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WO2003082667A1 - Systeme de navigation a voile semi-rigide escamotable - Google Patents

Systeme de navigation a voile semi-rigide escamotable Download PDF

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Publication number
WO2003082667A1
WO2003082667A1 PCT/US2002/007887 US0207887W WO03082667A1 WO 2003082667 A1 WO2003082667 A1 WO 2003082667A1 US 0207887 W US0207887 W US 0207887W WO 03082667 A1 WO03082667 A1 WO 03082667A1
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WO
WIPO (PCT)
Prior art keywords
sail
panels
boom
starboard
port
Prior art date
Application number
PCT/US2002/007887
Other languages
English (en)
Inventor
Charles Allen Abshier
Original Assignee
Charles Allen Abshier
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Charles Allen Abshier filed Critical Charles Allen Abshier
Priority to PCT/US2002/007887 priority Critical patent/WO2003082667A1/fr
Priority to AU2002255758A priority patent/AU2002255758A1/en
Publication of WO2003082667A1 publication Critical patent/WO2003082667A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H9/00—Marine propulsion provided directly by wind power
    • B63H9/04—Marine propulsion provided directly by wind power using sails or like wind-catching surfaces
    • B63H9/08—Connections of sails to masts, spars, or the like
    • B63H9/10—Running rigging, e.g. reefing equipment
    • B63H9/1021—Reefing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H9/00—Marine propulsion provided directly by wind power
    • B63H9/04—Marine propulsion provided directly by wind power using sails or like wind-catching surfaces
    • B63H9/06—Types of sail; Constructional features of sails; Arrangements thereof on vessels
    • B63H9/061—Rigid sails; Aerofoil sails
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H9/00—Marine propulsion provided directly by wind power
    • B63H9/04—Marine propulsion provided directly by wind power using sails or like wind-catching surfaces
    • B63H9/06—Types of sail; Constructional features of sails; Arrangements thereof on vessels
    • B63H9/061—Rigid sails; Aerofoil sails
    • B63H9/0621—Rigid sails comprising one or more pivotally supported panels
    • B63H9/0635—Rigid sails comprising one or more pivotally supported panels the panels being pivotable about vertical axes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H9/00—Marine propulsion provided directly by wind power
    • B63H9/04—Marine propulsion provided directly by wind power using sails or like wind-catching surfaces
    • B63H9/06—Types of sail; Constructional features of sails; Arrangements thereof on vessels
    • B63H9/067—Sails characterised by their construction or manufacturing process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H9/00—Marine propulsion provided directly by wind power
    • B63H9/04—Marine propulsion provided directly by wind power using sails or like wind-catching surfaces
    • B63H9/06—Types of sail; Constructional features of sails; Arrangements thereof on vessels
    • B63H9/067—Sails characterised by their construction or manufacturing process
    • B63H9/0671—Moulded sails
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H9/00—Marine propulsion provided directly by wind power
    • B63H9/04—Marine propulsion provided directly by wind power using sails or like wind-catching surfaces
    • B63H9/06—Types of sail; Constructional features of sails; Arrangements thereof on vessels
    • B63H9/067—Sails characterised by their construction or manufacturing process
    • B63H9/0673—Flying sails, e.g. spinnakers or gennakers

Definitions

  • the invention herein relates to sails, specifically wing sails for wind powered craft.
  • N.A.C.A. 653-418 wing section by John H. Quinn Jr., 1944, wing section with boundary layer control by suction through a span wise slot at the point of separated flow in the leeward surface.
  • a mechanical pump provides suction.
  • the solid wing section as described is a one direction lifting airfoil. Intended for, and suitable only for "heavy displacement aircraft".
  • Airfoils of single panel sailcloth suffer a substantial loss of efficient use of the winds power. Which can be as much as a 17 to 37% loss of efficiency, when compared to wing sails. Rating reference; The Cruising Catamaran Advantage, page 165, by Rod Gibbons, 1988, Island Educational Publishing. Many changes of sails are required for different wind conditions. Also they require constant adjusting to control their airfoil shape. With a shaped mast there is only a slight increase in efficiency. This efficiency is increased slightly more with the masts ability to rotate its leading edge toward the wind. Standard sails are the most widely used, whether for working, sport, or pleasure craft. These sails are inefficient, and are not safe to use, because they are not easy to change.
  • roller reefing systems were introduced, such as Ted Hoods' Jib-Furling Stay, Pat.# US3611969 in 1971.
  • Ted Hoods' Jib-Furling Stay Pat.# US3611969 in 1971.
  • the sails made for roller reefing systems are soft, and do not hold their airfoil shape sufficiently.
  • a stowable wing comprises "dual semirigid sail panels” that furl (unfold) or reef (fold down), has an automatic draft (thickness of wing) adjusting boom that bends to the shape of a wing or opens as a spinnaker sail.
  • Wing sail shape is comprised of "smooth laminated lightweight cored” sail panels, with shape control springlines, twin booms, and spare sail pockets.
  • Fig. 1 shows a side view of a laminated panel with peeled back layers.
  • Figs. 1A and IB show side views of sail panels with foam core sections.
  • FIG. IC shows a detail view of Fig. IB leach with sailcloth peeled back.
  • Fig. 2 shows a forward perspective view of a stowable wing.
  • Fig. 2 A shows a side view of a gaff rigged wing sail.
  • Fig. 2B shows a side view of a square rigged wing sail opened as a spinnaker sail.
  • Fig. 2C shows a side view of a Chinese lug rigged wing sail.
  • Fig. 2D shows a side view of a Bermudan rigged wing sail.
  • Fig. 3 shows a cross sectional view of an outside fold at full draft with slots.
  • Fig. 3 A shows a cross sectional view of Fig. 3 in an alternate movement with airflow applied to the forward left.
  • Fig. 3B shows a view of Fig. 3 in an alternate movement with airflow applied from behind.
  • Fig. 4 shows a vertical cross section view through a downhaul position of a panel.
  • Detail Fig. 4 A shows detail view of Fig. 4 with a jammed downhaul line at an inside fold.
  • Detail Fig. 4B shows detail view of Fig. 4 with a jammed downhaul line at a reef position.
  • Detail Fig. 4C shows detail view of Fig. 4 with a freed downhaul line at the boom.
  • Fig. 5 shows a cross sectional view of wing sail inside fold with shape control springlines.
  • Fig. 5 A shows a cross section view of spinnaker sail as an alternate movement of Fig. 5.
  • Fig. 6 shows a perspective view of a mast section with attached foreboom, foreboom brace, and extending boom with eyebolt.
  • Fig. 6A shows Fig. 6 with addition of spinnaker and draft arms attached with pins.
  • Fig. 6B shows Fig. 6A with addition of full draft booms attached by pins and coil springs.
  • Fig. 6C shows a top view of full draft boom of Fig. 6B.
  • Fig. 6D shows a top view of minimum draft boom, alternate movement of Fig. 6C.
  • Fig. 6E shows a top view of spinnaker sail boom, alternate movement of Fig. 6C.
  • Fig. 6F shows a view of Fig. 6A with alternate foreboom and brace goosenecks fitted to bands.
  • Fig. 7 shows a side view of interior of port panel.
  • Figs. 7 A through 7 I show cross sectional views of wing interior.
  • Fig. 8 shows a side view of starboard side of wing.
  • Fig. 8 A shows an end view from back of wing.
  • Fig. 8B shows an end view from front of wing.
  • Fig. 8C shows a view from back of opened wing.
  • Fig. 8D shows a side view from starboard of opened wing.
  • Detail Fig. 8E shows detail of headboard roller.
  • Fig. 9 shows an end view from front of wing beginning to fold first panel
  • Fig. 9A shows an end view from front of wing with first panel halfway folded.
  • Fig. 9B shows an end view from front of wing with second panels beginning to fold.
  • Fig. 9C shows a view from front of wing with second panels halfway folded.
  • Fig. 9D shows a view of cross section of 9 A.
  • Fig. 9E shows a view of cross section of 9C.
  • Fig. 9F shows a side view of a stowed wing sail.
  • the stowable wings' semi rigid sail panels (Fig. 1) 10 are produced with a thin foam core 11.
  • the closed cell foam cores' material is "noncrosslinked polyvinyl chloride foam".
  • the PVC foam core is known by its trademarked name as Airex, and is available from Torin Inc., 9 Industrial Park, Waldwick, N.J. 07463.
  • the core has a memory shape characteristic, after bending it returns to its original shape.
  • These sail panels' interior and exterior surfaces are laminates of "lightweight sail makers' materials" 12.
  • the laminated sailcloth provides a smooth, durable surface that is ultraviolet protection for the core.
  • the strength of the individual panel materials is increased substantially by lamination. This allows the decrease in the thickness and weight of the materials, required for the strength of this wing sail panel.
  • the manufacture (lofting) of the sail panels is accomplished with the use of laminating adhesive.
  • the major change in the process of lofting the Sto-Wing panels, from standard sail lofting, is the addition of foam core.
  • the stowable wings' whole sail panels 10 are lofted with the core being, "multiple horizontal panel sections" 13.
  • the core panel sections are spaced with a small gap, or groove between their top and bottom edges 14. This is for the sail panels to fold where they are gapped.
  • the sail panels are made of two vertical sections (Figs. 1 A and IB).
  • the vertical trailing section (Fig. IB) overlaps the exterior of the vertical leading edge section (Fig. 1 A), and they are stitched together at their inside folds 16.
  • the stowable wing is formed of "inversely twin sail panels".
  • the best outline shape of the stowable wing would be “round headed full roach” (Fig. 2) 15. However, it can be designed aesthetically, to replace any of the more traditional outline shapes.
  • the stowable wing is assembled, by attaching the foot of the sail panels 57 with a backer strip 47, and screws 58 to their respective sides of the boom 46.
  • the backer strip extends from the clew of the booms, to a point close to the tack of the booms 81.
  • the backer strips not continuing to the tack, are to facilitate the folding of the foot panels at the tack, as the panels need to unbend and rebend, to fold down.
  • a wing sail is formed surrounding the mast 17 as a backbone.
  • the boom parts the sail panels at the clews 18 (Fig. 6E), forming a spinnaker sail 19 in front of the mast (Fig. 8D).
  • the "rounded head shape" of the wing sail panels have an additional advantage for its selection in the preferred embodiment.
  • the "rounded full roach” forms a "spinnaker sail shape", with the dual panels parted (Fig. 8C).
  • the foam core is cut, thinned or voided at the bottom of each panel section (Figs. 1 A, IB,) 20, that folds down. Which is the upper panel of two panel sections making an inside fold 16.
  • the shape of this cut is an upward cambered curve close to the shape of the full draft boom 82 (Figs. 9D, 9E). This softer panel area eases the folding of the "cambered rigid panels", over the booms' airfoil shape 21.
  • FIG. IB Another softer panel section also aids in the folding down of the rigid panels, the foam core is cutout, or thinned 23 (Fig. IB, IC) in half elliptical shapes.
  • the soft panel side section is along the outside fold 22 cross section areas, beginning at the midchord section of the wing sail panel area, to the trailing edge.
  • An additional purpose for this core thinning is to form a windward concave depression 24 (Fig. 3A). This speeds up the flow of wind leaving the windward side of the wing sail. Which essentially, creates a wing with a lower stall speed.
  • Each of the stowable wings' sail panels has a span wise slot 25 (Fig. 2) at forty five percent abaft the leading edge.
  • the trailing part of the sail panel overlaps the leading part of the sail panel at these slots (Fig. 3, 3 A, 3B) 26.
  • the slots are joined together at every inside fold (Fig. 5).
  • the outside fold is allowed to expand the slot by the force of the airflow on it (Figs. 3, 3 A).
  • the slots remove an amount of air equal to the disturbed boundary layer, at the same rate of speed as the air is flowing.
  • the wing sail panels' slots function alike. In aerodynamic terms, the slots are referred to as a "high lift device". DESCRIPTION OF INVENTION - Preferred Embodiment - continued
  • the port and starboard sail panels fold simultaneously.
  • the stowable wing remains an airfoil in use when raising or stowing the panels (Fig's. 9, 9A). This is for optimum performance while changing the amount of sail area exposed to the wind.
  • the stowable wing downhaul lines (Fig. 4) 31 extend from their attachment at the headboard 83, through downhaul jams 32 and the boom pad eye 55 guide hole 56, to the cockpit of the craft.
  • the downhaul line material is a low stretch polyester (rope).
  • the downhaul jams keep the upper panels in flat sections by being clutched in downhaul jams 32 (Fig. 4A).
  • the downhaul jams are sailcloth tabs 84, with two grommets 33, and are located at each inside folds' midsection (Figs. 5A, and 7A thru 7G).
  • the grommets 33 of the jam are misaligned to grip the downhaul line (Fig. 4B).
  • the grommets release the downhaul line upon reaching the boom, by becoming aligned (Fig. 4C).
  • the two part sail panel section above the freed line is then allowed to fold down.
  • the grommets' material can be brass, stainless steel, neoprene rubber, or nylon.
  • Shape control springlines 34 are located horizontally along each of the inside fold sections of the sail panels. They bend the sail panels' draft outward, and the leading edges (luff) in an elliptical shape, and are the adjustment for camber of the sail panels.
  • the shape control springline is attached to the "foam cored extended leach tab" 35, and led through the midchord reef ring 36. From the midchord ring the line is led through the tack reef ring 37, and threaded through a grommet 38 at the luff of both sail panels (Fig. 2). The line is then led through the reef rings of the other panel, to its extended leach tab.
  • the springline keeps the dual panels leading edges in line with, and close to each other.
  • cambered tack 53 at the foot of the sail panel which needs to straighten out for reefing, is secured with a shorter springline 54 from the boom midsection pad eye 72.
  • the downhaul jams are held out in tension by these springlines.
  • the stowable wing requires a freestanding spar (mast) 17 for its operation. This is to eliminate the complexity of the design that would be needed to work around standing rigging and spreaders.
  • the heads of both stowable wing sail panels are joined together abaft the mast by a shackle 69 to dual halyards 41.
  • a shackle 69 Between the sail panel's heads, there is a headboard roller 70 (Detail Fig. 8E), which reduces the friction of the shackle against the mast.
  • the shackle 69 attaches the head of the panels on each side of the roller.
  • the halyards are led about the mast port and starboard, from sheaves 42 in the fore of the mast.
  • the head of the sail panels are battened 44 (Fig. 1 A) to hold the rounded roach shape out fore and aft of the mast to extend the catenary lines (lines of force between the boom and head of sail). This places the forward catenary line of force close to the leading edge of the wing sail. Which makes the luff (leading edge) more rigid, in its hoisted tension from the boom.
  • the stowable wing panels enclose the mast as a backbone, and their alignment across the mast is balanced for easier and safer handling of the wing sail system.
  • the mast is situated abaft the leading edge, at forty percent of the wing sails' chord. Which, for light winds, the leverage of the sail panels' trailing section to the forward section is, one and a half times (Figs. 6C, and 71).
  • the mast is situated abaft the leading edge, at thirty percent of the wing sails' chord (Fig. 6D).
  • the leverage of the sail panels' trailing section to the forward section is, two and a third times.
  • the wing sails' forward position places its' center of effort closer to the location for which an existing mast, was designed for on most sailing craft.
  • the stowable wing has a foreboom 45 (Fig. 6), that swings about in front of the mast.
  • the foreboom is attached with screws 58, as shown in (Fig. 6).
  • the fixed foreboom band 77, and brace band 78 (Figs. 6F) are attached with screws 58 to the mast.
  • the foreboom and foreboom brace gooseneck fittings 79 and 80, are attached to the fixed foreboom bands with pins 67.
  • the twin flexible booms 46 (Fig. 6B) are jointed to swing backward in the form a wing, or open as the shape of the foot of a spinnaker (Fig. 6 E).
  • the booms' jointed forward ends are mounted with a pin 67, to the end of an extending boom 48 that slides fore and aft in the foreboom 45. DESCRIPTION OF INVENTION - Preferred Embodiment - continued
  • the extension boom has a lengthwise slot 73 (Fig.6) in its top surface that, in communication with an eyebolt 52 in the top of the fore boom, keeps the extension boom from sliding out of the fore boom.
  • the booms form the sail panels into an elliptical leading edge when bent backward into an airfoil shape.
  • the booms are supported off of the fore boom, port and starboard, by articulated control arms (Fig. 6A), which consist of the spinnaker extension arms 49 that are jointed off of each side of the fore booms' forward end, and the draft control arms 50 that are jointed off of the spinnaker extension arms.
  • the draft control arms ends are jointed to the booms' 46 (Fig. 6B) pad eyes 55, and all the joints are secured with pins 67.
  • Coil springs 51 are connected between the booms' pad eyes 55, and the fore booms' eyebolt 52.
  • the coil springs are the tension for joining the booms together in a wing shape, and for keeping the extending boom, and draft control booms forward.
  • the spinnaker setting is the strongest tension on the springs (Fig. 6E), and the least tension is the full draft wing shape (Fig. 6C).
  • the booms are formed in the full draft shape, to provide springability against the minimum draft shape (Fig. 6D). Therefore, less airflow is required to open the spinnaker, than to reduce the draft of the wing. Because the airfoil presents less area to the airflow, when used in a wing shape, than it does as a spinnaker shape.
  • the materials for the moving parts of the boom can be aluminum, steel, carbon fiber, or fiber reinforced plastic. Materials for parts change with the size of the sail, and mounting structure, for a particular size of sailing craft.
  • the coil springs are steel, and the booms are wood, laminated wood, carbon fiber, or fiber reinforced plastic.
  • the springlines are bungee cords.
  • a pad eye 55 (Fig. 6B) is mounted on the inside of each boom, port and starboard, at forty percent abaft the leading edge. The pad eyes are for jointed attachment of the draft adjust control arms.
  • a guide hole 56 in each pad eye is for the downhaul lines to correctly align the sail panels as they are folded down.
  • the pad eye has a hole 72 at its forward end, and is for the connection of the tack springline 54 (Fig. 7H), and for hooking of the coil spring. Also, the midsection reef hooks are attached to the after end of these pad eyes, to align them with the reef rings.
  • boom vang lines 71 (Fig. 6E), which limit the boom ends from lifting, or bending too far.
  • Each vang line is attached from its respective boom cap bail 60, to the fore boom bottom brace (Fig. 6) 47. Thereby, making it possible to use the spinnaker sail without sheets at the clews.
  • reef hooks 39 Located along the inside of the booms are reef hooks 39 that, hook on reef rings attached to the sail panels midsection downhaul jams 36, and on reef rings at the tack 37, and clew 40.
  • a spring loaded line (Fig. 8C) 61 keeps all reef hooks fastened; the opposite end of that line is led to the cockpit for releasing the hooks.
  • a pocket of sailcloth 62 (Figs. 2, 4) is for stowage of spare folded sail panels.
  • the folded rigid panels would not be handily stowed elsewhere.
  • the twin stowage pockets are joined together at their leading edges.
  • the spare sail stowage pockets increase the total sail area, and the booms uni-lateral strength.
  • a dual panel sail cover (Figs. 2, 4) 65 when not protecting the stowed sail folds down.
  • the cover closes the opening at the foot of the wing sail, to prevent over ventilating the interior of the wing sail.
  • the lashed panels of the cover 66 round the foot of the wing sails' leading and trailing edges, for a decrease of induced drag.
  • the cover has a batten 44 in each of its fabric panels at their leading and trailing edges, which keeps the covers shaped.
  • the following is an example of the lightweight characteristics of a medium aspect ratio (span to chord ratio), eight meter high stowable wing;
  • the foam core at the head of the sail panels for this example is a nine pound per cubic foot density, the midsection sail panels are six pound density, and half of the total sail area; toward the foot sections are four pound density.
  • the softer sections are not cored thinner; they are voided of core material. Because of the core voids, this sail panel's area is fifty five percent cored, at 3.25 mm. thick.
  • the span wise slots luff (leading edge) and leach (trailing edge) of the sail panels have extra reinforcing with a highly oriented aramid fiber material.
  • this panel sections' weight is 5.91 ounces per sail makers' yard.
  • the average overall weight of the entire sail panel per square sail makers' yard is 3.98 ounces.
  • the average overall weight of the stowable wing by multiplying the dual sail panels is, 7.96 ounces per square sail makers' yard.
  • the dual paneled stowable wing that replaces the main, jib, and spinnaker sails, is comparable in weight aloft to a regular single panel eight ounce mainsail.
  • the stowable wing significantly increases power from the wind, for sailing craft. This includes the weight of dual panels having a fully rigid leading section, and a trailing section fully battened with foam core.
  • My lightweight Stowable Semi Rigid Wing Sail System is a significant improvement over all other airfoils for wind powered craft, with its multiple sail shape settings, automatic draft adjustment, drag reductions, and high lift devices. Thus, all useable wind conditions can be utilized for one hundred percent efficient use of the winds power.
  • FIG. 2A, 2B, 2C, and 2D Additional embodiments are shown in (Figs. 2A, 2B, 2C, and 2D); in each case the slots, panel folding, downhauls, shape control lines, and boom arrangement with its automatic draft adjustment, and parting into a spinnaker sail, are typical of the preferred embodiment.
  • a gaff rig (Fig. 2 A) wing sail is shown in its wing sail shape by the use of dual sprit booms 76 at the head of the sail.
  • a square rig (Fig. 2B) wing sail is shown in its spinnaker sail shape by the use of dual sprit booms 76 at the head of the sail.
  • the foam cores are omitted in a cambered shape 74, representing the space between square sails.
  • Clear MYLAR is laminated on each side of a SPECTRA webbing, in these core omission sections.
  • a Chinese lug rig (Fig. 2C) wing sail is shown in its wing sail shape by use of dual sprit booms 76 at the head of the sail.
  • a Bermudan rig (Fig. 2D) wing sail is shown in its wing sail shape with the foot boom arrangement angled over the stowage pockets, to facilitate easier folding of the panels.
  • the stowable wing is a significant improvement over all other wings and sails, in its abilities for easy and safe operation;
  • the wing sail setting can point closer to the upwind direction, thus making fewer tacks with the wing sail, for the sailing craft to arrive at a desired location.
  • the stowable wing reduces a higher percentage of drag vortices than other airfoils, and increases lifting power of the wing sail system by several measures;
  • the manner of using the stowable wing as a sail for wind powered craft is similar to the operation of other sail powered systems. All stowable wing sail system settings can be easily, and safely singlehanded from the cockpit.
  • the stowable wing to be one airfoil for all useable wind conditions there are half as many running rigging lines as other sail powered configurations.
  • the stowable wings' running rigging consists of two halyards 41 for raising sail, which also control headsail twist. There is one line that releases the spring loaded reef hooks 61.
  • Sheets (Fig. 6E) 59 port and starboard are attached to their respective sail panels clew 18 at their boom cap bail 60, and are then led through deck blocks to the cockpit.
  • the sheets, deck blocks, and rotating mast brake would come as existing hardware with the sailing craft of this preferred embodiment).
  • the sheets are used to haul the stowable wing around for selecting the attack angle of the wind.
  • the rotating mast brake sets attack angles of both the wing, and spinnaker sail, with an operating line to the cockpit.
  • the last reef is the stiff cored, heavily reinforced head of the stowable wing sail.
  • the spare sail pockets are accessed by opening flaps 63 (Fig. 8C) at the clew.
  • the hanked on sails in use fold down over the stowage pockets when reefing.
  • the sheets running through the pockets bottom clew corners 64 bend the stowage pockets toward the wind.
  • the venturi effect causes air to suck into the wing sail at the leeward vertical slot 30.
  • the spinnaker set stowable wing has substantially improved airflow, because of the slots (Fig. 3B) 25.
  • any point of sail will automatically set an efficient airfoil, with the exception of steering the craft directly into the wind.
  • the wing sail will perform well enough without bending the boom, by simply heading the craft more toward the wind.
  • the mast brake loose, and allowing the wind to turn the wing sail toward an attack angle of the wind. Then setting the mast brake, and turning the craft away from the wind slightly. The windward panel will flatten, and the resulting shape of the wing sail will be effective for short tacks.
  • the stowable rigid wing sail system of this invention can be used safely for wind powered craft, with increased speed of the craft, and that it adds convenience to a challenging task.
  • the stowable wing sail panel has the additional advantages in that;
  • this wing sail substantially lowers its designed height, and aspect ratio, to equal the same power achieved by standard wings or sails. Therefore, the stowable wing has lower centers of both gravity, and effort. Which translates to less heeling, and further improved efficiency by the wing sail standing up to the wind, for less airflow to spill off.
  • the foam cores can be constructed with a different material, which would not have the qualities preferred.
  • the sail panels can be laminations of sailcloth, with no foam core.
  • the wing sail can be efficient without the high lift devices made into its panels.
  • the wing sail can fold all at once as accordion folds, by not having the downhauls with jams. Also, the sail panels can fold down without the core cutouts.
  • the fore boom can be attached to a nonrotating mast with a fixed gooseneck fitting, or a stay wire can replace the mast as the backbone of the wing, both would have extra sheets taking the place of the mast brake.
  • the mast or a stay can form the leading edge within the wing, and loose the automatic draft reduction, to be manual draft reduction.
  • the boom can be a single part that functions as a wraparound leaf spring etc.
  • the wing sail can be hoisted by using only one halyard.

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  • Wind Motors (AREA)

Abstract

Un ensemble surface portante semi-rigide escamotable fonctionne automatiquement avec un flux d'air en tant que voile ajustant le creux de la voile, ou en tant que spi (19), cet ensemble surface portante étant destiné à être utilisé sur un mât (17) avec une drisse (41) sur un engin propulsé par le vent. La drisse couplée aux têtières (83) des panneaux (10) de laize babord et tribord entourant le mât verticalement, étire la surface portante depuis une bôme (21) en forme de partie de corde de voilure attachée à la bordure (57) des surfaces de voilure. Les panneaux en toile à voiles (12) sont recouverts de parties (13) de panneaux horizontaux à âme (11) en mousse dure prévus entre des espaces (14) de toile à voiles souple, pour replier les panneaux rigides au-dessus de la bôme en forme d'aile. La partie supérieure des sections de panneaux se trouvant au-dessus de la bôme définit des espaces de pliage (22) vers l'extérieur et un espace sur deux jusqu'en haut de la voile se replie vers l'extérieur alors qu'un espace sur deux des autres espaces se replie vers l'intérieur (16) et se trouve plus éloigné (20) entre les panneaux rigides. Les bords avant (27) desdits panneaux sont reliés au niveau des espaces à pliage vers l'intérieur. Les panneaux de voile comportent des lignes (34) commandant la forme situées le long des plis vers l'intérieur pour produire un profil à section de corde de voilure. Des lignes (31) de halebas arrisent et serrent les panneaux de voile. Le bord avant de la bôme fait pivoter les deux côtés arrière de la bôme par rapport au mât. Le bord avant pivotant de la bôme souple est couplé à une bôme avant (45) télescopique (48) qui est distalement couplée au mât. Des connexions pivotantes du spi (49) et des bras (50) de commande du creux, se trouvant entre la bôme avant et les côtés intérieurs de la bôme (55) ajustent le creux de la voile de navigation.
PCT/US2002/007887 2002-03-15 2002-03-15 Systeme de navigation a voile semi-rigide escamotable WO2003082667A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US2002/007887 WO2003082667A1 (fr) 2002-03-15 2002-03-15 Systeme de navigation a voile semi-rigide escamotable
AU2002255758A AU2002255758A1 (en) 2002-03-15 2002-03-15 Stowable semi-rigid wing sail system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2002/007887 WO2003082667A1 (fr) 2002-03-15 2002-03-15 Systeme de navigation a voile semi-rigide escamotable

Publications (1)

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WO2003082667A1 true WO2003082667A1 (fr) 2003-10-09

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010007377A3 (fr) * 2008-07-18 2010-05-27 Barron Michael Arrangements de voile et arrangements aérodynamiques reconfigurables
WO2012020441A2 (fr) 2010-08-12 2012-02-16 Nautigest S.R.L. Structure de voile à surface portante améliorée, ou "voile en aile d'avion"
USD714712S1 (en) 2012-11-28 2014-10-07 Robert Reginald Bray Wingsail propelled boat
USD720280S1 (en) 2013-05-06 2014-12-30 Robert Reginald Bray Wingsail
CN104890845A (zh) * 2015-06-23 2015-09-09 江苏科技大学 横向可折叠自动收放翼型帆

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* Cited by examiner, † Cited by third party
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US4344377A (en) * 1978-05-16 1982-08-17 Gram Knud F Sail craft
US4388888A (en) * 1981-04-24 1983-06-21 Gushurst Jr Fred W Adjustable airfoil
US4402277A (en) 1980-11-21 1983-09-06 Barry Wainwright Aerofoil sail
US4895091A (en) 1988-10-17 1990-01-23 Elmali Nuri E Reversible camber line flexible wing sail
US5271349A (en) 1989-09-15 1993-12-21 Giorgio Magrini Wing sail structure
US20010047745A1 (en) * 2000-03-24 2001-12-06 Abshier Charles Allen Stowable semi-rigid wing sail system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2107303A (en) 1934-09-17 1938-02-08 Ljungstrom Fredrik Rig for sailboats
US4344377A (en) * 1978-05-16 1982-08-17 Gram Knud F Sail craft
US4402277A (en) 1980-11-21 1983-09-06 Barry Wainwright Aerofoil sail
US4388888A (en) * 1981-04-24 1983-06-21 Gushurst Jr Fred W Adjustable airfoil
US4895091A (en) 1988-10-17 1990-01-23 Elmali Nuri E Reversible camber line flexible wing sail
US5271349A (en) 1989-09-15 1993-12-21 Giorgio Magrini Wing sail structure
US20010047745A1 (en) * 2000-03-24 2001-12-06 Abshier Charles Allen Stowable semi-rigid wing sail system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010007377A3 (fr) * 2008-07-18 2010-05-27 Barron Michael Arrangements de voile et arrangements aérodynamiques reconfigurables
WO2012020441A2 (fr) 2010-08-12 2012-02-16 Nautigest S.R.L. Structure de voile à surface portante améliorée, ou "voile en aile d'avion"
USD714712S1 (en) 2012-11-28 2014-10-07 Robert Reginald Bray Wingsail propelled boat
USD720280S1 (en) 2013-05-06 2014-12-30 Robert Reginald Bray Wingsail
CN104890845A (zh) * 2015-06-23 2015-09-09 江苏科技大学 横向可折叠自动收放翼型帆

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