US3620019A - Jet propulsion drive for watercraft - Google Patents

Jet propulsion drive for watercraft Download PDF

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Publication number
US3620019A
US3620019A US884796A US3620019DA US3620019A US 3620019 A US3620019 A US 3620019A US 884796 A US884796 A US 884796A US 3620019D A US3620019D A US 3620019DA US 3620019 A US3620019 A US 3620019A
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United States
Prior art keywords
housing
watercraft
water
vane
drive
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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
US884796A
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English (en)
Inventor
Harm-Heinrich Munte
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.)
Blohm and Voss GmbH
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Blohm and Voss GmbH
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Filing date
Publication date
Application filed by Blohm and Voss GmbH filed Critical Blohm and Voss GmbH
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Publication of US3620019A publication Critical patent/US3620019A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
    • B63H11/06—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of reciprocating type

Definitions

  • An upright housing is provided at the rear end of a watercraft and has a cross-sectional outline resembling a symmetrical trapezium.
  • the narrowest side of the housing faces oppositely the intended movement of the watercraft and a pair of sidewalls extend from the narrowest side in the direction of intended movement.
  • Inlet means are provided for admitting water into the housing and outlet means are in the narrowest side for expelling water from the housing.
  • An expello vane is mounted in the housing for pivotal movement intermediate the respective side walls about an upright axis extending through the housing in the region of the outlet means.
  • the present invention relates to watercraft, and more particularly to propulsion drive for watercraft. More specifically, the invention relates to a jet propulsion drive for watercraft.
  • jet propulsion drive for watercraft, which drives are located at the rear or stern and which comprises housings into which water is caused to enter to thereupon be expelled in the direction oppositely the intended forward movement of the watercraft.
  • the expulsion of jets or streams of water from the housing is effected by means of the moving vane mounted in the interior of the housing and causing, as it moves within the housing, the displacement of Water from the housing and its expulsion in form of a stream of water.
  • the stream depends upon the motion frequency and is intermittent, having a thrust dependent upon the quantity of water expelled per unit of time and the increase in the speed imparted to the thus-expelled water.
  • these known drives are satisfactory in their operation. It has been found, however, that they cannot be entirely satisfactorily mounted on the watercraft themselves because of various reasons which are well known to those skilled in the art.
  • a further object of the invention is to provide such a drive which provides for improved water inlet and expulsion conditions.
  • a jet propulsion drive for watercraft which, briefly stated, comprises an upright housing whose cross-sectional outline resembles a symmetrical trapezium and which has a narrowest side facing in the direction oppositely the intended movement of the watercraft and a pair of sidewalls extend iice from the narrowest side in this direction of intended movement.
  • Inlet means is provided for admitting water into the housing and outlet means is provided in the narrowest side for expelling water from the housing.
  • An expeller vane is mounted in the housing for pivotal movement intermediate the respective side walls about an upright axis extending through the housing in the region of the outlet means.
  • the housing is essentially of prismatic configuration and because its cross-sectional outline, that is its base surface, has the form of a symmetric trapezium with the narrowest side facing oppositely the intended direction of the movement of the watercraft and containing the outlet for the water, with the pivot axis for the vane being located within the cross-sectional outlines of the housing close to the outlet opening, the housing conforms largely to the normal configuration of ships tail sections or sterns. Furthermore, the fiowpath or water from inlet to outlet can take place without significant deflections and an outlet opening is avoided whose size changes during the vane movement. All of this contributes to provide an exceptionally good operating efiiciency for this drive.
  • the housing converges in rearward direction, that is away from the direction of movement of the watercraft to which it is to be secured, which convergence of course is true of the interior as well as the exterior, the speed at which water is expelled from the outlet located at the narrowest side of the housing is greater than would otherwise be possible and is therefore excellently suited for high propulsion speeds.
  • the speed at which water issues from the outlet of the housing can be further increased by decreasing the cross-sectional area of the outlet opening, simply by having the outlet opening extend only over a portion of the cross-sectional area of the narrowest side of the housing, preferably over the middle portion of the narrowest side.
  • FIG. 1 is a diagrammatic illustration showing the principle of the drive according to the present invention
  • FIG. 2 is a section taken on the line IIII and illustrating an actual embodiment of the drive according to the present invnetion;
  • FIG. 3 is a section taken on the line III-III of FIG. 2;
  • FIG. 4 is a diagrammatic view of a Borda nozzle which may be used in conjunction with the present invention.
  • reference numeral 1 identifies a vane which pivots to and fro about an axis defined by the shaft 2 to which it is secured; and which latter is turned to and fro by a known drive arranged in the watercraft provided with the invention.
  • This axis is upright and the vane pivots within a housing whose interior is identified with reference numeral 3 and whose cross-sectional base outline is determined by the dimensions b-r with the height being identified by the dimension h.
  • FIGS. 2 and 3 An actual embodiment of the drive according to the present invention is illustrated in FIGS. 2 and 3.
  • the cross-sectional base outline of the housing 9-which latter is generally prismatic resembles a symmetrical trapezium whose narrowest isde 10 faces rearwardly with respect to the intended movement of a watercraft for which the device constitutes the propulsion means.
  • This means in other words, that for instance in FIG. 2 the direction of forward movement of the watercraft carrying and supplied with the drive of FIGS. 2 and 3, would be towards the right-hand side of the drawing.
  • the housing 9 is provided in its interior with a substantially plate-like vane 1 which is upright and moves pivotably about the upright shaft 2 defining a pivot axis.
  • the opposite side walls 8 of the housing which extend forwardly in the direction of intended movement from the narrowest side 10, are provided with apertures, with the aperatures in one of the side walls being controlled by valve flaps 7 and those in the other of the side walls being controlled by valve flaps 7". These flaps open inwardly into the housing to admit water in the direction indicated by the arrows when a suction exists in the chamber which is respectively defined between the vane 1 and the respective side wall 8.
  • a flap 5 is provided which, in the illustrated embodiment, freely pivots about the shaft 2 and which in FIG.
  • FIG. 4 shows such a nozzle in diagrammatic form, and it will be appreciated that this hydrodynamic valve, as it might be called, has no moving parts but is so configurated as to let water easily stream into the nozzle (downstream flow) and opposite it with only a very low drag coefiicient, while in the reverse direction (upstream flow) the water is checked by the very high drag coefiicient which is an inherent feature of tht nozzle configuration. Thus, water does not flow through in upstream direction.
  • a jet propulsion drive for watercraft comprising an upright housing whose cross-sectional outline resembles a symmetrical trapezium, and having a narrowest side facing in direction oppositely the intended movement of the watercraft and a pair of sidewalls extending from said narrowest side in the direction of intended movement; inlet means for admitting water into said housing; outlet means in said narrowest side for expelling Water from said housing; and an expeller vane mounted in said housing for pivvotal movement intermediate the respective side walls about an upright axis extending through said housing in the region of said outlet means.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Nozzles (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US884796A 1968-12-18 1969-12-15 Jet propulsion drive for watercraft Expired - Lifetime US3620019A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681815313 DE1815313B1 (de) 1968-12-18 1968-12-18 Strahlantrieb fuer Wasserfahrzeuge

Publications (1)

Publication Number Publication Date
US3620019A true US3620019A (en) 1971-11-16

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ID=5716548

Family Applications (1)

Application Number Title Priority Date Filing Date
US884796A Expired - Lifetime US3620019A (en) 1968-12-18 1969-12-15 Jet propulsion drive for watercraft

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US (1) US3620019A (de)
DE (1) DE1815313B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5123867A (en) * 1990-05-10 1992-06-23 Stefan Broinowski Marine jet propulsion unit
US5700170A (en) * 1995-12-08 1997-12-23 Mataya; Robert F. Variable diameter jet propulsion unit
US20090126612A1 (en) * 2007-11-21 2009-05-21 Hydreau Limited Waterwheel
US8651903B1 (en) * 2011-09-12 2014-02-18 Sudhir Pandit Hydro-propulsion apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10162328A1 (de) * 2001-12-18 2003-07-10 Helmut Obieglo Schiffsantrieb
DE10252406A1 (de) * 2002-11-12 2004-06-03 Ralf Hoffmann Antriebsvorrichtung für Wasserfahrzeuge

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE47175C (de) * H. PETERSEN in München, Schwanthalerstr. i8'/2 Flossenmotor
DE901992C (de) * 1951-06-24 1954-01-18 Hans Lichtenecker Flossenantrieb fuer Schiffe
FR1418806A (fr) * 1964-03-09 1965-11-26 Dispositif pour la propulsion ou le pompage d'un fluide et application de ce dispositif à la propulsion des navires

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5123867A (en) * 1990-05-10 1992-06-23 Stefan Broinowski Marine jet propulsion unit
US6027383A (en) * 1990-05-10 2000-02-22 Broinowski; Stefan Marine ducted propeller jet propulsion unit
US5700170A (en) * 1995-12-08 1997-12-23 Mataya; Robert F. Variable diameter jet propulsion unit
US20090126612A1 (en) * 2007-11-21 2009-05-21 Hydreau Limited Waterwheel
US8651903B1 (en) * 2011-09-12 2014-02-18 Sudhir Pandit Hydro-propulsion apparatus

Also Published As

Publication number Publication date
DE1815313B1 (de) 1970-08-20

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