EP0102624A2 - Mâture pour planches à voile - Google Patents

Mâture pour planches à voile Download PDF

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Publication number
EP0102624A2
EP0102624A2 EP83108614A EP83108614A EP0102624A2 EP 0102624 A2 EP0102624 A2 EP 0102624A2 EP 83108614 A EP83108614 A EP 83108614A EP 83108614 A EP83108614 A EP 83108614A EP 0102624 A2 EP0102624 A2 EP 0102624A2
Authority
EP
European Patent Office
Prior art keywords
sail
mast
boom
slot
rig according
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.)
Withdrawn
Application number
EP83108614A
Other languages
German (de)
English (en)
Other versions
EP0102624A3 (fr
Inventor
Horst Rathert
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.)
Shark Wassersportgerate GmbH
Original Assignee
Shark Wassersportgerate GmbH
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 Shark Wassersportgerate GmbH filed Critical Shark Wassersportgerate GmbH
Publication of EP0102624A2 publication Critical patent/EP0102624A2/fr
Publication of EP0102624A3 publication Critical patent/EP0102624A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • B63H8/40—Arrangements for improving or maintaining the aerodynamic profile of sails, e.g. cambers, battens or foil profiles

Definitions

  • the invention relates to a rig for a sail board, with an unstuck mast that can be freely rotated and swiveled on all sides, with a boom attached to the mast and with a sail held open between the mast and boom.
  • the aerodynamically most favorable course of the sail profile changes with increasing dynamic pressure on the sail, since the mast and boom are subject to bending stress.
  • the mast itself forms an interference point for the suction side flow at the front edge of the sail, the boundary layer of which changes from the laminar to the turbulent state at an early stage and thus tends to detach.
  • the detachment process takes place on the suction side of the sail at about half the profile length, namely when there is a noticeable delay in the higher suction side speed. The force effect is consequently reduced since the deflection is no longer complete.
  • the flow can also be interrupted directly on the mast, the suction side flow then no longer has any share in the resulting buoyancy.
  • the angle of attack of the sail against the wind direction should be kept small, which, however, leads to a low lift coefficient and thus to a low propulsive force of the sail.
  • the force effect is reduced again by the stall occurring.
  • the invention has for its object to provide a rig of the type mentioned, which has better aerodynamic properties with a structurally simple construction and inexpensive manufacture, but does not affect handling. Another object is to improve the rig of the type mentioned at the outset in such a way that a reduced force requirement when catching up with the sail is required.
  • the sail surface above the boom is opened by a slot running from top to bottom and the aft part of the front surface is bulged in relation to the luff of the rear surface and is self-turning to the luff of the rear surface.
  • Advantageous embodiments of the sail according to the invention are characterized in the subclaims.
  • the flow properties can be significantly improved.
  • the flow can attach itself to the still energetic flow between the front surface and the rear surface and then continues with it from the rear surface redirected.
  • the profile length of the rear surface is again only small, so that there is no detachment here either.
  • the rear surface has a taut luff without a thickening which interferes with the flow, as represented, for example, by the mast. Preventing the flow separation allows a larger angle of attack and thus a larger maximum lift coefficient.
  • the induced resistance which arises from the edge vortices when the ends flow from the pressure side to the vacuum side, becomes smaller because the ratio of the span to the profile length of the individual partial areas is larger and therefore better. For this reason, the lift gradient also increases. H. the increase in lift when the angle of attack is increased.
  • the sail propulsion is not only increased by the maximum possible angle of attack, but also by the steeper increase in lift. This is particularly important if the sail is inclined towards windward in strong winds and the current along the sail has a downward component.
  • the ratio of the span to the profile length changes because the span is smaller and the profile length is longer compared to the direction of flow. By dividing the sail, this small, unfavorable ratio is doubled and the marginal vertebrae are thus considerably reduced.
  • FIGS. 1 and 2 illustrates a rig with a mast 2 and a sail 1, the surface of which above a boom 3 is opened by a slot la running obliquely to the rear from the mast top to the boom.
  • the position of the slot in the sail was chosen such that sail cuts "Z" lying at right angles to the mast are divided in a ratio of 40:60.
  • the aft part of the front sail area is bulged and self-turning for the luff of the rear sail area.
  • the slot la can be divided several times over its length, which results in several pocket-like bulges in the aft part of the front sail area, which are each self-turning towards the luff of the associated rear sail area.
  • the subdivision can be designed to be detachable.
  • the slot la runs in a straight line in the sail area, but it can also be guided in an arc from top to bottom.
  • a plurality of slits arranged in the form of a beam can be provided, these slits then preferably being divided into equal partial lengths at right angles to the mast.
  • the sail area below the boom can additionally be opened by one or more slots which run approximately upwards and backwards in the area of the mast foot, in the same division as in the upper sail area.
  • the aft part of the respective front sail area is again bulged and self-turning towards the luff of the respective rear sail area.
  • the aerodynamic properties can be opened by opening the sail area in Ver binding with the bulbous design of the front sail area, which is self-turning for luffing the rear sail area, can be significantly improved. No additional constructive measures or aids are required, the sail can be kept in its original cut.
  • v The direction of flow with the mast standing vertically is marked with v, while v 'shows the downward component with the mast inclined towards the windward, b and t are the span and profile length of the overall sail in the vertical position and b' and t 'represent the span in the inclined position recognizes how the slope reduces the ratio b to t to b 'to t'.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Jib Cranes (AREA)
  • Wind Motors (AREA)
EP83108614A 1982-09-04 1983-09-01 Mâture pour planches à voile Withdrawn EP0102624A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823232976 DE3232976A1 (de) 1982-09-04 1982-09-04 Rigg fuer segelbrett
DE3232976 1982-09-04

Publications (2)

Publication Number Publication Date
EP0102624A2 true EP0102624A2 (fr) 1984-03-14
EP0102624A3 EP0102624A3 (fr) 1984-12-19

Family

ID=6172512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83108614A Withdrawn EP0102624A3 (fr) 1982-09-04 1983-09-01 Mâture pour planches à voile

Country Status (2)

Country Link
EP (1) EP0102624A3 (fr)
DE (1) DE3232976A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988004632A1 (fr) * 1986-12-19 1988-06-30 Hannes Marker Voile maintenue entre un mat et une grande bome ou bome fourchue
FR2622530A1 (fr) * 1987-10-31 1989-05-05 Farrar Austin Voile a fente verticale pour embarcation a voile
DE3921606A1 (de) * 1989-06-30 1991-01-03 Erhard Prof Hoessle Surf-, drachensegel oder dergleichen
GB2389567A (en) * 2002-06-10 2003-12-17 Simon Benton Spinnaker having slots parallel to each side edge
WO2010034839A2 (fr) * 2008-09-26 2010-04-01 Creaidea Voile

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT693829A (fr) *

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT693829A (fr) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988004632A1 (fr) * 1986-12-19 1988-06-30 Hannes Marker Voile maintenue entre un mat et une grande bome ou bome fourchue
FR2622530A1 (fr) * 1987-10-31 1989-05-05 Farrar Austin Voile a fente verticale pour embarcation a voile
GB2211805A (en) * 1987-10-31 1989-07-12 Austin Packard Farrar A sail for a sailing craft
DE3921606A1 (de) * 1989-06-30 1991-01-03 Erhard Prof Hoessle Surf-, drachensegel oder dergleichen
GB2389567A (en) * 2002-06-10 2003-12-17 Simon Benton Spinnaker having slots parallel to each side edge
WO2010034839A2 (fr) * 2008-09-26 2010-04-01 Creaidea Voile
WO2010034839A3 (fr) * 2008-09-26 2010-07-29 Creaidea Voile

Also Published As

Publication number Publication date
DE3232976A1 (de) 1984-03-08
EP0102624A3 (fr) 1984-12-19

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT CH DE FR GB LI NL

PUAL Search report despatched

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18D Application deemed to be withdrawn

Effective date: 19850819

RIN1 Information on inventor provided before grant (corrected)

Inventor name: RATHERT, HORST