WO2004103744A1 - Coque pour vehicule amphibie - Google Patents

Coque pour vehicule amphibie Download PDF

Info

Publication number
WO2004103744A1
WO2004103744A1 PCT/GB2004/002165 GB2004002165W WO2004103744A1 WO 2004103744 A1 WO2004103744 A1 WO 2004103744A1 GB 2004002165 W GB2004002165 W GB 2004002165W WO 2004103744 A1 WO2004103744 A1 WO 2004103744A1
Authority
WO
WIPO (PCT)
Prior art keywords
hull
strake
section
strakes
underside
Prior art date
Application number
PCT/GB2004/002165
Other languages
English (en)
Inventor
Ian Richard Peirce
Mathew Roger Pease
Original Assignee
Gibbs Technologies Limited
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 Gibbs Technologies Limited filed Critical Gibbs Technologies Limited
Publication of WO2004103744A1 publication Critical patent/WO2004103744A1/fr

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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

Definitions

  • the present invention relates to a hull and, in particular, to a hull for an amphibious vehicle.
  • the designers of planing hulls for watercraft usually adopt a deadrise angle of between 14 and 18 degrees amidships.
  • the angle may flatten along the run aft to 2.5 to 4 degrees at the transom.
  • the applicant has determined that for an amphibious vehicle with a planing hull it is desirable to have a maximum deadrise angle of about 6 degrees on the planing surface in order to provide for adequate ground clearance when the vehicle is used on a road.
  • Such a low deadrise angle detrimentally affects directional stability of a hull when planing on water.
  • the applicant provides a pair of strakes running lengthwise along the underside of the hull in order to improve directional stability of the hull when planing on water.
  • a keel is a protrusion from the smooth under surface of a hull along its longitudinal centre line. This definition dates back to the days of wooden ships, when the keel was the first part of the ship to be laid down during its build.
  • keel has been applied to one, or a pair of, deep fin(s) which extend downwards from a hull on, or on either side of, its longitudinal centre line.
  • fins are also known as skegs, and are particularly popular on sail driven vehicles, from windsurfers to yachts; where their depth can provide great stability against lateral wind forces.
  • Strakes are relatively shallow structures, of similar depth to a central, full length, keel; but laterally displaced to either side of a vessel's longitudinal centre line.
  • Skegs are readily distinguished from strakes, in that: a) skegs are only about one quarter the length of the hull, whereas strakes extend along substantially the full hull length; b) skegs are themselves of greater depth to the rest of the hull structure - considerably deeper in the case of a windsurfer - whereas a strake would typically be less than 10% as deep as the rest of the hull; c) skegs are rarely, if ever, fitted to amphibious vehicles; because they would nullify ground clearance, and because amphibians are not generally wind powered.
  • Amphibious vehicles operating in displacement mode are limited to a speed of around six knots. At such speeds, which hold little marketing appeal, hydrodynamic aids have little effect; and the vessel remains substantially level when turning.
  • a planing amphibious vehicle may travel on water at 15 knots or more, and will lean into corners; so strakes can be useful hydrodynamic aids.
  • Keels and strakes are particularly useful for vessels driven by water jets, which have no dependent structures below the general level of the hull.
  • the drive pod, propeller, and rudder of an outboard motor can act as lateral stabilizers .
  • the present invention provides in a first aspect a hull for an amphibious vehicle with an underside submersible in water and at least one strake extending lengthwise along at least part of the underside, wherein the strake at least in part has a pair of surfaces which both extend downwardly from the hull at an angle of 75 degrees to 90 degrees to horizontal when the hull is level, each of the surfaces when immersed in water capable of giving rise to a lateral force on the hull during turning of the hull in water.
  • the present invention provides in a second aspect a hull for an amphibious vehicle with an underside submersible in water and at least a first pair of strakes extending parallel to each other lengthwise along at least part of the underside, wherein each strake at least in part has a pair of surfaces which both extend downwardly from the hull at an angle of 75 degrees to 90 degrees to the horizontal when the hull is level, each of the surfaces when immersed in water capable of giving rise to a lateral force on the hull during turning of the hull in water.
  • the two strakes of said pair are preferably located one each on either side of a keel provided centrally on the underside of the hull, the strakes being spaced equidistantly from the keel.
  • each strake of the prior art has been provided in parallel extending pairs on the underside of a hull, but have been triangular in cross-section so that each strake has one side inclined to provide a significant resistive transverse force during turning, but with the other side inclined to provide little resistive transverse force during turning.
  • both sides of each strake are used to provide a significant resistive transverse force.
  • the or each strake has a forward part which is substantially triangular in transverse cross-section and a rearward section which is substantially quadrilateral in transverse cross-section.
  • the or each section has a pair of surfaces each capable of giving rise to a lateral force, but said forces are greater, and more evenly balanced, at the rearward section.
  • a strake with a pair of sides capable of giving rise to greater resistive transverse forces, because otherwise the hull will be difficult to turn in water when not planing. It is only the rear of the underside of the hull which remains immersed in water when the hull is planing.
  • the or each strake extends along the majority but not the complete length of the underside of the hull.
  • the or each strake does not extend lower than the lowest part of a keel of the hull. Where the hull has removable panels then the or each strake can extend over the panels.
  • the or each strake can have a section formed integrally with the hull and a section formed independently of the hull and then fixed to the hull.
  • the said independently formed sections can be forward or rearward removable sections, so as to ease replacement when damaged.
  • An independently formed section can extend over a removable panel in the underside of the hull and can be removable to allow removal of the removable panel.
  • Figure 1 is a plan view of an underside of a hull according to the present invention.
  • Figure 2 is a perspective view from below of the hull of Figure 1
  • Figure 3 is a cross-section through the hull of Figure 1 taken along the line x-x' ;
  • Figure 4 is a cross-section through the hull of Figure 1 taken along the line y-y' ;
  • Figure 5 is a detail view of the cross-section of Figure 3.
  • Figure 6 is a detail view of the cross-section of Figure 4.
  • FIGs 1 and 2 there can be seen a hull 11 of an amphibious vehicle 10 having a forward bow end 12 and rear stern end 13.
  • the underside of the hull 11 is shown and provided on the underside are a pair of strakes 14, 15 spaced equidistantly from a keel 16.
  • Each strake 14, 15 runs lengthwise along the underside of the hull 11 for the majority of, but not the whole length of, the hull 11.
  • the underside of the hull 11 is provided with removable panels 7, 8, 17, 18 which are hydrodynamic aids (planing plates) as described in the applicant's co-pending UK patent application no. 0311499.8 entitled ⁇ A Hull For An Amphibious Vehicle' .
  • One section of each strake 14, 15 is formed integrally with the hull 11 and another section formed integrally with, or assembled to, one of the removable panels 17, 18.
  • the forward sections of the strakes 14, 15 are triangular in cross-section, as can be seen in Figure 3, and in detail for strake 14 in Figure 5, Figure 5 being an enlarged view of part of the cross-section of Figure 3, showing strake 14 in detail.
  • the strake 14 has a face 19 which extends at an angle ⁇ of approximately 50 degrees to the horizontal when the hull is level and a face 20 which extends at an angle ⁇ of approximately 15 degrees to the horizontal when the hull is level.
  • the strake 15 is a mirror image of the strake 14. It too has faces inclined at different angles. Strakes 14 and 15 are shown with rounded corners between faces 19 and 20. This aids demoulding, particularly in series production. If it is desired that any part of strakes 14 and 15 which is not immersed in water should act as a spray rail, it may be moulded with a sharp corner between the inclined faces.
  • the rearward sections of the strakes 14, 15 are quadrilateral in cross section, as can be seen in Figure 4 and in detail for strake 15 in Figure 6, Figure 6 being an enlarged view of part of the cross-section of Figure 4, showing strake 15 in detail.
  • the strake has a face 23 which extends at an angle ⁇ of approximately 82 degrees to the horizontal when the hull is level and a face 24 which extends at an angle ⁇ of approximately 85 degrees to the horizontal when the hull is level.
  • angles ⁇ , ⁇ may be substantially equal, say 85 degrees.
  • angles ⁇ , ⁇ could be any angle from 75 to 90 degrees.
  • Strake 14 is of the same cross- section as strake 15, but in mirror image thereto.
  • the quadrilateral shaped sections of the strakes 14, 15 give the hull good turning characteristics since the strakes together present a pair of faces giving rise to lateral forces on the hull for each sense of rotation of the hull, one face being provided by each strake.
  • the hull does not provide excessive resistance to turning when the hull is not planing because of the triangular cross-section shape of the forward sections of the strakes 14, 15.
  • the rearward sections of the strakes 14, 15 can be made independently of the hull 11 and then be fixed to the hull 11. These sections may suffer from wear in use and thus can be made replaceable. They can also be made removable to allow removal of the removable panels 17 and 18.
  • the keel 16 is replaceable and takes the majority of wear during road use of the vehicle, as disclosed in the applicant's co-pending application no. GB0226443.0.
  • the strakes 14 and 15 preferably do not extend lower than the keel 16 so that the keel preferentially receives ground impacts suffered by the hull in road use rather than the strakes 14, 15.
  • strakes 14, 15 are provided on the underside of hull 11, it will be appreciated that just one strake or indeed an array of strakes may be beneficially employed. Also, the location of strakes may be varied. Furthermore, whilst the section of the strakes in the preferred embodiment reduces from root to tip (i.e. the faces taper/converge to some degree), it is envisaged that alternative embodiments of hull according to the present invention could beneficially employ strakes whose section increases from root to tip (i.e. the faces diverge, of so-called 're-entrant' form) . This may be achieved with integrally moulded strakes or independent strakes which are assembled or are retrofit additions.
  • the strakes may be located inboard of wheel arches in the hull.
  • the road wheels may be mounted on retractable suspensions as is known in the amphibious vehicle art, so that the wheels can be retracted on water to reduce hydrodynamic drag.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

Cette invention concerne une coque de bateau (11) voir figures 1-3 munie d'une ou plusieurs virures espacées latéralement (14, 15) et éventuellement d'une quille (16). Chacune des extrémités avant de virure peut présenter une section triangulaire (figure 2), alors que chaque extrémité arrière présente une section polygonale à quatre côtés (figure 3). Chaque virure peut se prolonger sur la quasi totalité de la longueur de la coque, mais pas sur le fond de cette dernière. Les virures peuvent passer sur des panneaux déposables dans le dessous de la coque. Une partie des virures peut faire partie intégrante de la coque et une autre partie être fixée à la coque, tout en en étant distincte. L'agencement des virures convient tout particulièrement pour un véhicule amphibie avec angle réduit de relevé de varangue du fait que les virures ont peu d'incidence sur la garde au sol, mais agissent néanmoins comme auxiliaires dynamiques dans l'eau. La section avant triangulaire permet de virer en mode déplacement, alors que la section arrière résiste au virage tant en mode de déplacement qu'en mode planant.
PCT/GB2004/002165 2003-05-19 2004-05-19 Coque pour vehicule amphibie WO2004103744A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0311500A GB2401833B (en) 2003-05-19 2003-05-19 A hull for an amphibious vehicle
GB0311500.3 2003-05-19

Publications (1)

Publication Number Publication Date
WO2004103744A1 true WO2004103744A1 (fr) 2004-12-02

Family

ID=9958366

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/002165 WO2004103744A1 (fr) 2003-05-19 2004-05-19 Coque pour vehicule amphibie

Country Status (2)

Country Link
GB (1) GB2401833B (fr)
WO (1) WO2004103744A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005084969A2 (fr) 2004-03-08 2005-09-15 Gibbs Technologies Ltd. Vehicule amphibie
WO2005115775A1 (fr) * 2004-05-24 2005-12-08 Gibbs Technologies Limited Vehicule amphibie

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2785274A1 (fr) 2009-12-22 2011-06-30 Gibbs Technologies Limited Vehicule amphibie
KR20140037215A (ko) 2011-06-13 2014-03-26 깁스 테크놀로지스 리미티드 수륙양용 선체
JP6061925B2 (ja) * 2011-06-30 2017-01-18 ギブズ テクノロジーズ リミテッド 水陸両用車

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2370508A (en) * 1941-09-15 1945-02-27 Leighton A Wilkie Amphibious vehicle
FR1311468A (fr) * 1961-11-27 1962-12-07 Véhicule de camping amphibie
GB1433824A (en) * 1972-06-06 1976-04-28 Bekaert Sa Nv Amphibious vehicles
US4025010A (en) * 1973-07-16 1977-05-24 Olaf Soot Retractable motor mount
US4348195A (en) * 1979-05-10 1982-09-07 Lantz George H Multiple step vented hull
US6186086B1 (en) * 2000-01-19 2001-02-13 James F. Zender Planing boat hull and methods of making same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6066014A (en) * 1998-08-17 2000-05-23 Polaris Industries Inc. Small watercraft exhaust device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2370508A (en) * 1941-09-15 1945-02-27 Leighton A Wilkie Amphibious vehicle
FR1311468A (fr) * 1961-11-27 1962-12-07 Véhicule de camping amphibie
GB1433824A (en) * 1972-06-06 1976-04-28 Bekaert Sa Nv Amphibious vehicles
US4025010A (en) * 1973-07-16 1977-05-24 Olaf Soot Retractable motor mount
US4348195A (en) * 1979-05-10 1982-09-07 Lantz George H Multiple step vented hull
US6186086B1 (en) * 2000-01-19 2001-02-13 James F. Zender Planing boat hull and methods of making same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005084969A2 (fr) 2004-03-08 2005-09-15 Gibbs Technologies Ltd. Vehicule amphibie
WO2005115775A1 (fr) * 2004-05-24 2005-12-08 Gibbs Technologies Limited Vehicule amphibie
GB2429437A (en) * 2004-05-24 2007-02-28 Gibbs Tech Ltd An amphibious vehicle
GB2429437B (en) * 2004-05-24 2008-05-07 Gibbs Tech Ltd Amphibious vehicle with v hull sections

Also Published As

Publication number Publication date
GB2401833A (en) 2004-11-24
GB0311500D0 (en) 2003-06-25
GB2401833B (en) 2006-02-01

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