EP0353901B1 - Anordnungen für Katamaran mit Segeln - Google Patents

Anordnungen für Katamaran mit Segeln Download PDF

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Publication number
EP0353901B1
EP0353901B1 EP19890307251 EP89307251A EP0353901B1 EP 0353901 B1 EP0353901 B1 EP 0353901B1 EP 19890307251 EP19890307251 EP 19890307251 EP 89307251 A EP89307251 A EP 89307251A EP 0353901 B1 EP0353901 B1 EP 0353901B1
Authority
EP
European Patent Office
Prior art keywords
support frame
catamaran
hulls
rudder
mast
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 - Lifetime
Application number
EP19890307251
Other languages
English (en)
French (fr)
Other versions
EP0353901A1 (de
Inventor
Anthony Richard Wood Rogers
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0353901A1 publication Critical patent/EP0353901A1/de
Application granted granted Critical
Publication of EP0353901B1 publication Critical patent/EP0353901B1/de
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/16—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces
    • B63B1/18—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydroplane type
    • B63B1/20—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydroplane type having more than one planing surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/12—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
    • B63B1/121—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising two hulls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/02—Hulls assembled from prefabricated sub-units
    • B63B3/08—Hulls assembled from prefabricated sub-units with detachably-connected sub-units
    • B63B2003/085—Multiple hull vessels, e.g. catamarans, assembled from detachably-connected sub-units

Definitions

  • Standard catamaran designs provided with planing hulls are known, for example, from the Patent Specifications of U.S. Patent No. 2712293 and French Patent No. 2588216.
  • catamaran designs incorporate either a central keel member or possibly individual keel members under each of the hulls.
  • a sailing catamaran comprising a support frame having forward and rearward ends and two sides, a pair of planing hulls formed with substantially vertical side faces along at least part of their length interconnected by the support frame along the two sides of the support frame, the catamaran having a centre-line equidistant between the two hulls, a mast with a sail, a mast base mounting positioned on said centreline towards the forward end of the support frame and forming part of the support frame, characterised in that a rudder and a keel member linked together to form a skeg-rudder is mounted towards the rearward end of the support frame and positioned along the centreline.
  • the necessary side force is generated, partly by the vertical side faces of the planing hulls, but more importantly by the deeply immersed skeg-rudder positioned centrally and at the rear of the catamaran structure.
  • the provision of the keel at the rear of the craft as part of the skeg-rudder creates significant handling advantages and capabilities as compared with a design where a keel member is provided separately at the centre of a catamaran structure.
  • the overall combination of the invention provides excellent speed characteristics and also enables the mast to be set well back from the forward end of the catamaran so that it is less liable to tip over in a forward direction during sailing.
  • Speed is achieved by utilising planing hulls which do not themselves incorporate any form of standard keel or dagger plate. It may be preferred that only the rear portions of the planing hulls should be formed with substantially vertical side faces which will provide significant resistance to sideways thrusts whilst the catamaran is being sailed. This assists in the control of the direction of the catamaran during sailing, in combination with the skeg-rudder.
  • the skeg-rudder should be pivotally mounted on the support frame so that it can be pivoted into a condition wherein parts thereof do not project below the plane occupied by the bases of the two hulls. This allows the catamaran to be sailed to shore through shallow waters.
  • the support frame is ideally constructed as an assembly which can be disconnected from the hulls and broken down into individual parts. This enables the catamaran to be transported easily, for example on a car roof rack.
  • the sailing catamaran shown in the drawings comprises a pair of planing hulls 1 held together by a support frame 2 which incorporates a mounting 3 for a mast 4 carrying a sail 5 and a wishbone boom 6.
  • a skeg rudder 7 Centrally of the rear strut of the frame 2 there is mounted a skeg rudder 7.
  • this skeg rudder comprises a skeg 8, at the rear end of which is pivotally mounted on rudder 9.
  • a support member 10 attached to the skeg 8 is mounted in a bracket 11 by means of a pivot pin 12.
  • a locking pin 13 restrains the skeg rudder against pivoting during normal sailing use but with the locking pin 13 removed, the skeg rudder can tilt backwards so that the normal forward edge 20 will be generally parallel with the plane of the bases of the two hulls 1.
  • Each planing hull has a generally flat lower surface and Figure 4 illustrates the change in section along the length of the planing hull (from front to rear) at the points marked 1 to 7.
  • the rear portion of each planing hull has substantially vertical side faces which therefore provide resistance to sideways motion (in combination with that provided by the skeg rudder 7) towards the rear only of the catamaran.
  • the support frame 2 is constructed from a number of struts 14 interconnected by socket joints 15. Legs 16 terminate in tubular feet 17 which are vertically disposed and will be mounted within sockets 18 in the planing hulls 2. A trampoline 19 is supported by the struts 14. This support frame can readily be dismantled for storage purposes.
  • the frame is equally suitable for rigging with a conventional mast and stays.
  • planing hulls allow a short catamaran to exceed the established performance/length criteria which limit conventional displacement catamarans.
  • Planing hulls have inherently less lateral force generation capability than displacement forms. This fact is used to advantage by concentrating the keel force at the rear of the craft. This rearward keel force allows a more rearward mast position and rearward raking of the mast. Both of these reduce the diagonally forward roll-over moment which limits the performance of conventional catamarans; indeed the mast rake also provides a lift element which enhances planing performance. Keels are more efficient at generating side force than hulls.
  • the novel frame design allows a single centrally mounted keel in the form of a skeg rudder. Since this is designed to be a unit functioning in the same way as a flapped aerofoil, very high lift (keel force) forces can be generated at excellent efficiencies.
  • the design of the skeg rudder is important and in general is most efficient when the chord (width) of the skeg is less than 25% of the chord of the rudder.
  • the shallow draft of the planing hulls combined with the pivoting of the skeg rudder allows the craft to be sailed in very shallow water (less than 1 ft. deep).
  • the hulls are most efficient if the sidewalls are vertical throughout and this feature can be utilised provided it is combined with suitable plan and profile shapes, hull characteristics can be achieved whereby a limited amount of sidethrust (keel effect) is provided by the hulls which aids stability at speed and in particular provides a force which tends to turn the craft into the wind if excessive angles of 'heel' are reached.
  • This limited sidethrust is much less than that provided by conventional deep 'V' catamaran hulls and always works in conjunction with the skeg-rudder.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Body Structure For Vehicles (AREA)

Claims (5)

  1. Segel-Katamaran mit einem Tragrahmen (2) mit einem vorderen und einem rückwärtigen Ende und zwei Seiten, zwei Gleitflächenrümpfen (1) mit im wesentlichen senkrechten Seitenflächen entlang mindestens einem Teil ihrer Länge, die durch den Tragrahmen entlang dessen beiden Seiten verbunden sind, wobei der Katamaran eine äquidistante Mittellinie zwischen den beiden Rümpfen, einen Mast (4) mit einem Segel (5) sowie eine Masthalterung (3) aufweist, die auf der Mittellinie zum vorderen Ende des Tragrahmens (2) hin angeordnet ist, dadurch gekennzeichnet, daß ein Ruder (9) und ein Kielglied (8) miteinander zu einem Skeg-Ruder (7) verbunden sind, das zum rückwärtigen Ende des Tragrahmens hin angeordnet und entlang der Mittellinie positioniert sind.
  2. Katamaran nach Anspruch 1, dadurch gekennzeichnet, daß nur die rückwärtigen Abschnitte der Rümpfe (1) mit im wesentlichen senkrechten Seitenflächen geformt sind.
  3. Katamaran nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Skeg-Ruder (7) schwenkbar am Tragrahmen (2) angebracht ist zwecks Verschwenkung in eine Lage, in welcher kein Teil desselben von der Ebene vorsteht, in der die Böden der beiden Rümpfe (1) liegen.
  4. Katamaran nach einem der Ansprüche 1 bis 3,, dadurch gekennzeichnet, daß der Mast (4) ohne Stage ist und daß ein Gabelbaum (6) am Mast und am Segel (5) befestigt ist.
  5. Katamaran nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Tragrahmen (2) als in einen kompakten Zustand zerlegbare Einheit ausgebildet ist.
EP19890307251 1988-07-19 1989-07-18 Anordnungen für Katamaran mit Segeln Expired - Lifetime EP0353901B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888817184A GB8817184D0 (en) 1988-07-19 1988-07-19 Improvements relating to sailing catamarans
GB8817184 1988-07-19

Publications (2)

Publication Number Publication Date
EP0353901A1 EP0353901A1 (de) 1990-02-07
EP0353901B1 true EP0353901B1 (de) 1993-10-20

Family

ID=10640732

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890307251 Expired - Lifetime EP0353901B1 (de) 1988-07-19 1989-07-18 Anordnungen für Katamaran mit Segeln

Country Status (3)

Country Link
EP (1) EP0353901B1 (de)
DE (1) DE68910039D1 (de)
GB (1) GB8817184D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112009627A (zh) * 2020-08-25 2020-12-01 三峡大学 一种双体结构的采莲游船及使用方法

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5120249A (en) * 1991-08-06 1992-06-09 Fonda Jacob H Combination catamaran boat and cross water ski system
GB9413017D0 (en) * 1994-06-29 1994-08-17 Silky Ltd Boat
US5520130A (en) * 1994-09-12 1996-05-28 Upchurch; David P. Boat having hull members with separate fore and aft planing surfaces
US6119284A (en) * 1999-04-29 2000-09-19 Cosman; Derek Floating pool cover support
ITUB20152382A1 (it) * 2015-07-22 2017-01-22 Nino Venturini Catamarano.
CN107878670B (zh) * 2017-11-14 2023-09-26 华南理工大学 小回转半径箱式连接桥远距离海水采样太阳能双体无人船
EP3725666A1 (de) * 2019-04-14 2020-10-21 Resorts Srl Katamaran
CN112389580B (zh) * 2020-10-28 2023-03-31 格力休闲体育用品有限公司 充气式双体帆船

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712293A (en) * 1954-06-02 1955-07-05 O'higgins Michael Knock down catamaran unit
DK292082A (da) * 1982-06-29 1983-12-30 Jens Peter Jensen Stativ til aftagelig forbindelse med i det mindste et surfbraedt
FR2579953A1 (en) * 1985-04-09 1986-10-10 Brun Pierre Inshore craft of the catamaran type which can be rapidly dismantled
FR2588216A1 (fr) * 1985-10-07 1987-04-10 Chauveau Jean Claude Nacelle utilisee comme element de base pour un engin de deplacement, pouvant etre associee a d'autres elements, permettant quatre modes de deplacement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112009627A (zh) * 2020-08-25 2020-12-01 三峡大学 一种双体结构的采莲游船及使用方法

Also Published As

Publication number Publication date
GB8817184D0 (en) 1988-08-24
EP0353901A1 (de) 1990-02-07
DE68910039D1 (de) 1993-11-25

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