalling Wingsail configurations for multi element wingsails for maintaining full stall for maximum speed in running downwind in which the trailing edges of at least a pair of flap elements of a multi element structure are maintained in the convergent configuratio... | 08/15/1989 |
| 4848258 | Airfoil sailing system An airfoil system for use on water vessels is described. A plurality of fore and aft symmetrical sails are arranged to form an asymmetrical two surface airfoil. The individual sails may be rotated to allow tacking. The parameters of sail configurations de... | 07/18/1989 |
| 4815407 | Rigging, in particular for a sail board Rigging for nautical or terrestrial craft comprising a sail (1) integral with a mast hinged to the craft. According to the invention, the sail (1) is stretched onto symmetrical uprights (2) which are themselves bent by a cable (7) tensioned by a hoist (10... | 03/28/1989 |
| 4685410 | Wing sail An airfoil sail system for a boat having a mast is disclosed. The airfoil sail system includes a front airfoil which is pivotal about an axis defined by the mast. The front airfoil has leading and trailing edges, and is generally symmetrical about a verti... | 08/11/1987 |
| 4669409 | Wind ship propulsion system A sailing rig which comprises a rigid airfoil, with intakes on either side of its front. Air is drawn through the leeward intake into a front compartment, then by fan to a pressurized rear compartment, where it exits via a rearwardly directed jet nozzle o... | 06/02/1987 |
| 4646670 | Sail system for sailboards, and boardsailing apparatus and method 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 ... | 03/03/1987 |
| 4610213 | Pressure sensing on rigid sails Pressure tapping for rigid sails, the tappings (10, 11, 12, 15, 16) being located to either provide a stall warning or to enable tuning of the sailset to the desired operating angles. A particular flow-state sensitive stall warning device is also describe... | 09/09/1986 |
| 4563970 | Sail with retractable air directing element A sailset comprising a leading aerofoil and a trailing aerofoil that pivots about an axis passing through the leading aerofoil. A third comparatively small aerofoil is retractable within the leading aerofoil and extendable downwind of the trailing edge of... | 01/14/1986 |
| 4561374 | Wind ship propulsion system A rigid or semirigid sailing rig having an airfoil shaped mainsail, hinged at its luff to an airfoil shaped jib pivotable at the hinge axis 25° to either side of the mainsail's centerline to form a continuous airfoil which is smoothly curved on the lee s... | 12/31/1985 |
| 4503796 | Rotatable spar A rotatable spar apparatus for controlling and adjusting sail shape which includes a curved, rigid spar which is arranged to reverse its curvature when tacking. Additionally by controlling the degree of rotation it may be used as a draft control device.... | 03/12/1985 |
| 4467741 | Sail arrangements A wingsail has two rigid symmetrical aerofoil section sail sections (10, 12) which are mounted one downstream of the other, the trailing sail section (12) being freely pivotally mounted to the center line of the leading sail section (10) so that its leadi... | 08/28/1984 |
| 4437426 | Wing type air foil assembly The present invention relates to a wing type air foil assembly that is adapted to be utilized by boats or vessels, or even vehicles, that is designed to function in the same general manner as a wind sail for providing driving thrust to the vessel or vehic... | 03/20/1984 |
| 4432298 | Hydrofoil sailing craft A hydrofoil sailboat comprises forward and aft surface piercing hydrofoils and an asymmetrical wingsail. Both hydrofoils have an inverted arch configuration and have a cross-section which is approximately a circular segment. The wingsail has a reversible ... | 02/21/1984 |
| 4402277 | Aerofoil sail An aerofoil sail has a rigid main panel (10) pivotally mounted to a hull (17) about a vertical axis (15) with trailing a flap (12A) hinged (14) to one side of the main panel. The trailing flap comprises a series of separate flaps (12A' ,12A" ,12A'") indiv... | 09/06/1983 |
| 4369724 | Wingsail 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 curvatur... | 01/25/1983 |
| 4341176 | Air foil with reversible camber A reversible airfoil generally wing-like in shape comprising at least two spaced apart rigid spars having at least two slots therethrough, bars projecting through the slots in each rigid spar, each end of each bar attaching to a flexible slat, and a commo... | 07/27/1982 |
| 4273060 | Sailing vessel The sailing vessel of the present invention includes a hull of omnidirectional construction, and a generally triangular sail which is supported along two side edges, with the third side edge unsupported and extending generally horizontally. The angular po... | 06/16/1981 |
| 4074647 | Sailing rig having camber adjustments 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 be... | 02/21/1978 |
| 3934533 | Aerofoil or hydrofoil A reversible aerofoil or hydrofoil has a central panel with lateral panels hinged thereto. The section of the central panel is symmetrical on either side of a central axis and the lateral panels are of similar section to each other. Either of the lateral ... | 01/27/1976 |
