US20030041791A1 - Motorboat with a skimmer hull - Google Patents

Motorboat with a skimmer hull Download PDF

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Publication number
US20030041791A1
US20030041791A1 US10/277,825 US27782502A US2003041791A1 US 20030041791 A1 US20030041791 A1 US 20030041791A1 US 27782502 A US27782502 A US 27782502A US 2003041791 A1 US2003041791 A1 US 2003041791A1
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US
United States
Prior art keywords
hull
faces
tunnel
boat according
bow
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.)
Abandoned
Application number
US10/277,825
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English (en)
Inventor
Stephane Chollet
Remy Chollet
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of US20030041791A1 publication Critical patent/US20030041791A1/en
Abandoned 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 
    • B63B34/00—Vessels specially adapted for water sports or leisure; Body-supporting devices specially adapted for water sports or leisure
    • B63B34/40—Body-supporting structures dynamically supported by foils under water
    • 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
    • B63B1/24—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type

Definitions

  • the invention relates to a motorboat of the skimmer hull type.
  • One particular object of the present invention is to avoid these drawbacks of the prior art whilst retaining or improving on its advantages.
  • the invention proposes a motorboat with a skimmer hull, characterized in that the hull has a W-shaped cross section and comprises an inverted V-shaped longitudinal central tunnel which extends substantially all the length of the hull and whose bottom is substantially level with the waterline.
  • the hull according to the invention combines the capacity advantages of a wide V single-hull with the stability and performance advantages of a catamaran and increases the lifting surface area for the same draft and the same width.
  • the invention increases the width of the hull, for the same length, and consequently the capacity, whilst preserving exactly the same performance and speed potential.
  • the shape of the hull allows beaching in a stable horizontal position, with no risk of lateral tilting.
  • the bow is truncated, so that the central tunnel can extend to the most forward portion of the hull without significantly changing its shape
  • the angle of the walls of the tunnel is substantially constant over all of the length of the hull
  • the base line of the tunnel can be slightly inclined downwardly from the bow toward the stern, to generate longitudinal lift and improve the horizontal trim of the boat when in motion
  • a hydrofoil type transverse aileron is mounted between the walls of the tunnel in the aft portion of the hull to generate supplementary lift at the stern and to compensate at least partly for the weight of the motors.
  • the invention applies generally to motor launches, both civil and military, and to “aquabikes” (sit-down jet skis, stand-up jet skis, etc.), and enables to increase their capacity, stability and performances.
  • FIG. 1 is a diagrammatic front view of a hull according to the invention
  • FIG. 2 is a bottom view of this hull
  • FIG. 3 is a side view of this hull
  • FIG. 4 is a perspective view of this hull
  • FIG. 5 is a diagrammatic view in cross section of a different embodiment
  • FIGS. 6, 7, 8 and 9 are views corresponding to FIGS. 1 to 4 but representing a further embodiment of the invention.
  • FIG. 10 is a diagrammatic front view of a still further embodiment.
  • FIG. 11 is a diagrammatic partial side view corresponding to FIG. 10.
  • the hull comprises four longitudinal faces 10 , 12 , 14 , 16 , i.e. which extend from the forward end to the aft end of the hull and in cross section form a W-shape.
  • these faces are substantially plane and symmetrical in pairs with respect to longitudinal vertical planes passing through the vertices of the W-shape.
  • an exterior face 10 and an adjacent median face 12 are symmetrical with respect to a longitudinal vertical plane 18 passing through the vertex of a V-shape formed by the faces 10 and 12
  • the median faces 12 and 14 are symmetrical with respect to a median longitudinal vertical plane 20
  • the median face 14 and the other exterior face 16 are symmetrical with respect to a longitudinal vertical plane 22 passing through the vertex of the V-shape formed by the faces 14 and 16 .
  • the angle of the faces 10 , 12 , 14 , 16 to the vertical is approximately 45°. As a general rule, it can be from approximately 40° to approximately 75°. In what is currently the preferred embodiment, this angle is from approximately 55° to approximately 70° and is even more preferably close to 63°.
  • the median faces 12 and 14 form an inverted V-shape central tunnel whose vertex 24 is substantially at the same level as the waterline 26 and extends longitudinally at the level of this waterline from the stern to the vicinity of the bow 28 , where it rises upwardly.
  • the bow 28 is truncated transversely, so that the central tunnel formed by the faces 12 and 14 starts in the most forward part of the hull, and the faces 12 and 14 retain the same angle over virtually all of the length of the hull and flare slightly in the immediate vicinity of the bow.
  • the hull may comprise an exterior step 30 which extends from the stern as far as the vicinity of the bow, but without going right up to the bow.
  • the bow can then have a slightly oval shape for maximum capacity.
  • Strakes 32 which either project, as shown in FIG. 1, or are recessed (as shown in FIG. 5) can also be formed on the exterior faces 10 and 16 , as well as on the median faces 12 and 14 , and extend from the stern as far as the vicinity of the forward end of the exterior step 30 .
  • the exterior step 30 and the strakes 32 can extend as far as the immediate vicinity of the bow 28 .
  • the hull according to the invention has a lifting surface area which is greater than that of a V-shaped hull with the same draft and the same width.
  • the increase is of the order of 25% if the draft is substantially equal to half the width of the hull.
  • the hull is again W-shaped in cross section, but the exterior faces 10 and 16 are no longer symmetrical to the median faces 12 and 14 with respect to the respective longitudinal vertical planes 18 and 22 , although the median faces 12 and 14 are symmetrical to each other with respect to the median longitudinal vertical plane 20 .
  • the angles of the median faces 14 , 16 to the vertical are less than the angles of the exterior faces 10 , 16 to the vertical.
  • the base line 24 of the tunnel formed by the median faces 12 and 14 is substantially rectilinear and level with the waterline 26 , but slightly inclined downwardly relative to the horizontal from the bow toward the stern. This slightly increases the angle between the two faces 12 and 14 at the aft end of the hull. This increases the lift acting on the hull at the aft end thereby holding the hull more horizontal when in motion.
  • exterior steps 30 can be formed on the exterior faces 10 , 16 of the hull and extend from the stern to the vicinity of the bow or right up to the bow.
  • strakes 32 can be formed on the outside faces 10 and 16 and possibly on the median faces 12 and 14 of the hull.
  • FIGS. 10 and 11 which corresponds to the embodiment of FIGS. 1 to 4
  • the two median faces 14 and 16 of the hull are joined together at the aft end of the hull by a hydrofoil type transverse aileron 34 , which is under the water and whose curved profile has its concave side facing downward, to increase the lift at the aft end of the hull and at least partly compensate for the weight of the motors.
  • This aileron can be removably mounted between the faces 14 , 16 of the hull.
  • a hull according to the invention has the following advantages, in addition to those already mentioned of improved stability, increased capacity and beaching in a stable horizontal position:
  • the lift is increased at the aft end by the features shown in FIGS. 5 to 10 and the boat remains substantially horizontal when in motion, and
  • the boat can turn level.

Landscapes

  • 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)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Hydraulic Turbines (AREA)
US10/277,825 2000-04-28 2002-10-23 Motorboat with a skimmer hull Abandoned US20030041791A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0005599A FR2808250B1 (fr) 2000-04-28 2000-04-28 Bateau a moteur a coque planante
FR00-05599 2000-04-28
PCT/FR2001/001277 WO2001083289A1 (fr) 2000-04-28 2001-04-25 Bateau a moteur a coque planante

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2001/001277 Continuation WO2001083289A1 (fr) 2000-04-28 2001-04-25 Bateau a moteur a coque planante

Publications (1)

Publication Number Publication Date
US20030041791A1 true US20030041791A1 (en) 2003-03-06

Family

ID=8849811

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/277,825 Abandoned US20030041791A1 (en) 2000-04-28 2002-10-23 Motorboat with a skimmer hull

Country Status (5)

Country Link
US (1) US20030041791A1 (fr)
EP (1) EP1276661A1 (fr)
AU (1) AU2001256412A1 (fr)
FR (1) FR2808250B1 (fr)
WO (1) WO2001083289A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005115830A1 (fr) * 2004-05-28 2005-12-08 Bergquist Goeran Canoe
US20130145978A1 (en) * 2011-12-09 2013-06-13 3Madmen Wakesurfing boat and hull for a wakesurfing boat
US8590475B2 (en) 2011-12-09 2013-11-26 3Madmen Wakesurfing boat and hull for a wakesurfing boat
US9238499B1 (en) 2015-04-01 2016-01-19 3Madmen Wakesurfing boat

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191503951A (en) * 1914-03-12 1916-03-09 William Albert Hickman Improvements in Motor or Hydroplane Boats.
US2422818A (en) * 1943-08-02 1947-06-24 Julien G Bamberger Hydroplane
US2612130A (en) * 1949-08-16 1952-09-30 Johannes H Wendt Concave bottom hull construction
US3216389A (en) * 1964-01-20 1965-11-09 Ole I Thorsen Boat hull
FR1401511A (fr) * 1964-05-19 1965-06-04 Adaptation d'une aile et d'un fond de coque pour bateaux à voile à portance hydrodynamique
US3625173A (en) * 1969-08-08 1971-12-07 Mitton Hulls for power boats
FR2119157A5 (fr) * 1970-12-22 1972-08-04 Boismard Pierre
IT1125295B (it) * 1976-10-28 1986-05-14 Cantiere Navaltecnica Spa Catamarano con ali protanti stabilizzato giroscopicamente
FR2586993A1 (fr) * 1985-09-12 1987-03-13 Floch Yvan Carene d'engin de locomotion sur eau
FR2634450B1 (fr) * 1988-07-21 1994-12-09 Lefevre Jean Marc Navire catamaran

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005115830A1 (fr) * 2004-05-28 2005-12-08 Bergquist Goeran Canoe
US20130145978A1 (en) * 2011-12-09 2013-06-13 3Madmen Wakesurfing boat and hull for a wakesurfing boat
US8590475B2 (en) 2011-12-09 2013-11-26 3Madmen Wakesurfing boat and hull for a wakesurfing boat
US8857364B2 (en) 2011-12-09 2014-10-14 3Madmen Wakesurfing boat and hull for a wakesurfing boat
US9238499B1 (en) 2015-04-01 2016-01-19 3Madmen Wakesurfing boat
US9242700B1 (en) 2015-04-01 2016-01-26 3Madmen Wakesurfing boat

Also Published As

Publication number Publication date
FR2808250B1 (fr) 2002-08-16
WO2001083289A1 (fr) 2001-11-08
AU2001256412A1 (en) 2001-11-12
EP1276661A1 (fr) 2003-01-22
FR2808250A1 (fr) 2001-11-02

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Legal Events

Date Code Title Description
STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION