WO1990002682A1 - Sailboard reefing system - Google Patents

Sailboard reefing system Download PDF

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Publication number
WO1990002682A1
WO1990002682A1 PCT/US1989/003812 US8903812W WO9002682A1 WO 1990002682 A1 WO1990002682 A1 WO 1990002682A1 US 8903812 W US8903812 W US 8903812W WO 9002682 A1 WO9002682 A1 WO 9002682A1
Authority
WO
WIPO (PCT)
Prior art keywords
sail
reefing
boom
attaching
sailboard
Prior art date
Application number
PCT/US1989/003812
Other languages
French (fr)
Inventor
John G. Rupert
Original Assignee
Rupert John G
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 Rupert John G filed Critical Rupert John G
Publication of WO1990002682A1 publication Critical patent/WO1990002682A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H8/00—Sail or rigging arrangements specially adapted for water sports boards, e.g. for windsurfing or kitesurfing
    • B63H8/20—Rigging arrangements involving masts, e.g. for windsurfing
    • B63H8/22—Rigging arrangements involving masts, e.g. for windsurfing for connecting wishbones to the mast
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H8/00—Sail or rigging arrangements specially adapted for water sports boards, e.g. for windsurfing or kitesurfing
    • B63H8/50—Accessories, e.g. repair kits or kite launching aids
    • B63H8/52—Handheld cleats, cams or hooks for tensioning the downhaul or outhaul of a windsurfing sail

Definitions

  • This invention relates to reefing systems for sailcrafts or sailboards, and especially to reefing systems for sailboards which can be used to greatly vary the lift characteristics of the sail and enable the sailboard to be used safely under a wide variety of wind conditions.
  • This reefing system achieves major reduction in the lift of the sail of a sailboard through severe deformation of the aerodynamic shape of the sail
  • Previous reefing systems for sails have achieved major reductions in lift by reducing the area of the sail.
  • Another previous method involves increasing the outhaul tension on the sail so as to reduce its camber.
  • This invention is a reefing system for a sailboard using a starboard reefing line and a port reefing line to severely deform the aerodynamic shape of the sail to reduce its lift coefficient.
  • This invention increases the safety of the sailboard by making it sailable under changing wind conditions encountered in sudden storms and off shore sailing situations.
  • Fig. 1 shows a side view of a sailboard.
  • Fig. 2 shows a top view of the sail and boom of a sailboard.
  • Fig. 3 shows a preferred embodiement of the sailboard reefing system in an unreefe ⁇ * condition.
  • Fig. 4 shows a preferred embodiement of the sailboard reefing system in a reefed configuration.
  • Fig. 5 shows a preferred location of the sail atiachme ⁇ t mechanism for the reefing system.
  • Fig. 6 shows a preferred location of reefing lines on the sail.
  • Fig. 7 shows the location for multiple attachment mechanisms for the reefing system.
  • Fig. 8 shows a preferred location on the sailboard boom for jamb cleats.
  • Fig. 9 shows a reefing system mounted on the boom with port and starboard jamb cleats, port and starboard reefing lines, and port and starboard sail attachment mechanisms.
  • Fig. 10 shows a sailboard reefing system with port and starboard jamb cleats, port and starboard reefing lines and a single sail attachment mechanism.
  • Figure 1 illustrates a S'de v*ew of a sailboard in accordance with the invention of Schweitzer and Drake (1970); see U.S. Pat. No. 3,487,800.
  • the sailboard consists of a board 11 , a mast 12, a sail 14, and a boom 16 which has a clew end 18 and a spar end 20.
  • Figure 1 also illustrates the opening 22 in the sail sleeve provided in current sail designs to allow for convenient attachment of the boom 16 to the mast 12.
  • Figure 2 illustrates a top view of the sail 14, the mast 12, the boom 16 which has a clew end 18 and a spar end 20, and a typical sail outhaul consisting of two jamb cleats 24 and 26, and outhaul line 29, and a means 28 for attaching the outhaul line 29 to the sail 14.
  • the attachment mechanism 28 is usually a grommet in the sail 14 and often includes some sort of hook, clip, or pulley on the outhaul line 29.
  • the arrow with the symbol W illustrates the wind direction. Since Figure 2 is a top view, the wind direction indicated implies the sailboard is on a port tack. This nomenclature is used in all of the subsequent drawings.
  • FIG 3 illustrates the basic parts of a preferred embodiement of the invention with the sail 14 shown in an unreefed condition.
  • the reefing system consists of a port reefing line 36 attached to the port side of the boom 16 with a jamb cieat 38 and to the sail 14 with an attachment mechanism 34.
  • the port reefing line 36 is loose, allowing the sail 14 to have the same undeformed aerodynamic shape as in Figure 2.
  • the reefing system also has a starboard reefing line 32 attached to the starboard side of the boom 16 with a jamb cleat 30 and to the sail 14 with an attachment mechanism 34.
  • FIG 4 shows the same reefing system as in Figure 3 with the sail 14 in a reefed condition.
  • the port reefing line 36 is tightened causing the sail 14 to have a severely deformed shape which greatly reduces its lift coeficient and makes the sail easy to handle in an extremely heavy wind.
  • the sailor is able to propell the boat forward with a small portion of the sail 14 between the mast 12 and the attachment mechanism 34.
  • the angle between the boom and the wind W is reduced when sailing with the sail 14 in a reefed condition.
  • the upper portion of the sail 14 and the portion of the sail 14 aft of the attachment mechanism 24 is thrown into a luff.
  • the sailor feels a slight vibration in the sail but is able to. sail comfortably in a heavy wind which would otherwise overpower the sailor and leave the sailor stranded.
  • FIG 5 shows a sail 14 with a built in attachment mechanism 34 according to a preferred embodiement of the invention.
  • the attachment mechanism 34 can be a simple grommet.
  • Figure 6 shows a sail 14 in which reefing lines 32 and 36 are directly attached to the sail. Multiple grommets 34 may be provided as shown in Figure 7 when more efficient reefing is desired when the sailor is only slightly overpowered.
  • the desired location for the attachment mechanisms 34 or reefing lines 32 and 36 is generally along and on either side of a line between the opening 22 in the sail for attaching the boom 16 to the to the mast 12 and the clew 40 of the sail 14. This results in the reefing lines being essentially perpendicular to the sail when the reefing lines are pulled tight.
  • a point between 1 and 5 feet aft of the opening 22 in the sail sleeve and between 1 and 5 feet forward of the clew 40 of the sail 14 can provides extremely effective reefing at a point conveniently reached by the sailor while the sailor is sailing the board 11.
  • a point approximately 1 meter aft of the mast 12 on an 8 rrr sail has provided excellent reefing results.
  • FIG 8 shows a preferred embodiement in which the sailboard boom 16 is provided with a port jamb cleat 38 and a starboard jamb cleat 30 for use with a sail which is provided with a port reefing line 32 and a starboard reefing line 36.
  • the jamb cleats 30 and 38 are not essential as the reefing lines 32 and 36 may be simply tied to the boom 16 directly. However, under the adverse heavy wind conditions under which the use of the reefing system is required, jamb cleats 30 and 38 are very desirable since they make it possible to adjust the reefing lines 32 and 26 quickly and easily.
  • FIG. 9 shows a preferred embodiement in which the sailboard boom is provided with port and starboard reefing lines 32 and 36, port and starboard jamb cleats 38 and 30, and port and starboard attachment mechanisms44 and 42.
  • This system has the advantage that the reefing Iines32 and 36 are stowed on the boom 16 so as not to interfere at all with the aerodynamics of the sail 14 when the reefing system is not needed. Also, the sailor can easily attach or disconnect a reefing line to whichever side of the sail 14 happens to be accessible.
  • Figure 10 shows a preferred embodiement similar to the embodiement of Figure 9 in which the port and starboard attachment mechanisms 44 and 42 are attached to each other forming a single attachment mechanism 34 to the sail 14.
  • reefing lines 32 and 36 can be a single continuous line knotted on both sides of a grommet or other attachment mechanism 34 in the sail 14.
  • quick disconnects and jamb cleats can be used as attachment mechanisms 34 to the sail 14 and the boom 16 and means for storing the reefing lines 32 and 36 inside the boom 16 can be devised to completely elliminate any wind resistance or chance of tangling when the reefing system is not in use.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Toys (AREA)

Abstract

A reefing system for a sailboard (11) using a starboard reefing line (32) and a port reefing line (36) to severely deform the aerodynamic shape of the sail to reduce its lift coefficient. This invention increases the safety of the sailboard (11) by making it sailable under changing wind conditions encountered in sudden storms and dangerous offshore sailing situations.

Description

SAILBOARD REEFING SYSTEM
Background - Field of Invention
This invention relates to reefing systems for sailcrafts or sailboards, and especially to reefing systems for sailboards which can be used to greatly vary the lift characteristics of the sail and enable the sailboard to be used safely under a wide variety of wind conditions.
Background - Description of Prior Art
This reefing system achieves major reduction in the lift of the sail of a sailboard through severe deformation of the aerodynamic shape of the sail Previous reefing systems for sails have achieved major reductions in lift by reducing the area of the sail. Another previous method involves increasing the outhaul tension on the sail so as to reduce its camber.
As far as is known, reefing systems using severe deformation of the aerodynamic shape of the sail have not been disclosed or proposed in the art.
Objects and Advantages
Included in the objects and advantages of this invention are to provide a simple reefing system for a sailboard which will enable the sailor to operate under a wide variety of wind conditions without changing sails. Because no effective reefing system exists today for a sailboard, sailors are often stranded when winds suddenly come up or when they sail in an off shore wind and the wind comes up when they sail out of the lee of the shore. Under these conditions, a sailboard sailor can easily be overpowered by the sail and be unable to get back to shore. With this invention, the sailor can effectively can alter the sail in a few seconds with a simple adjustment and make the sail behave as if it were only half as big.
While the primary advantage of this invention is safety under changing and off shore wind conditions, a further advantage is the convenience of altering effective sail area in a few seconds without the inconvenience of changing sails which is usually an arduous task requiring fifteen minutes or more. As a result, sailors are almost always either over powered or underpowered. With this sailboard reefing system, the sail can be tuned to the prevailing wind quickly and easily.
Summary of the Invention
This invention is a reefing system for a sailboard using a starboard reefing line and a port reefing line to severely deform the aerodynamic shape of the sail to reduce its lift coefficient. This invention increases the safety of the sailboard by making it sailable under changing wind conditions encountered in sudden storms and off shore sailing situations.
Further benefits of the invention will become clear from a consideration of the ensuing description and the accompanying drawings.
Drawing Figures:
Fig. 1 shows a side view of a sailboard.
Fig. 2 shows a top view of the sail and boom of a sailboard.
Fig. 3 shows a preferred embodiement of the sailboard reefing system in an unreefeα* condition.
Fig. 4 shows a preferred embodiement of the sailboard reefing system in a reefed configuration.
Fig. 5 shows a preferred location of the sail atiachmeπt mechanism for the reefing system.
Fig. 6 shows a preferred location of reefing lines on the sail.
Fig. 7 shows the location for multiple attachment mechanisms for the reefing system.
Fig. 8 shows a preferred location on the sailboard boom for jamb cleats.
Fig. 9 shows a reefing system mounted on the boom with port and starboard jamb cleats, port and starboard reefing lines, and port and starboard sail attachment mechanisms.
Fig. 10 shows a sailboard reefing system with port and starboard jamb cleats, port and starboard reefing lines and a single sail attachment mechanism.
Drawing Reference Numerals
1 1 Sailboard
12 Mast 14 Sail 16 Boom
18 Clew end of boom
20 Spar end of boom
22 Sleeve opening in sail for boom attachment
24 Jamb cleat for sail out haul
26 Jamb cleat for sail out haul
28 Sail attachment mechanism for outhaul
29 Sail outhaul line
30 Starboard jamb cleat for sailboard reefing line 32 Starboard reefing line
34 Sail attachment mechanism for reefing lines
36 Port reefing line
38 Port jamb cleat for sailboard reefing line
40 Clew of sail
42 Starboard reefing line attachment mechanism
44 Port reefing line attachment mechanism
Description of the Preferred Embodiments Figure 1 illustrates a S'de v*ew of a sailboard in accordance with the invention of Schweitzer and Drake (1970); see U.S. Pat. No. 3,487,800. The sailboard consists of a board 11 , a mast 12, a sail 14, and a boom 16 which has a clew end 18 and a spar end 20. Figure 1 also illustrates the opening 22 in the sail sleeve provided in current sail designs to allow for convenient attachment of the boom 16 to the mast 12. Figure 2 illustrates a top view of the sail 14, the mast 12, the boom 16 which has a clew end 18 and a spar end 20, and a typical sail outhaul consisting of two jamb cleats 24 and 26, and outhaul line 29, and a means 28 for attaching the outhaul line 29 to the sail 14. The attachment mechanism 28 is usually a grommet in the sail 14 and often includes some sort of hook, clip, or pulley on the outhaul line 29. The arrow with the symbol W illustrates the wind direction. Since Figure 2 is a top view, the wind direction indicated implies the sailboard is on a port tack. This nomenclature is used in all of the subsequent drawings.
Figure 3 illustrates the basic parts of a preferred embodiement of the invention with the sail 14 shown in an unreefed condition. The reefing system consists of a port reefing line 36 attached to the port side of the boom 16 with a jamb cieat 38 and to the sail 14 with an attachment mechanism 34. As shown in Figure 3, the port reefing line 36 is loose, allowing the sail 14 to have the same undeformed aerodynamic shape as in Figure 2. The reefing system also has a starboard reefing line 32 attached to the starboard side of the boom 16 with a jamb cleat 30 and to the sail 14 with an attachment mechanism 34.
Figure 4 shows the same reefing system as in Figure 3 with the sail 14 in a reefed condition. In Figure 3, the port reefing line 36 is tightened causing the sail 14 to have a severely deformed shape which greatly reduces its lift coeficient and makes the sail easy to handle in an extremely heavy wind. When the sail 14 is reefed, the sailor is able to propell the boat forward with a small portion of the sail 14 between the mast 12 and the attachment mechanism 34. The angle between the boom and the wind W is reduced when sailing with the sail 14 in a reefed condition. The upper portion of the sail 14 and the portion of the sail 14 aft of the attachment mechanism 24 is thrown into a luff. The sailor feels a slight vibration in the sail but is able to. sail comfortably in a heavy wind which would otherwise overpower the sailor and leave the sailor stranded.
Figure 5 shows a sail 14 with a built in attachment mechanism 34 according to a preferred embodiement of the invention. The attachment mechanism 34 can be a simple grommet. Figure 6 shows a sail 14 in which reefing lines 32 and 36 are directly attached to the sail. Multiple grommets 34 may be provided as shown in Figure 7 when more efficient reefing is desired when the sailor is only slightly overpowered. The desired location for the attachment mechanisms 34 or reefing lines 32 and 36 is generally along and on either side of a line between the opening 22 in the sail for attaching the boom 16 to the to the mast 12 and the clew 40 of the sail 14. This results in the reefing lines being essentially perpendicular to the sail when the reefing lines are pulled tight. Depending on the size of the sail 14, a point between 1 and 5 feet aft of the opening 22 in the sail sleeve and between 1 and 5 feet forward of the clew 40 of the sail 14 can provides extremely effective reefing at a point conveniently reached by the sailor while the sailor is sailing the board 11. As an example, a point approximately 1 meter aft of the mast 12 on an 8 rrr sail has provided excellent reefing results.
Figure 8 shows a preferred embodiement in which the sailboard boom 16 is provided with a port jamb cleat 38 and a starboard jamb cleat 30 for use with a sail which is provided with a port reefing line 32 and a starboard reefing line 36. The jamb cleats 30 and 38 are not essential as the reefing lines 32 and 36 may be simply tied to the boom 16 directly. However, under the adverse heavy wind conditions under which the use of the reefing system is required, jamb cleats 30 and 38 are very desirable since they make it possible to adjust the reefing lines 32 and 26 quickly and easily.
Figure 9 shows a preferred embodiement in which the sailboard boom is provided with port and starboard reefing lines 32 and 36, port and starboard jamb cleats 38 and 30, and port and starboard attachment mechanisms44 and 42. This system has the advantage that the reefing Iines32 and 36 are stowed on the boom 16 so as not to interfere at all with the aerodynamics of the sail 14 when the reefing system is not needed. Also, the sailor can easily attach or disconnect a reefing line to whichever side of the sail 14 happens to be accessible.
Figure 10 shows a preferred embodiement similar to the embodiement of Figure 9 in which the port and starboard attachment mechanisms 44 and 42 are attached to each other forming a single attachment mechanism 34 to the sail 14.
There are many design alternatives for mechanically attaching reefing lines 32 and 36 to a sail 14 or a boom 16. The reefing lines 32 and 36 can be a single continuous line knotted on both sides of a grommet or other attachment mechanism 34 in the sail 14. In general, it will be desirable to make the system in such a way that wind resistance is minimized when the reefing system is not in use. It is especially desirable that the systems be designed to facilitate easy and reliable use under severe weather conditions. Toward this end, quick disconnects and jamb cleats can be used as attachment mechanisms 34 to the sail 14 and the boom 16 and means for storing the reefing lines 32 and 36 inside the boom 16 can be devised to completely elliminate any wind resistance or chance of tangling when the reefing system is not in use.
Sailboard Reefing System - Operation
Operation of the sailboard reefing system follows logically from the functional description given for the system in connection with Figure 3. When the sailor does not require reefing, the reefing lines 32 and 36 are left loose or stowed on or inside the boom 16 or left to hang freely from the sail 14. When the sailor desires to sail on a port tack and requires reefing, the starboard reefing line 32 is first relaxed and the port reefing line 36 is tightened to provide the desired amount of sail deformation. When the sailor desires to sail on the starboard tack, the port reefing line 36 is first relaxed and the starboard reefing line 32 is tightened.
While the above description contains many specificities, the reader should not construe these as limitations on the scope of the invention, but merely as exemplifications of preferred embodiments thereof. Those skilled in the art will envision many other posible variations within its scope. For example skilled artisans will readily be able to change the dimensions and shapes of the various embodiments. They will also be able to make the reefing system of alternative materials which will offer advantages of durabiltiy or cost. They can make many variations in the attachment mechanisms and jamb cleats. In the case of a rigid sail, the use of a conventional flap which is normally used to increase the lift of an airfoil can be used in reverse to reduce the maximum lift coeficient on a given tack. Accordingly, the scope of this invention should be determined by the appended claims and their legal equivalents, and not by the examples which have been given.

Claims

Ciaims: I claim
1. A reefing system for a sailboard having a mast, a sail, and a boom comprising means for severe deformation of the aerodynamic shape so as to reduce the effective lift coefficient of the sail.
2. The reefing system of claim 1 wherein said deformation means consists of starboard and port reefing lines and means for attaching said reefing lines to port and starboard sides of said sail and said boom.
3. The reefing system of claim 2 wherein the means for attaching the reefing lines to the boom consists of jamb cleats which may be attached to the boom at point in between the clew end of said boom and the spar end of said boom.
4. The reefing system of claim 2 wherein said means for attaching said reefing lines to said sail is a grommet which may be installed on said sail at a point between the clew of said sail and the opening opening of said sail for attaching said boom to said mast.
5. The reefing system of claim 2 wherein said means for attaching said reefing lines to said sail is a multiplicity of grommets which may be installed on said sail along and on either side of a line between the clew of said sail and the opening in the sleeve of said sail for attaching said boom to said mast.
6. The reefing system of claim 1 for a sailing craft other than a sailboard.
7. A reefable sail for a sailboard provided with attachment means for port and starboard reefing lines in a region along and on either side of a line between the clew of the sail and the opening in the sail sleeve provided for attaching the mast and the boom.
8. The sail of claim 7 wherein said means for attaching reefing lines is a grommet.
9. The sail of claim 7 wherein said means for attaching reefing lines is a multiplicity of grommets.
10. The sail of claim 7 wherein said means for attaching reefing lines is a permanent attachment of the said reefing lines to said sail. WO 90/02682
11. A ooom for a sailboard provided with means for attaching reefing lines at a point between the clew end of said boom and the spar end of the said boom.
12. The boom of claim 11 wherein said means for attaching reefing lines is jamb cleats attached to port and starboard sides of said boom at a point between the spar end of said boom and the clew end of said boom.
13. The boom of claim 11 wherein said means for attaching reefing lines is a multiplicity of jamb cleats attached to port and starboard sides of said boom at a multiplicity of points between the spar end of said boom and the clew end of said boom.
PCT/US1989/003812 1988-09-01 1989-09-01 Sailboard reefing system WO1990002682A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23979588A 1988-09-01 1988-09-01
US239,795 1988-09-01

Publications (1)

Publication Number Publication Date
WO1990002682A1 true WO1990002682A1 (en) 1990-03-22

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ID=22903778

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1989/003812 WO1990002682A1 (en) 1988-09-01 1989-09-01 Sailboard reefing system

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AU (1) AU4208789A (en)
WO (1) WO1990002682A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2422551A1 (en) * 1978-04-12 1979-11-09 Rech Produits Et Area adjusting system for triangular sail - has sail unfurled to suit one of three anchorage points at each corner of sail
FR2493797A1 (en) * 1980-11-10 1982-05-14 Deme Expl Voilerie Reefable sail for wind-surfing board - attaches to mast via luff sleeve with two alternative lashing eyelets in both clew and tack zones
NL8006046A (en) * 1980-11-05 1982-06-01 Derk Frans Thijs SAIL FOR A VEHICLE OR VESSEL.
NL8101805A (en) * 1981-04-13 1982-11-01 Bernard Leendert Erlo Van Wave SAILBOARD, PARTICULARLY WITH REEF AND TRIMMABLE RIG.
EP0071253A1 (en) * 1981-07-30 1983-02-09 Lothar Brittinger Rigging and sail for a wind-surf board
EP0139782A1 (en) * 1983-10-29 1985-05-08 Partanag AG Change of the area of the sail of a sailing-device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2422551A1 (en) * 1978-04-12 1979-11-09 Rech Produits Et Area adjusting system for triangular sail - has sail unfurled to suit one of three anchorage points at each corner of sail
NL8006046A (en) * 1980-11-05 1982-06-01 Derk Frans Thijs SAIL FOR A VEHICLE OR VESSEL.
FR2493797A1 (en) * 1980-11-10 1982-05-14 Deme Expl Voilerie Reefable sail for wind-surfing board - attaches to mast via luff sleeve with two alternative lashing eyelets in both clew and tack zones
NL8101805A (en) * 1981-04-13 1982-11-01 Bernard Leendert Erlo Van Wave SAILBOARD, PARTICULARLY WITH REEF AND TRIMMABLE RIG.
EP0071253A1 (en) * 1981-07-30 1983-02-09 Lothar Brittinger Rigging and sail for a wind-surf board
EP0139782A1 (en) * 1983-10-29 1985-05-08 Partanag AG Change of the area of the sail of a sailing-device

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Publication number Publication date
AU4208789A (en) 1990-04-02

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