EP0304821B1 - Bateau à réaction - Google Patents

Bateau à réaction Download PDF

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Publication number
EP0304821B1
EP0304821B1 EP88113521A EP88113521A EP0304821B1 EP 0304821 B1 EP0304821 B1 EP 0304821B1 EP 88113521 A EP88113521 A EP 88113521A EP 88113521 A EP88113521 A EP 88113521A EP 0304821 B1 EP0304821 B1 EP 0304821B1
Authority
EP
European Patent Office
Prior art keywords
boat
stern
foot
jet
water
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
EP88113521A
Other languages
German (de)
English (en)
Other versions
EP0304821A1 (fr
Inventor
Noboru Kobayashi
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.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha Motor Co Ltd
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
Priority claimed from JP62213010A external-priority patent/JP2676345B2/ja
Priority claimed from JP62220392A external-priority patent/JP2666139B2/ja
Application filed by Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Publication of EP0304821A1 publication Critical patent/EP0304821A1/fr
Application granted granted Critical
Publication of EP0304821B1 publication Critical patent/EP0304821B1/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
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
    • 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
    • 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
    • B63B34/10—Power-driven personal watercraft, e.g. water scooters; Accessories therefor

Definitions

  • the invention relates to a jet boat having a hull and a deck supporting a raised seat bench extending from the stern towards the bow, and a control cockpit provided in front thereof approximately at the longitudinal center of the boat, a foot trough opening towards the stern being formed on each side of said seat bench.
  • a jet boat of this type should always be provided with a low boarding sill permitting the rider to climb aboard in deep water, for instance after having been thrown off by a wave.
  • the sternwards open foot troughs permit water to flow thereinto when the jet boat is drifting, which is rather disagreeable, particularly when the rider wants to carry out an activity, such as fishing, from the drifting boat.
  • the rider's feet wouls always be awash, which is rather uncomfortable.
  • this object is attained by the provision that a jet boat as indicated above is designed such that the foot troughs merge with a depressed gutter area of the front deck portion extending ahead of the control cockpit to form a continuous depressed area of the deck together with the foot troughs, and in that a transverse body is provided extending across the foot troughs adjacent to the rearward ends thereof but being disposed at a spaced location from the stern of the boat, the height of the transverse body above the bottom of the foot trough such as to obstruct the inflow of water from the stern when the boat is at rest or drifting, but allowing water to be drained from the foot troughs when the boat is under way, driven by a common jet propulsion system.
  • the transverse body is formed as a transverse baffle in the form of a step.
  • This offers the advantage of facilitating the boarding of the jet boat from the water, as it is possible to grip the transverse baffle when so boarding. For reaching the deck it is initially not required to step over the transverse baffle, because the boarding sill is as low as in the conventional construction.
  • the transverse body may also be formed as a ramp rising towards the stern, resulting in the advantage that spray water entering the foot troughs during the ride can be discharged in a particularly simple manner.
  • the transverse body may be of resiliently compressible anture, permitting it in effect to act as a valve.
  • the resiliently compressible nature of the transverse body also offers the possibility of locating it immediately at the stern. This is because when the rider wants to board the jet boat from the water and to this purpose supports his weight on the transverse body, the latter is compressed, so that due to the compression of the resilient transverse body the boarding sill will essentially be no higher than that of a conventional jet boat without a transverse body. For this reason independent protection is claimed for this embodiment.
  • the resiliently compressible nature of the transverse body may be obtained in a simple manner by forming it as a rubber-elastic tubular bellows.
  • This tubular bellows is capable of being easily compressed and of subsequently returning to its original shape.
  • the transverse body may also be formed as a buoyant flap mounted on the deck for pivoting about a for'ard horizontal axis, permitting the flap to return to its obturating position in the absence of a force acting thereon from above, to thereby prevent the inflow of water into the foot troughs from the stern.
  • the buoyant flap offers the further advantage that it obturates the foot troughs only when the stern is submerged to a depth at which water would flow into the foot trough in the absence of a transverse body. Otherwise the top surface of the flap lies flat, so that spray water or the like entering the foot troughs during the ride is permitted to flow off at the stern.
  • the aft end portions of the foot troughs may be formed with a recess of triangular cross section and having a boundary wall facing towards the stern, in which case the flap is likewise of triangular shape and mounted along one of its sides for pivoting about a horizontal transverse axis, so that the flap is capable of being substantially received in the recess,, the bottom of the latter being provided with a drain opening.
  • the flap As soon as the aft end of the jet boat is immersed to a predetermined depth, water is permitted to flow into the recess through the drain opening, causing the flap to float up so as to assume its obturating position.
  • the flap As a result of the flap's shape being complementary to that of the recess, the flap is caused to float up already before any water flows into the foot troughs from the stern. The flap thus obturates the aft end of the foot troughs only when positively required, but then early enough to prevent any water from flowing into the foot troughs.
  • the drain opening of the recess may communicate with a drain pipe opening towards the stern below the waterline of the hull.
  • the drain pipe creates an injector pump effect due to the drop of the static pressure at the mouth of the drain pipe for positively draining any water from the recess.
  • the flaps are automatically retracted into the recesses when the jet boat is under way, and that even when the lower portions of the recesses are at least partially below the water line. Any water present in the foot troughs is thus permitted to be completely drained therefrom as long as the jet boat is under way.
  • the described embodiment offers the further important advantage that astern travel of the jet boat would immediately cause water to flow into the recesses, so that the flaps would be raised to the obturating position, even if the stern were substantially above the water level. The stern wave created by the astern travel is thus prevented from entering the foot troughs.
  • Jet boat 1 has a substantially flat hull 2 carrying a likewise substantially flat deck 3.
  • a jet propulsion system 4 with a jet nozzle 5 opening at the lower stern.
  • Jet propulsion system 4 is powered by an engine 6 disposed adjacent the longitudinal center of hull 2, or more accurately, at the center of gravity CG.
  • a tank 7 Disposed for'ard of engine 6 is a tank 7 for the fuel supply of engine 6.
  • Deck 3 carries a raised seat bench 9 extending for'ards from stern 8.
  • Seat bench 9 comprises a driver's seat 10 and a pillion seat 11.
  • For'ards of seat bench 9 there is a control cockpit 12 comprising motorcycle-type handlebars 13 connected in a per se known and therefore not detailedly shown manner to jet propulsion system 4.
  • Control cockpit 12 is located above center of gravity CG, and thus above engine 6.
  • Seat bench 12 extends beyond control cockpit 12 towards the bows 14 so as to form a front seat 15 for'ard of control cockpit 12.
  • Formed in deck 3 about seat bench 9 is a gutter 16 defined by coamings 17.
  • gutter 16 merges with two foot troughs 18, 19 opening towards stern 8.
  • the aft ends of foot troughs 18, 19 are each obturated by a respective transverse body 20 spaced from stern 8 for preventing the inflow of water from the stern.
  • hull 2 of jet boats 1 is of a combined box-shaped and triangular construction, the bottom side 21 of the substantially rectangular hull bottom 22 being formed with a substantially triangular raised portion 23 extending towards the stern.
  • the for'ard portion of hull bottom 22 is substantially box-shaped and relatively flat, whereas the aft portion of hull bottom 22 is of a more or less triangular cross-sectional shape extending to a greater depth.
  • the two lateral sides 24 and 25 of hull 2 extend substantially parallel to one another and perpendicular to the lateral edges of bottom 22. In the stopped condition, i.e. with the jet boat 1 adrift, the major part of hull sides 24 and 25 is immersed in the water.
  • hull 2 may be even more clearly described with reference to the different waterlines (a) to (e) corresponding to various load and operating conditions. These waterlines are depicted in figs. 6 and 7.
  • the waterline (a) applies when driver's seat 10 and pillion seat 11 of seat bench 9 are occupied by two persons and jet boat 1 is under way. In this case the water line substantially circumscribes a triangle as clearly shown in fig. 7.
  • a course alteration causes hull 2 to heel, resulting in a corresponding displacement of the waterline.
  • This state is depicted in fig. 7 by waterline (b) corresponding to a course alteration to port. It is to be noted that under these conditions the box-shaped bow section of hull 2 remains clear of the water, the waterline (b) being still of a substantially triangular configuration.
  • Waterline (c) corresponds to the state in which the two seats 10 and 11 of seat bench 9 are occupied by two persons while jet boat 1 is not under way, i.e. adrift. In this state both sides 24, 25 of hull 2 are immersed to a major part. With the exception of its for'ard portion, waterline (c) circumscribes a substantially rectangular shape in this state. The for'ard portion of waterline (c) encloses an angle ⁇ with its apex centered on the longitudinal centerline CL of jet boat 1.
  • Waterline (d) corresponds to the state in which jet boat 1 is adrift and driver's seat 10 and front seat 15 are each occupied by a passenger. It is readily noted that the for'ard portion of waterline (d) has been displaced farther for'ard, resulting in a spreading of the enclosed angle ⁇ ′ . The configuration of the waterline thus approaches that of a rectangle still further.
  • the waterline designated (e) in fig. 6 corresponds to the state that the boat is adrift while only front seat 15 is occupied by a passenger. This state is also depicted in fig. 7, clearly showing that waterline (e) approaches the rectangular shape still further, although bows 14 is immersed somewhat deeper than stern 8. The for'ard portion of waterline (e) now encloses the maximum angle ⁇ ′′. Also under these conditions, the major part of the hull's sides 24 and 25 remains immersed.
  • the transverse body is formed as a baffle 20 extending transversely of the longitudinal direction of the troughs somewhat for'ard of stern 8.
  • Baffle 20 obturates the aft end of the respective foot trough 18, 19 to prevent the inflow of water thereinto from the stern when the latter is deep in the water.
  • baffle 20 is located far enough for'ard of stern 8 for not hampering boarding of the boat from the water.
  • Baffle 20 may even be used as a grip ledge to facilitate boarding from the stern.
  • the transverse body comprises a resiliently compressible tubular bellows 26 extending transversely of foot troughs 18, 19.
  • the non-deformed or relaxed state of bellows 26 is depicted in solid lines.
  • the exertion of pressure from above, for instance by pushing downwards with a foot, causes bellows 26 to assume the shape indicated by dotted lines.
  • the thus designed transverse body may thus be of a greater height than a rigid body without thereby preventing water that has entered foot troughs 18, 19 from flowing off towards the stern.
  • the exertion of sufficient pressure on bellows 26 permits any water to be drained from the foot troughs while the jet boat is under way. To accomplish this effect the drievr or pillion-rider may for instance stand on bellows 26 while the boat is under way.
  • the transverse body is formed as a flap mounted for pivoting about a horizontal pivot axis extending transversely of foot troughs 18, 19.
  • Flap 28 is biased by a spring element 29 towards the obturating position shown in fig. 6, in which flap 28 prevents the water inflow from the stern into foot troughs 18, 19.
  • Spring element 29 may be compressed by stepping onto flap 28 for permitting water already present in foot troughs 18, 19 to flow off towards the stern.
  • FIG. 8 and 9 Shown finally in figs. 8 and 9 is an embodiment comprising a transverse body in the form of a buoyant flap 28.
  • the aft end portion of each foot trough 18, 19 is provided with a recess 30 of triangular cross-sectional shape extending transversely of deck 3.
  • the lowermost portion of recess 30 is provided with a drain opening communicating with a drain pipe 31 extending to the bottom side 21 of the hull's bottom 22 with its mouth opening towards stern 8.
  • the for'ard portion of flap 28 is pivotally mounted about a horizontal pivot axis 27 extending transversely of foot troughs 18, 19.
  • the two dash-dotted lines (f) and (g) in figs. 8 and 9 illustrate the respective waterline.
  • the waterline (f) in fig. 8 corresponds to the normal operating condition, with jet boat 1 under way and driver's seat 10 and pillion seat 11 occupied by two passengers.
  • the waterline (g) in fig. 9 corresponds to the state in which jet boat 1 is drifting with stern 8 under excessive load as by a single person aboard occupying pillion seat 11. In this state water flows into recess 30 both from the stern and through drain pipe 31, causing flap 28 to float up. As a result, flap 28 obturates the aft portions of foot troughs 18, 19 to thereby prevent the inflow of water.
  • flap 28 When the jet boat is under way, flap 28 is also lowered into recess 30 even when the waterline (f) is not below the lowermost portion of recess 30. This is because when jet boat 1 is under way, an injector pump effect is created at the mouth of drain pipe 31, causing water contained in recess 30 to be drained therefrom, so that flap 28 cannot float up. As soon as the speed of the boat is reduced, the static pressure adjacent the mouth of drain pipe 31 at the bottom side 21 of the hull will rise, as a result of which flap 28 is permitted to float up to thereby obturate the aft end portion of foot troughs 18, 19.
  • transverse body 20 All of the described embodiments of the transverse body 20 have in common that the flow-off of water already present in foot troughs 18, 19 is scarcely hampered, while the inflow of water from the stern is substantially prevented. Boarding of jet boat 1 from the water over the stern is not hampered by any of the transverse bodies 20.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Hydraulic Turbines (AREA)
  • Harvesting Machines For Specific Crops (AREA)
  • Toys (AREA)

Claims (10)

  1. Bateau à réaction (1) ayant une coque (2) munie d'un pont (3) portant un siège surélevé (9) s'étendant vers l'avant de la poupe (8), et à l'avant de celui-ci, un cockpit de commande (12) situé au voisinage du centre longitudinal du bateau, et des cale-pieds (18,19) s'ouvrant vers la poupe (8) et disposés de part et d'autre dudit siège (9),
    caractérisé en ce que
    lesdits cale-pieds (18, 19) rejoignent une zone formant gouttière (16) de la partie avant du pont et s'étendant à l'avant du cockpit de commande (12) pour former une zone évidée continue sur le pont (3) en association avec les cale-pieds (18, 19), et en ce qu'un corps transversal (20) est disposé en travers des cale-pieds (18, 19) au voisinage des extrémités arrière de ces derniers mais espacés de la poupe (8) du bateau (1), la hauteur du corps transversal par rapport au fond du cale-pied empêchant toute arrivée d'eau par la poupe (8) lorsque le bateau est au repos ou dérive, mais permettant l'évacuation de l'eau hors des cale-pieds (18, 19) lorsque le bateau se déplace, entraîné par un système de propulsion à jet (4) classique.
  2. Bateau à réaction selon la revendication 1, caractérisé en ce que ledit corps transversal (20) comprend une chicane transversale formant une marche.
  3. Bateau à réaction selon la revendication 1 ou 2, caractérisé en ce que ledit corps transversal est réalisé sous la forme d'une rampe (28) s'élevant vers la poupe.
  4. Bateau à réaction (1) ayant une coque (2) munie d'un pont (3) portant un siège surélevé (9) s'étendant vers l'avant de la poupe (8), et à l'avant de celui-ci, un cockpit de commande (12) situé au voisinage du centre longitudinal du bateau, et des cale-pieds (18, 19) s'ouvrant vers la poupe (8) et disposés de part et d'autre dudit siège (9), en particulier, selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ledit corps transversal (26) est de nature compressible élastiquement.
  5. Bateau à réaction selon l'une quelconque des revendications 1 à 4, caractérisé en ce que ledit corps transversal est réalisé sous la forme d'un soufflet tubulaire élastique en caoutchouc (26).
  6. Bateau à réaction selon l'une quelconque des revendications 1 à 5, caractérisé en ce que ledit corps transversal est réalisé sous la forme d'un volet flottant (28) monté sur ledit pont (3) pour pivoter autour d'un axe transversal horizontal avant (27).
  7. Bateau à réaction selon la revendication 6 , caractérisé en ce que la position d'extrémité arrière de chaque cale-pied (18, 19) est façonnée de manière à présenter un évidement (30) dont la section transversale est de forme triangulaire, avec une paroi de séparation orientée vers la poupe, ledit volet (28) ayant également une section transversale de forme triangulaire et étant monté de manière à ce que l'un de ses bords pivote autour dudit axe transversal horizontal (27) afin que ledit volet (28) puisse pratiquement s'emboîter dans ledit évidement (30), le fond de cet évidement (30) étant muni d'un orifice d'évacuation.
  8. Bateau à réaction selon la revendication 7 , caractérisé en ce que ledit orifice d'évacuation dudit évidement (30) communique avec une canalisation d'évacuation (31) s'ouvrant vers la poupe, sous la ligne de flottaison (f) de la coque.
  9. Bateau à réaction selon l'une quelconque des revendications 1 à 8, caractérisé en ce que deux corps transversaux (20) partent d'une zone centrale surélevée du bateau servant de support au siège (9), vers la périphérie extérieure surélevée du bateau (1).
  10. Bateau à réaction selon l'une quelconque des revendications 1 à 9, caractérisé en ce qu'un moyen pour le passage d'eau (30, 31) au travers du corps transversal (20) est prévu et comporte un moyen à clapet anti-retour à une voie (18) pour laisser passer l'eau des cale-pieds (18, 19) vers l'arrière et pardessus la poupe (8), mais pas en sens opposé.
EP88113521A 1987-08-28 1988-08-19 Bateau à réaction Expired - Lifetime EP0304821B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP62213010A JP2676345B2 (ja) 1987-08-28 1987-08-28 小型滑走艇
JP213010/87 1987-08-28
JP220392/87 1987-09-04
JP62220392A JP2666139B2 (ja) 1987-09-04 1987-09-04 小型滑走艇

Publications (2)

Publication Number Publication Date
EP0304821A1 EP0304821A1 (fr) 1989-03-01
EP0304821B1 true EP0304821B1 (fr) 1993-08-04

Family

ID=26519571

Family Applications (2)

Application Number Title Priority Date Filing Date
EP88113521A Expired - Lifetime EP0304821B1 (fr) 1987-08-28 1988-08-19 Bateau à réaction
EP88113522A Expired - Lifetime EP0304822B1 (fr) 1987-08-28 1988-08-19 Bateau à réaction

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP88113522A Expired - Lifetime EP0304822B1 (fr) 1987-08-28 1988-08-19 Bateau à réaction

Country Status (2)

Country Link
EP (2) EP0304821B1 (fr)
ES (2) ES2039532T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02128696U (fr) * 1988-03-09 1990-10-23
US5036789A (en) * 1990-03-01 1991-08-06 Kelly Roy T Jet ski hull and method of manufacture
FR2664229B1 (fr) * 1990-07-06 1995-07-07 Zodiac Int Embarcation, notamment a propulsion par jet d'eau, equipee d'une carene rigide profilee a l'arriere.
GB9905427D0 (en) 1999-03-09 1999-05-05 Duncan Ian J Hull for high speed water craft

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB325852A (en) * 1928-11-30 1930-02-28 Hubert Scott Paine Improvements in or relating to under-water fittings for motor boats
GB1121031A (en) * 1966-03-01 1968-07-24 Timothy James Bedford Improvements relating to planing water craft
US3790977A (en) * 1972-01-24 1974-02-12 Germain Bombardier Hull construction for watercraft
DE2222613A1 (de) * 1972-05-09 1973-11-22 Kurt Bier Lenzventil mit rueckschlagklappe fuer sportsegelboote
US4128072A (en) * 1977-03-21 1978-12-05 Woodstream Corporation Power boat hull
JPS55142395U (fr) * 1979-03-29 1980-10-11
JPS61257389A (ja) * 1985-05-08 1986-11-14 Kawasaki Heavy Ind Ltd 小型滑走艇

Also Published As

Publication number Publication date
ES2043747T3 (es) 1994-01-01
EP0304822A1 (fr) 1989-03-01
ES2039532T3 (es) 1993-10-01
EP0304822B1 (fr) 1993-03-03
EP0304821A1 (fr) 1989-03-01

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