EP0005343B1 - A wind-propelled vehicle - Google Patents

A wind-propelled vehicle Download PDF

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Publication number
EP0005343B1
EP0005343B1 EP79300690A EP79300690A EP0005343B1 EP 0005343 B1 EP0005343 B1 EP 0005343B1 EP 79300690 A EP79300690 A EP 79300690A EP 79300690 A EP79300690 A EP 79300690A EP 0005343 B1 EP0005343 B1 EP 0005343B1
Authority
EP
European Patent Office
Prior art keywords
mast
wind
boom assembly
sail
hull
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
EP79300690A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0005343A3 (en
EP0005343A2 (en
Inventor
Amiram Steinberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0005343A2 publication Critical patent/EP0005343A2/en
Publication of EP0005343A3 publication Critical patent/EP0005343A3/xx
Application granted granted Critical
Publication of EP0005343B1 publication Critical patent/EP0005343B1/en
Expired legal-status Critical Current

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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
    • B63H8/24—Arrangements for connecting the rigging to a board

Definitions

  • the present invention concerns wind-propelled vehicles comprising a sail mounted on an unstayed mast and in which essentially all the steering and control is accomplished through the sail.
  • a sail mounted on an unstayed mast and in which essentially all the steering and control is accomplished through the sail.
  • One kind of vehicle to which the invention pertains is surfboards and the invention will hereinafter be described with reference thereto, it being understood that it is not confined to surfboards and is also applicable to other wind propelled vehicles such as, for example, iceboats and sleds.
  • the sail For example, if the craft is sailing with the wind abeam and the user wishes to steer leeward, the sail must be tilted forwardly and downwardly from its balanced position whereby a steering moment of the wind is applied to the surfboard which causes the craft to turn. If the user wants, on the other hand, to steer to windward, the sail is tilted backwards from its balanced position. In the known surfboards said tilting, and in particular the forward tilt, reduces the aerodynamic efficiency of the sail.
  • the invention provides a wind-propelled vehicle comprising an unstayed mast (5) connected to a hull (2) through a joint (7, 8, 10) which will provide universal type movement of the mast (5), a boom assembly attached to the mast (5) and consisting of two booms (15, 16) joined to each other at their free ends, and a sail (25) carried by the mast (5) and the boom assembly (15, 16), characterised in that the mast (5) has a longitudinally curved form, the boom assembly (15, 16) is substantially rigid, and the connection (19, 20, 21, 22) between the mast (5) and the boom assembly (15, 16) is such that no relative angular displacement is possible between them around an axis defined by the centre line of the mast (5) at the point of the connection.
  • masts are as a rule straight, possibly short of a small uppermost stretch.
  • a sailing craft known by the name of Jangada which is a raft made of logs of light wood with a sail, seat, steering oar and daggerboards (see, for example, Websters 3rd International Dictionary, page 1209).
  • This raft which is steerable in the normal way, which has no booms and in which the mast is rigidly connected to the raft, represents a different art than the present invention.
  • the wind-propelled vehicle according to the invention is a surfboard.
  • the hull of such surfboard comprises at least one leeboard.
  • the surfboard 1 according to the invention here illustrated comprises a hull 2 fitted with a central leeboard 3 and a stern leeboard 4.
  • a curved tubular mast 5, e.g., of aluminium, is joined to the hull 2 in such a way as to enable universal-type movement. This joint is shown more specifically in Fig. 5.
  • a flexible, cylindrical rod 6, e.g. of rubber, having a broadened lower tip 7 is received by a correspondingly shaped recess 8 of the hull.
  • the lower hollow conical portion 9 of the mast 5 receives the upper end of the flexible rod 6 and is connected thereto by a connecting pin 10, which in turn is secured by a cotter pin 11.
  • the rigging of the craft further comprises a boom assembly comprising booms 15 and 16 joined together at both the mast and clew ends to form an oblong, basically rigid annular body having at the mast end a fulcrum 28.
  • the connection between the mast end of this assembly and the mast is shown in Fig. 4.
  • the boom assembly 15, 16 which is located in a plane P 2 (see Fig. 1) comprises near the mast end two identical brackets 17 and 18 with integral pins 19 and 20, respectively, symmetrically positioned with respect to the central line of the boom assembly.
  • Mast 5 comprises securely mounted onto opposite sides thereof two identical, slotted suspending members 21 and 22 whose slots are adapted to receive pins 19 and 20, respectively, the slotted suspending members slid onto the pins from above. Stops are provided (not shown) to prevent the pins 19, 20 from sliding out of the slots.
  • a sail 25 is mounted on mast 5 by means of a suitably shaped hem of the sail which receives the mast.
  • the clew of sail 25 is connected to booms 15 and 16 by means of outhauls 26, 27 which engage the booms in any suitable way known in the art, e.g. by means of cleats.
  • the luff, clew and chord of sail 25 are all located in a plane P, forming a right angle with plane P 2 of the boom assembly.
  • connection between the mast and the boom assembly enables a certain up and down leverage of the boom with respect to the mast around pins 19 and 20 which serve as pivots.
  • the boom assembly 15, 16 is rigid no part of it can move out of plane P and when the boom assembly is levered up or down plane P 2 follows suit so that the assembly always remains in the plane. In consequence the leeward boom 16 does at no time interfere with an efficient aerodynamic profile of the sail 25.
  • the prior art surfboard 101 of Fig. 3 is essentially of the kind described in U.S. patent specification 3,487,800. It comprises a hull 102, a straight mast 105 connected to the hull by a joint which provides universal-type movement, a sail 125 and a pair of curved booms 115, 116 interconnected at both ends.
  • the connection between the booms and the mast is such as to enable a relative angular displacement around an upright axis extending through the connection.
  • the booms do not form together a rigid annular assembly.
  • Figs. 1 and 2 the position of the rigging is the same. In that position the wind W forms an angle a with the central line B of the boom assembly and fulcrum 28 has moved windward with respect to the central line A of the hull. At the same time an angle f3 is formed between the central line A of the hull and the projection of the central line B of the boom assembly onto the hull surface. In that position the user may still conveniently stand on the hull 2 without need for any undue twist of the body. It can further be seen from Figs. 1 and 2 that in the two operational positions shown the shoulder line of the user will form an angle of about 45° with the central line A of the craft and consequently he needs to turn his head only by about 45° to face the stem. This contributes to the comfort of operation as compared to the known surfboards.
  • fulcrum 128 is more leeward which compels the user to pull the entire rigging system back to windward. Due to this and also due to the degree of freedom between the mast and the booms and further due to the bending and twisting of the booms relative to each other the user is compelled to twist his body in an awkward position. Furthermore in that craft the shoulder line of the user will be approximately parallel to the central line of the craft which adds to the user's discomfort.
  • the boom assembly 15, 16 is so manipulated that the mast is tilted forward or backward, as this may be required. Due to the curved shape of the mast such tilting does not adversely affect the aerodynamic properties of the sail.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Wind Motors (AREA)
  • Toys (AREA)
EP79300690A 1978-05-03 1979-04-24 A wind-propelled vehicle Expired EP0005343B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL54633A IL54633A (en) 1978-05-03 1978-05-03 Wind-propelled vehicle
IL54633 1978-05-03

Publications (3)

Publication Number Publication Date
EP0005343A2 EP0005343A2 (en) 1979-11-14
EP0005343A3 EP0005343A3 (en) 1979-11-28
EP0005343B1 true EP0005343B1 (en) 1982-03-31

Family

ID=11050268

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79300690A Expired EP0005343B1 (en) 1978-05-03 1979-04-24 A wind-propelled vehicle

Country Status (4)

Country Link
EP (1) EP0005343B1 (xx)
AU (1) AU523541B2 (xx)
DE (1) DE2962381D1 (xx)
IL (1) IL54633A (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3427753A1 (de) * 1984-03-30 1985-10-10 Dieter 8242 Bischofswiesen Frank Rigg fuer ein surfbrett

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2179904B (en) * 1985-09-06 1990-07-11 Adrenalin Co Ltd A sailing craft
DE8709564U1 (de) * 1987-07-11 1987-09-17 Schütz-Werke GmbH & Co KG, 5418 Selters Gabelbaumbefestigung für Surfsegelbretter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7630035U1 (xx) * Kolbus Kunststoffwerk & Co, 2830 Bassum
DE7531883U (de) * 1975-10-07 1978-04-06 Kador, Ulrich, Dr., 8130 Starnberg Rigg für ein Segelbrett
US4077315A (en) * 1976-07-02 1978-03-07 Deere & Company Cylindrical baler conveyor
DE2701243A1 (de) * 1977-01-13 1978-07-20 Mistral Windsurfing Ag Segel-trimmeinrichtung fuer spreizgaffeltakelung, insbesondere fuer surfsegelbretter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3427753A1 (de) * 1984-03-30 1985-10-10 Dieter 8242 Bischofswiesen Frank Rigg fuer ein surfbrett

Also Published As

Publication number Publication date
IL54633A0 (en) 1978-07-31
IL54633A (en) 1979-11-30
EP0005343A3 (en) 1979-11-28
AU4655279A (en) 1979-11-29
EP0005343A2 (en) 1979-11-14
AU523541B2 (en) 1982-08-05
DE2962381D1 (en) 1982-05-06

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