WO2004043775A1 - Flexible keel and fitting therefor - Google Patents
Flexible keel and fitting therefor Download PDFInfo
- Publication number
- WO2004043775A1 WO2004043775A1 PCT/GB2003/004918 GB0304918W WO2004043775A1 WO 2004043775 A1 WO2004043775 A1 WO 2004043775A1 GB 0304918 W GB0304918 W GB 0304918W WO 2004043775 A1 WO2004043775 A1 WO 2004043775A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- water craft
- elongate member
- hull
- keel
- formation
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60F—VEHICLES FOR USE BOTH ON RAIL AND ON ROAD; AMPHIBIOUS OR LIKE VEHICLES; CONVERTIBLE VEHICLES
- B60F3/00—Amphibious vehicles, i.e. vehicles capable of travelling both on land and on water; Land vehicles capable of travelling under water
- B60F3/003—Parts or details of the vehicle structure; vehicle arrangements not otherwise provided for
- B60F3/0038—Flotation, updrift or stability devices
-
- 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
- B63B3/14—Hull parts
- B63B3/38—Keels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B34/00—Vessels specially adapted for water sports or leisure; Body-supporting devices specially adapted for water sports or leisure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B41/00—Drop keels, e.g. centre boards or side boards ; Collapsible keels, or the like, e.g. telescopically; Longitudinally split hinged keels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
- B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
- B63B2039/063—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water the foils comprising flexible portions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B2231/00—Material used for some parts or elements, or for particular purposes
- B63B2231/40—Synthetic materials
- B63B2231/42—Elastomeric materials
- B63B2231/44—Rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B32/00—Water sports boards; Accessories therefor
- B63B32/60—Board appendages, e.g. fins, hydrofoils or centre boards
Definitions
- the present invention relates to a water craft having a keel.
- the invention relates to an amphibious vehicle having a keel.
- a keel is provided on the underside of a water craft, for example a boat, surfboard, sailboard or the like, one purpose of which being to assist in the stability and control of the craft in use, in particular against lateral wind and water forces.
- a keel In the case of a small water craft which is intended to be portable and to be stored on land, for example a surfboard or sailboard, a keel can make the craft less portable, and difficult to store.
- An amphibious vehicle is required to emulate a boat as closely as possible on water, as well as operating as a road vehicle on land.
- a keel is often provided on the hull of an amphibious vehicle to aid handling and manoeuvrability of the vehicle on water.
- the keel may strike or drag on the surface along which the vehicle is moving and thus become damaged.
- a water craft having a keel mounted to the underside of the craft, characterised in that the keel comprises an elongate member having at least one mounting formation for cooperative engagement with at least one corresponding mounting formation on the underside of the water craft, for removably mounting the elongate member on the water craft.
- the elongate member is preferably an extrusion.
- the elongate member is preferably flexible.
- the elongate member is adapted for sliding engagement with the at least one corresponding mounting formation on the underside of the water craft.
- the or each formation on the elongate member has a profile adapted for complementary engagement with the at least one corresponding mounting formation on the underside of the water craft.
- the at least one corresponding mounting formation is provided in or on a mounting member mounted to the underside of the water craft.
- the mounting member is an extrusion. More preferably, the mounting member is made from extruded aluminium.
- the water craft has a hull and the keel is removably mounted to the hull.
- the underside of the hull is a moulding having a channel formation, and the at least one corresponding mounting formation is. provided in or on a mounting member located in the channel.
- the water craft is an amphibious vehicle.
- the elongate member is made from rubber or synthetic rubber.
- the keel further comprises a tip member located adjacent a forward end of the elongate member.
- the elongate member has an elongate, longitudinal cavity.
- the elongate member may be adapted to be inflated, using either water or gas, to vary its profile.
- the cavity may be filled with a foam material.
- an amphibious vehicle having a hull and a keel mounted to the hull, characterised in that the keel comprises an elongate extruded member having at least one mounting formation for cooperation with a corresponding formation on an extruded mounting member attached to the hull, for removably securing the elongate member to the hull.
- the at least one corresponding formation is a re-entrant channel into which a formation on the elongate member is siidably received.
- the channel may be open at one end and the keel may further comprise a tip member attached to the hull adjacent the open end to prevent the elongate member from being withdrawn from the channel in use.
- a metal cap member is provided over the tip member.
- Figure 1 is a diagrammatic plan view from below of a water craft having a keel in accordance with the invention
- Figure 2 is a side view of the keel shown in Figure 1;
- Figure 3 is a diagrammatic cross-sectional view taken on line A- A, through apart of the base of the hull of Figure 1;
- Figure 4 is a diagrammatic cross-sectional view similar to that of Figure 3 but showing an alternative arrangement for mounting the keel to the hull;
- Figure 5 is a diagrammatic cross-sectional view similar to that of Figures 3 and 4, showing a further alternative arrangement for mounting the keel to the hull.
- a water craft in the form of an amphibious vehicle is indicated generally at 10 in Figure 1, having a body which incorporates a hull 12.
- a keel 14 is provided centrally on the base of the hull 12 in the longitudinal axis and extends along substantially the entire length of the base.
- the keel 14 comprises a main elongate member 16, which extends along the greater part of the length of the base of the hull 12.
- the elongate member 16 is formed as an extrusion of a relatively flexible material. Any suitable material can be used but in preferred embodiments the elongate member is made of rubber or synthetic rubber.
- the keel also has a tapered tip member 18 which is positioned adj acent to the forward end of the elongate member 16.
- the tip member 18 may be made of any suitable material but is also preferably made from rubber or synthetic rubber and is shaped to provide good hydrodynamic performance as the vehicle travels forwardly through the water.
- a metal cap 20 may be positioned over the tip member 18 to protect the tip member from damage. The metal cap 20 is shaped to complement the shape of the tip member.
- the keel 14 assists in the handling and manoeuvrability of the vehicle 10 on water.
- the material and configuration of the elongate member 16 are selected so as to provide sufficient lateral stiffness in order to withstand the lateral water pressures, whilst being readily compressible vertically to resist damage through impact with the ground when the vehicle is being used on land or in the transition between land and water use.
- the elongate member 16- Whilst the elongate member 16- is designed to resist being damaged, such damage may nevertheless occur.
- the elongate member 16 is adapted to be siidably removable from the hull 12, as will be described below. Removal of the elongate member 16 from the hull, may also be useful when servicing of the vehicle and/or repair of the hull are required.
- the tip member 18 and the metal cap 20 are also removably mounted to the hull so that the entire keel 14 can be removed for replacement and/or repair.
- the amphibious vehicle 10 is of a known construction and will not be described in any further significant detail.
- FIG. 3 Part of the base of the hull 12 is shown in Figure 3, which includes a channel formation 22 extending in the longitudinal axis of the hull 12 and having a re-entrant profile.
- the elongate member 16 is formed as a hollow extrusion of substantially bell or V-shaped cross-section and has an upper (as viewed) mounting portion 24 which is siidably received in the channel formation 22.
- the upper mounting portion 24 of the elongate member 16 has an outer profile which is formed so as to correspond with the re-entrant profile of the channel formation 22, to enable the elongate member to be securely mounted to the hull 12 in a complementary sliding fit.
- the hollow configuration of the elongate member 16 having a generally V-shaped cross- section provides the required lateral stiffness, but is readily compressible vertically.
- the elongate member 16 is produced from a rubber material having a hardness of Shore 45-55. If required, the elongate member 16 can be adapted so as to be inflatable, using either water or gas, in order that the profile of the elongate member can be varied.
- the cavity in the elongate member 16 is filled with a-foam material.
- the vertical and lateral stiffness of the elongate member 16 can be adjusted by appropriate selection of the foam material and the thickness and shape of the outer walls.
- a foam filled elongate member could be produced by means of a two-part extrusion process. Alternatively, the foam could be injected into the cavity of the elongate member 16 after it has been extruded.
- the channel formation 22 is closed at the rear end of the vehicle and open at the forward end such that the elongate member 16 can be slid into and out of the channel formation 22 through the open, forward end.
- the tip member 18 is fixed to the hull adjacent to the open end of the channel formation 22 to prevent the elongate member from being withdrawn from the channel formation in use.
- the tip member 18 may be solid rather than hollow so that it is less susceptible to impact damage than the elongate member 16.
- the metal cap 20 also helps to prevent the tip member 18 from being damaged and from being ripped off the hull in the case of an impact.
- the tip member 18 may be fixed to the hull using screws, bolts or like fasteners or may be bonded to the hull.
- the elongate member 16 can be easily removed from the hull 12, as required, by removing the metal cap 20 and the tip member 18 and sliding the elongate member out of the channel formation 22. To replace or fit the elongate member 16, the above procedure is reversed.
- the channel 22 is open at the forward end this is not essential and the channel could be open at the rearward end or indeed at both ends. Furthermore, whilst in the preferred embodiment the open end of the channel is closed by the tapered tip member 18 any suitable means for preventing withdrawal of the elongate member 16 could be used.
- FIG. 4 shows modified hull 12 for an amphibious vehicle in accordance with a preferred embodiment of the invention.
- the underside of the hull 12 is formed as a one-piece fibre- reinforced moulding having an integrally formed substantially rectangular channel formation 28.
- the channel formation 28 is shown as having substantially vertical faces, it will be understood by those skilled in the art that a draft angle could be applied to the vertical faces to aid de-moulding.
- a mounting member 30 is securely bonded in place in the channel formation 28, although any suitable securing means can be used.
- the mounting member 30 consists of an elongate extrusion having are-entrant channel formation32 which corresponds in profile with the profile of .the mounting formation 24 on the elongate member 16.
- the elongate member 16 is siidably secured in the channel 32 of the mounting member 30 in the same way as it was secured in the channel formation 22 in the previous embodiment.
- the extruded mounting member 30 can be manufactured from any suitable material but is preferably made of extruded aluminium (including aluminium alloys) or some other material which is capable of withstanding prolonged immersion in sea water.
- the corresponding mounting formation 32 for the elongate member 16 in a mounting member 30 which is itself attached to the hull By providing the corresponding mounting formation 32 for the elongate member 16 in a mounting member 30 which is itself attached to the hull, the need to produce a re-entrant mounting channel formation in the hull is avoided, so reducing manufacturing time and cost for the hull.
- the outer profile of the mounting member can be selected such that the channel formation 28 in the hull is easy to mould. Furthermore, because both the elongate member 16 and the mounting member 30 are extrusions, the time and cost of manufactuiing the keel can be kept to a minimum.
- FIG. 5 A further embodiment of a keel according to the invention is shown in Figure 5.
- two elongate extruded mounting members 34, 36 are mounted in a rectangular cross-section, channel formation 38 in the underside of the hull 12.
- Each extrusion 34, 36 is of a substantially rectangular box-section, wherein the lower wall of the box-section, as viewed, includes an aperture 40 which extends along the length of the extrusion 34, 36 such that each mounting member provides a re-entrant channel formation 41.
- the elongate member 42 is of substantially N-shaped cross-section and the free end of each limb of the V- shape includes an enlarged formation 44, which is siidably received in the channel 41 of a respective extrusion 34, 36.
- the enlarged formations 44 are of a dimension greater than the width of the-aperture 40 in each extrusion 34, 36, to siidably secure the elongate member 42 to the mounting members 34, 36 on the hull 12.
- the corresponding mounting formation on the underside of the water craft takes the form of a re-entrant channel
- any suitable formation(s) can be used to enable the elongate member to be removably mounted to the hull.
- the corresponding mounting formation could take the form of a number of channel portions spaced apart along the length of the underside of the water craft.
- the elongate member be a slide fit with the corresponding mounting formations this also is not essential and the elongate member can be arranged, for example, to be a snap fit with the corresponding mounting formations on the underside of the water craft.
- the elongate member is mounted by inserting one side at a time into the corresponding mounting formations rather than being slid in longitudinally.
- the elongate member is mounted by inserting one side at a time into the corresponding mounting formations rather than being slid in longitudinally.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Transportation (AREA)
- Toys (AREA)
- Body Structure For Vehicles (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003283570A AU2003283570A1 (en) | 2002-11-13 | 2003-11-12 | Flexible keel and fitting therefor |
US10/535,077 US20060027156A1 (en) | 2002-11-13 | 2003-11-12 | Flexible keel and fiting therefor |
GB0504625A GB2410220B (en) | 2002-11-13 | 2003-11-12 | Flexible keel and fitting therefor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0226443.0 | 2002-11-13 | ||
GBGB0226443.0A GB0226443D0 (en) | 2002-11-13 | 2002-11-13 | Water craft having a keel |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004043775A1 true WO2004043775A1 (en) | 2004-05-27 |
Family
ID=9947723
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2003/004918 WO2004043775A1 (en) | 2002-11-13 | 2003-11-12 | Flexible keel and fitting therefor |
Country Status (4)
Country | Link |
---|---|
US (1) | US20060027156A1 (en) |
AU (1) | AU2003283570A1 (en) |
GB (2) | GB0226443D0 (en) |
WO (1) | WO2004043775A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1516812A1 (en) * | 2003-09-16 | 2005-03-23 | Abeking & Rasmussen Schiffs- und Yachtwerft GmbH & Co. KG | Hull appendix for a watercraft |
WO2017160168A1 (en) * | 2016-03-16 | 2017-09-21 | Chung Jr Dominic N | Amphibious wheeled vehicle |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111930142B (en) * | 2020-08-04 | 2022-10-11 | 西北工业大学 | Multi-missile formation cooperative control method under uncontrollable speed condition |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1499226A (en) * | 1966-07-25 | 1967-10-27 | Boat building by assembly of prefabricated elements | |
US3747550A (en) * | 1971-03-02 | 1973-07-24 | H Stoeberl | Plastic sailboat body and keel assembly |
DE3722259A1 (en) * | 1987-07-06 | 1989-01-19 | J Bruno Dr Koeppl | Keel for sailing craft |
WO2000073130A1 (en) * | 1999-05-26 | 2000-12-07 | Per Kristian Larsen | Slidable and impact absorbing keel |
DE10034980A1 (en) * | 2000-07-19 | 2002-01-31 | Juergen Ruck | Flexible keel for sailing boat; has at least one tension element anchored on each side in the area of the keel base and supported in area of keel cube by adjustment unit and guided to produce curve |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3135975A (en) * | 1962-03-08 | 1964-06-09 | Ashoun M Andranigian | Amphibious boat trailer |
US3190587A (en) * | 1963-03-08 | 1965-06-22 | Volimer W Fries | Controllable shape hull structure |
US3361104A (en) * | 1966-02-28 | 1968-01-02 | John P. Glass | Boat hull and rail |
US3606432A (en) * | 1968-12-02 | 1971-09-20 | Robert W Honatzis | Protector strip |
US4741284A (en) * | 1984-05-22 | 1988-05-03 | The Coleman Company, Inc. | Molded plastic canoe |
US4892055A (en) * | 1988-08-05 | 1990-01-09 | Schad Robert D | Reinforced hull for a water craft |
US5501169A (en) * | 1995-05-26 | 1996-03-26 | Denker; James M. | Universal canoe accessory mounting bracket |
-
2002
- 2002-11-13 GB GBGB0226443.0A patent/GB0226443D0/en not_active Ceased
-
2003
- 2003-11-12 AU AU2003283570A patent/AU2003283570A1/en not_active Abandoned
- 2003-11-12 WO PCT/GB2003/004918 patent/WO2004043775A1/en not_active Application Discontinuation
- 2003-11-12 US US10/535,077 patent/US20060027156A1/en not_active Abandoned
- 2003-11-12 GB GB0504625A patent/GB2410220B/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1499226A (en) * | 1966-07-25 | 1967-10-27 | Boat building by assembly of prefabricated elements | |
US3747550A (en) * | 1971-03-02 | 1973-07-24 | H Stoeberl | Plastic sailboat body and keel assembly |
DE3722259A1 (en) * | 1987-07-06 | 1989-01-19 | J Bruno Dr Koeppl | Keel for sailing craft |
WO2000073130A1 (en) * | 1999-05-26 | 2000-12-07 | Per Kristian Larsen | Slidable and impact absorbing keel |
DE10034980A1 (en) * | 2000-07-19 | 2002-01-31 | Juergen Ruck | Flexible keel for sailing boat; has at least one tension element anchored on each side in the area of the keel base and supported in area of keel cube by adjustment unit and guided to produce curve |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1516812A1 (en) * | 2003-09-16 | 2005-03-23 | Abeking & Rasmussen Schiffs- und Yachtwerft GmbH & Co. KG | Hull appendix for a watercraft |
WO2017160168A1 (en) * | 2016-03-16 | 2017-09-21 | Chung Jr Dominic N | Amphibious wheeled vehicle |
Also Published As
Publication number | Publication date |
---|---|
GB2410220A (en) | 2005-07-27 |
GB0226443D0 (en) | 2002-12-18 |
GB0504625D0 (en) | 2005-04-13 |
AU2003283570A1 (en) | 2004-06-03 |
US20060027156A1 (en) | 2006-02-09 |
GB2410220B (en) | 2005-11-30 |
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