EP0353901A1 - Dispositif pour engin de navigation du type catamaran - Google Patents

Dispositif pour engin de navigation du type catamaran Download PDF

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Publication number
EP0353901A1
EP0353901A1 EP89307251A EP89307251A EP0353901A1 EP 0353901 A1 EP0353901 A1 EP 0353901A1 EP 89307251 A EP89307251 A EP 89307251A EP 89307251 A EP89307251 A EP 89307251A EP 0353901 A1 EP0353901 A1 EP 0353901A1
Authority
EP
European Patent Office
Prior art keywords
rudder
keel
support frame
catamaran
hulls
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.)
Granted
Application number
EP89307251A
Other languages
German (de)
English (en)
Other versions
EP0353901B1 (fr
Inventor
Anthony Richard Wood Rogers
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0353901A1 publication Critical patent/EP0353901A1/fr
Application granted granted Critical
Publication of EP0353901B1 publication Critical patent/EP0353901B1/fr
Anticipated expiration legal-status Critical
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

  • a sailing catamaran comprising a pair of planing hulls interconnected by a support frame which supports the mast and sail, a rudder and a keel member both mounted on the support frame rearwardly of the mast base mounting, with the keel towards the rear of the support frame, and both positioned along the centreline between the two hulls.
  • the novel combination of planing hulls with a rear­wardly mounted keel and the rudder and keel positioned along the centreline 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.
  • the keel could be separate from the rudder, poss­ibly with the rudder mounted closely behind the mast base mounting. Ideally however the keel and rudder will be mounted close together towards the rear of the support frame.
  • the preferred arrangement has the keel and rudder in the form of a skeg rudder.
  • 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 thrust whilst the catamaran is being sailed. This assists in the control of the direction of the catamaran during sailing, in combination with the rudder and keel.
  • the rudder and the keel should be pivotally mounted on the support frame so that they can be pivoted into a condition where the normally forward edges thereof lie substantially in the same plane as 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 com strictlyprises 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. Cen­trally of the rear strut of the frame 2 there is mounted a skeg rudder 7. As shown in Figure 6 in particular, 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).
  • An alternative to the skeg-rudder is to replace it with a single pivoting keel mounted in the same rear beam position and provide a single pivoting central forward rudder mounted from the front beam behind the mast support box.
  • 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)
  • Body Structure For Vehicles (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
EP19890307251 1988-07-19 1989-07-18 Dispositif pour engin de navigation du type catamaran Expired - Lifetime EP0353901B1 (fr)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=10640732

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890307251 Expired - Lifetime EP0353901B1 (fr) 1988-07-19 1989-07-18 Dispositif pour engin de navigation du type catamaran

Country Status (3)

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

Cited By (7)

* 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
WO1996000680A1 (fr) * 1994-06-29 1996-01-11 Silky Limited Catamaran
WO1996008406A1 (fr) * 1994-09-12 1996-03-21 Upchurch David P Bateau comportant des elements de coque avec des surfaces de glissement avant et arriere distinctes
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.
CN107878670A (zh) * 2017-11-14 2018-04-06 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
CN112389580A (zh) * 2020-10-28 2021-02-23 格力休闲体育用品有限公司 充气式双体帆船

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112009627B (zh) * 2020-08-25 2022-04-22 三峡大学 一种双体结构的采莲游船及使用方法

Citations (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
WO1984000134A1 (fr) * 1982-06-29 1984-01-19 Jens Peter Jensen Structure porte-bagages pour montage sur au moins un element flotteur, en particulier sur une planche de surf
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

Patent Citations (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
WO1984000134A1 (fr) * 1982-06-29 1984-01-19 Jens Peter Jensen Structure porte-bagages pour montage sur au moins un element flotteur, en particulier sur une planche de surf
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 (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
WO1996000680A1 (fr) * 1994-06-29 1996-01-11 Silky Limited Catamaran
WO1996008406A1 (fr) * 1994-09-12 1996-03-21 Upchurch David P Bateau comportant des elements de coque avec des surfaces de glissement avant et arriere distinctes
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.
CN107878670A (zh) * 2017-11-14 2018-04-06 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
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
CN112389580A (zh) * 2020-10-28 2021-02-23 格力休闲体育用品有限公司 充气式双体帆船

Also Published As

Publication number Publication date
GB8817184D0 (en) 1988-08-24
DE68910039D1 (de) 1993-11-25
EP0353901B1 (fr) 1993-10-20

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