EP0502835A1 - Appareil de propulsion pour navires et procédé pour la fabrication de cet appareil - Google Patents

Appareil de propulsion pour navires et procédé pour la fabrication de cet appareil Download PDF

Info

Publication number
EP0502835A1
EP0502835A1 EP92850048A EP92850048A EP0502835A1 EP 0502835 A1 EP0502835 A1 EP 0502835A1 EP 92850048 A EP92850048 A EP 92850048A EP 92850048 A EP92850048 A EP 92850048A EP 0502835 A1 EP0502835 A1 EP 0502835A1
Authority
EP
European Patent Office
Prior art keywords
subwater
drive body
superwater
propeller
boat
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.)
Withdrawn
Application number
EP92850048A
Other languages
German (de)
English (en)
Inventor
Hans Thiger
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 EP0502835A1 publication Critical patent/EP0502835A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/32—Other parts
    • B63H23/36—Shaft tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B63H1/18—Propellers with means for diminishing cavitation, e.g. supercavitation
    • B63H2001/185—Surfacing propellers, i.e. propellers specially adapted for operation at the water surface, with blades incompletely submerged, or piercing the water surface from above in the course of each revolution

Definitions

  • the present invention relates to a propulsion apparatus for high speed, planing marine craft, and more particularly the invention relates to such a propulsion apparatus which is adapted to be used in combination with surface water driving propellers, by which is meant a propeller for large size, high speed marine craft, and which propeller while driving the boat at high speed dips into the water with only a little portion thereof, for instance with 30-50% thereof, whereas the remaining part of the propeller runs in the air above the water level.
  • a propulsion apparatus of this type are known, for instance by the so called "Arneson-drive” which is shown in the European patent EP-A-37.690 and which comprises a drive body having a substantially circular cross section and a diameter which decreases in the direction towards the propeller, and in which the drive body via a ball joint is connected to a mounting means at the transom of the boat, and which is stablized by a pair of steering cylinders and a tilt cylinder.
  • Marine propulsion drives having surface driving propellers and formed for being steered and for being tilted in the vertical direction are complicateed and expensive, and they mostly have a drive body shape which is not ideal from water flow viewpoint, for instance since the shape of the drive body is at least to some extent necessarily adapted to the mounting means at the boat's stern and to the steering and tilting means.
  • the inventions is based on the idea of providing a fixed type of marine propulsion apparatus having a surface driving propeller, in other words a marine propulsing apparatus not having any steering of tilting facilities for the drive body.
  • the drive body of a fixed propulsion apparatus can be made more stable than the apparatus having steering and tilting means; for many purposes conventional, separate steering means in the form of rudders mounted in the boat hull are both cheaper and more easy to handle and maintain than steerable drives; at least in the open see a boat can be easier to manage by means of such separate rudder systems; it is possible to form the fixed drive body with a profile which from water flow viewpoint is improved or nearly ideal since it is not necessary to consider any steering and tilting means in the design of the drive body; it is easier to mount the drive body at the boat hull; and the connection of the drive to the drive engines can be made by means of simple, straight and stably beared shafts, etc.
  • the object of the invention is to solve at least the majority of the above mentioned problems and lacks of the previously known propulsion apparatus of the above mentioned type having surface water driving propellers, and the invention is intended to provide a marine propulsion apparatus of a fixed type, that is a non-steerable and non-tiltable type, which is designed to give the flow of passing water an optimum good, laminary flow without the waste of turbulence and cavitation.
  • the optimum shape of a body which is moving at high speed in the water is supposed to be an acute or arrow-like shape having the point of the body in the moving direction of the marine craft.
  • a drive body of said known type can not be formed conically widened towards the propeller like an arrow, since in such case the entire drive body should be too weak, and in front of all the mounting surface of the drive body at the stern of the marine craft should bee too little and too weak.
  • Basis of the invention therefore is the idea of formning only the part of the drive body which at high speed is dipped into the water with a spool-shaped surface which is conically widened towards the propeller, like the stem of a canoe, and to form the remaining parts of the drive body, which parts are at high speed driving located above the water with an inversely widened drive body surface, meaning a drive body portion which is tapering towards the propeller.
  • a drive body having such a combined drive body shape is advantageous in providing a canoe-like subwater-body part providing a laminary water flow along the water dipped part of the drive, and a large and stable superwater body part above the water surface and a large mounting surface for the drive body at the stern of the boat.
  • the object of the invention also has been to solve the problem of manufacturing a drive body having said complicated shape comprising a subwater body portion converging in the moving direction of the boat and of the drive and a superwater body portion which is diverging is same direction.
  • this object is fulfilled by means of two specially formed pieces of plates, whereby both plates are fold to a round form and are joined edge to edge to each other by means of a substantially longitudinal joint.
  • the joining preferably is made by welding but alternatively the plates can be joined by rivetting.
  • the substantially longitudinal joint between the subwater and superwater portions of the drive body provides a concave fold or flute at opposite sides of the drive body, which flutes, in an ideally designed drive body, form a type of water guiding groove or channel along which the water is guided in a laminary flow along the drive body towards the center and slightly below the center of the propeller.
  • figure 1 shows a propulsion apparatus according to the invention seen from above and from the end thereof which is to be mounted at the boat.
  • the drive shaft is excluded in figure 1.
  • Figure 2 shows the apparatus of figure 1 straight from above.
  • Figure 3 diagrammatically shows a vertical cross section through the rear part of a boat equipped with the propulsion apparatus according to the invention.
  • Figure 4 shows a boat having a twin arrangment of propulsion apparatus as seen from behind the boat,
  • figure 5 is a perspective view from behind and from underneath the same boat, and figure 6 shows the same boat straight from underneath.
  • Figure 7 diagrammatically illustrates the angles of the drive body and the stern of the boat, "alfa", “beta”, “gamma”, which are of great importance for the good function of the propulsion apparatus.
  • Figure 8 shows a ready punched out plate for the manufacture of the "superwater” part of the drive body
  • figure 9 shows a ready punched out plate for the manufacture of the "subwater” part of the drive body
  • figure 10 diagrammatically shows how the plates of figures 8 and 9 are being formed and joined to a combined drive body.
  • the propulsion apparatus shown in the drawings comprises a composed drive body 1 having means, prefably a mounting ring 2 for mounting of the propulsion apparatus on a inclined stern of a boat, and at the opposite end of the drive body there is a propeller means.
  • the drive body 1 is composed of two different parts, in the following referred to as the "superwater” body 4 and the “subwater” body 5, named considering the fact that the two parts 4 and 5 upon driving the boat at high speed, meaning a speed which is substantially higher than the so called planing limit dprrf, mainly lie above and under the water surface respectively.
  • the entire propulsion apparatus is under water.
  • both the superwater body 4 and the subwater body 5 are made from a flat, punched out plate blank of for instance stainless steel or aluminum.
  • the plate blanks are illustrated in figure 8 and 9 respectively.
  • the plate blank for the superwater body 4 has a shape which is similar to a boomerang, which is symmetrical about a central longitudinal axis 6 and which has the convexly bowformed boomerang point facing the propeller.
  • the boomerang wings end in points 7 which form the lowermost part 7-7 of the drive body adjacent the mounting ring and which in the ready drive body are joined meeting point 7 to point 7.
  • the mainly concave plate edge 8 between the wing points 7 is shaped to form an even surface in the ready drive body, against which surface the mounting ring 2 can be welded, whereby the mounting ring will be inclined a certain angle corresponding to a calculated best mounting angle, "gamma"of figure 7, at the stern of the boat.
  • the mainly convex edge 9 of the superwater body part 4 sweeps from the lowermost part 7-7 backwards-uppwards and thereafter downwards-forwards round the entire drive body and ends at the points 7-7.
  • the plate blank for the subwater body part 5 which is likewise symmetrical about a central longitudinal axis 10 forms a convex point 11 adapted to be joined to the front-bottom end part 7-7 of the superwater body 4, and from said point 11 the blank has two diverging edges 12 and a T-shaped transversal rear end 13 adapted to form a substantially cylindrical mounting means 14 for the propeller housing 15.
  • the edges 12 of the subwater body part 5 are joined, preferably welded, to the edges 9 of the superwater body 4, and the transversal end parts 13 are weld connected edge to edge at the top of the drive body.
  • the drive body part thereby formed provides a subwater body 5 which, as seen rearwardly from the boat stern, is diverging like the stem of a canoe, especially so that each point along the subwater body forms a tangent "alfa" (see figure 7) to the longitudinal direction of the drive body which is 0-4° or preferably 1-2°, corresponding to a diverging angle, as seen in the flow direction of the water of up to 8° or preferable 2-4°.
  • the superwater body part 4 of the drive body is, contrary to the subwater body part 5, converging in the direction towards the propeller 3.
  • the superwater body part 4 may form an angle "beta” (see figure 7) to the central axis of the drive body of about 5-10° or preferably 7-8°, corresponding to a convergence angle, as seen in the flow direction of the water, of 10-20° or preferably 14-16°.
  • the stern of the boat is significantly slowly inclined, and it may form an angle "gamma" of 20-30° to the bottom of the boat, which bottom plane, at full speed driving - over planing speed - is supposed to be identical to the horizontal plane. In the case illustrated in figure 3 said angle "gamma" is about 25°, but this is not a critical angle.
  • Figures 4-7 show that the boat preferably has some overhang.
  • Figure 4 illustrates a twin mounting in which the two propulsion apparatus are mounted so close to the the V-shaped bottom 16 of the boat that one or two of the shown five propeller blades dip into the water when the boat is driven at a speed over the planing speed, whereas the remaining 4-3 propeller blades appear in the air above the water surface.
  • the mounting ring 2 for the drive body should have such an angle in relation to the stern 17 of the boat, that the bottom edge of the subwater body 5 and the above mentioned parts of the superwater body form an angle downwards "alfa" of 0-4° or preferably 1-2° in relation to the water surface.
  • a larger angle than 4° gives,or at least tends to give, a turbulent water flow, and a negative angle, in turn, gives a too little dipping of the propeller blades into the water.
  • the mounting ring 2 can be screwed of bolted directly to the stern 17 of the boat, and this gives a stable and safe mounting thereof.
  • the propulsion apparatus is connected to a drive-engine, for to instance a gas turbine 18 having an assisting diesel engine 19, over a straight shaft 20 which can be very stably beared on several places of the boat.
  • Figure 3 also shows how the boat can be formed with a conventionsl rudder 21 having a separate steering means.
  • the propeller is of a known type having propeller blades 22 which are warpable for front and rear driving of boat and which are specially adapted to surface water driving conditions, and which for this purpose are much larger than convention subwater propeller blades and have a shape and pitch which significantly differ from those of said conventional propeller blades.
  • FIG 10 diagramatically illustrates how a propulsion apparatus is manufactured.
  • the boomerang-like plate for the superwater body 4 is placed with the rounded boomerang point facing the propeller 3, and the plate for the subwater body 5 is placed with the point 11 thereof facing the mounting means 2.
  • the folding round of the superwater plate 4 starts from the lower point 7 at the underside of the drive body, whereas the folding round of the subwater body 5 starts at the upper part thereof located closest to the propeller means 3. It is of course possible to start the folding round of the plates at other points of the drive body.
  • the superwater plate 4 is now folded up, round the upper side of the drive body and down again on the opposite side of the drive body, so that the points 7-7 meet each other.
  • the subwater plate 5 on the contrary, is fold down, round the underside of the drive body and up again, so that the transversal ends 13-13 form a butt joint.
  • the drive body parts now are welded together along the edges 9 and 12 and along the meeting edges of the transversal ends 13-13.
  • the propeller housing 15 is thereafter put into place and is weld connected to the drive body, and a mounting ring 2 is welded to the end of the drive body to be mounted at the stern of the boat.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Revetment (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Gears, Cams (AREA)
  • Arc Welding In General (AREA)
EP92850048A 1991-03-05 1992-03-05 Appareil de propulsion pour navires et procédé pour la fabrication de cet appareil Withdrawn EP0502835A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9100641 1991-03-05
SE9100641A SE466544B (sv) 1991-03-05 1991-03-05 Framdrivningsanordning foer vattenfarkoster samt foerfarande foer tillverkning av saadan anordning

Publications (1)

Publication Number Publication Date
EP0502835A1 true EP0502835A1 (fr) 1992-09-09

Family

ID=20382058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92850048A Withdrawn EP0502835A1 (fr) 1991-03-05 1992-03-05 Appareil de propulsion pour navires et procédé pour la fabrication de cet appareil

Country Status (2)

Country Link
EP (1) EP0502835A1 (fr)
SE (1) SE466544B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994025342A1 (fr) * 1993-04-30 1994-11-10 Robert Arthur Blakemore Enveloppe de l'arbre d'entrainement d'un bateau
CN108482613A (zh) * 2018-04-18 2018-09-04 苏州东珠龙旺消防器材有限公司 一种可远程遣派救援的救生浮艇

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB389643A (en) * 1932-02-26 1933-03-23 Evert Van Der Molen Improvements in or relating to screw propellers
FR2431424A1 (fr) * 1978-07-18 1980-02-15 Hurth Masch Zahnrad Carl Dispositif propulseur pour bateau muni d'une helice de surface

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB389643A (en) * 1932-02-26 1933-03-23 Evert Van Der Molen Improvements in or relating to screw propellers
FR2431424A1 (fr) * 1978-07-18 1980-02-15 Hurth Masch Zahnrad Carl Dispositif propulseur pour bateau muni d'une helice de surface

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994025342A1 (fr) * 1993-04-30 1994-11-10 Robert Arthur Blakemore Enveloppe de l'arbre d'entrainement d'un bateau
CN108482613A (zh) * 2018-04-18 2018-09-04 苏州东珠龙旺消防器材有限公司 一种可远程遣派救援的救生浮艇
CN108482613B (zh) * 2018-04-18 2023-08-29 苏州东珠龙旺消防器材有限公司 一种可远程遣派救援的救生浮艇

Also Published As

Publication number Publication date
SE9100641D0 (sv) 1991-03-05
SE9100641L (sv) 1992-03-02
SE466544B (sv) 1992-03-02

Similar Documents

Publication Publication Date Title
US6623320B1 (en) Drive means in a boat
US3793980A (en) Marine propulsion system
US6705907B1 (en) Drive means in a boat
WO1989008045A1 (fr) Entrainement marin de surface equilibre
US6014940A (en) Surface effect craft
WO1997046445A1 (fr) Unite marine de propulsion et de gouvernail
CA1039587A (fr) Coque de type hydroplane
US20080127874A1 (en) Hybrid boat hull
US4557211A (en) Form stabilized low water plane area twin hull vessels
US5063868A (en) Boat hull for V-bottom powerboats
EP2259963B1 (fr) Procédé pour équiper un navire d'une hélice à grand diamètre et navire équipé d'une hélice à grand diamètre
US3991696A (en) Hull of a small-sized ship
US4959032A (en) Water craft with guide fins
EP0502835A1 (fr) Appareil de propulsion pour navires et procédé pour la fabrication de cet appareil
US4843989A (en) Ship's hull for small vessels and high speeds
US3628485A (en) Planing boat with stepped hull
US5526764A (en) Surface effect craft
US3207118A (en) Boat propulsion system
US5313906A (en) Small waterplane twin hull vessel
US5231947A (en) Ship's rudder
GB2248433A (en) Surface propeller located aft of transom by distance in the range 35% to 80% of propeller diameter
US5141456A (en) Water craft with guide fins
US5772481A (en) Skeg construction for a marine propulsion unit
US6155894A (en) Off-center marine outboard skeg
US4269135A (en) Hydroplanes

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB

17P Request for examination filed

Effective date: 19930309

17Q First examination report despatched

Effective date: 19940706

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19940930