US3624737A - Water-jet propulsion - Google Patents
Water-jet propulsion Download PDFInfo
- Publication number
- US3624737A US3624737A US884818A US3624737DA US3624737A US 3624737 A US3624737 A US 3624737A US 884818 A US884818 A US 884818A US 3624737D A US3624737D A US 3624737DA US 3624737 A US3624737 A US 3624737A
- Authority
- US
- United States
- Prior art keywords
- nozzle
- jet
- cowl
- air
- pipe
- 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
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Classifications
-
- 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
- B63H11/10—Marine propulsion by water jets the propulsive medium being ambient water having means for deflecting jet or influencing cross-section thereof
- B63H11/107—Direction control of propulsive fluid
- B63H11/113—Pivoted outlet
Definitions
- ABSTRACT An underwater jet propulsion nozzle includes means for injecting air into the jet stream issuing from the nozzle, to give increased thrust when stationary or at low speeds.
- the nozzle is mounted for swiveling movement on a fixed jet B63hl1/02 v pipe, and the plane of the swivel joint is inclined downwards in the direction of forward motion.
- WATER-JET PROPULSION This invention relates to jet propulsion units for boats. These units impart a propulsion force to the boat as a reaction to a water jet.
- Such propulsion units can be made very efficient, but it has been found that full thrust is not reached until the boat has gained some speed. This is particularly so where the jet nozzle is underwater.
- the invention comprises an underwater jet propulsion unit having an outlet water-jet nozzle including means to inject air into the jetstream as it issues from said nozzle.
- These means may consist of a tube projecting above the water level and feeding air to an annular cowl around the nozzle.
- a jet pipe is fixed to the stern of a boat (not shown) and extends rearwardly and downwardly to a swivel joint 11 by which it is connected to a curved underwater jet nozzle 12, which may be turned from the "forward drive” position shown in full lines to a reverse" position, shown dotted.
- the nozzle 12 ends in a short cylindrical section 13, which is surrounded by a cowl 14 forming an annular space 15 therewith.
- the rear edge 16 of the cowl l4 lies a small distance (say, 2 cm. or 1 cm.) beyond the outlet edge 17 of section 13.
- Space 15 is connected to pipe 18 (shown as a flexible tube) which extends above the water level 19 and is therefore open to the air.
- the water jet issuing from section 13 exerts suction on space 15 and draws air from it and from pipe 18, so that the jet is surrounded by an annular air envelope at least for a short distance beyond edges l6, 17. It is found that this provides full thrust from the jet stream even at low boat speed.
- the air injection may take various other forms.
- a short rigid pipe (corresponding to pipe 18) may project vertically up above water level 19. In this case, the pipe will lie under water in the reverse position, but this is not of much importance in some circumstances.
- cowl 13 may be dispensed with and air injected directly into the jet stream within nozzle 12. The air then adopts a generally annular relation to the jetstream and the same effects are produced.
- the invention is particularly useful in larger jet boats such as fishing trawlers or tugs where it is necessary to haul nets or other tows at low speed.
- An underwater jet propulsion unit having an outlet water jet nozzle, saidnonle being mounted for swiveling movement on a fixed jet pipe, the plane of the swivel joint being inclined downwards in the direction of forward motion whereby the nozzle may be swiveled for forward or reverse thrust, an annular cowl surrounding the discharge end of said nozzle and defining therewith an annular space, means to inject air into the jetstream as it issues from said nozzle comprising an air supply pipe communicating with said annular space between said cowl and said nonle, and an air control valve for regulating the airflow through said pipe thereby to provide full thrust even at low boat s ed.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Special Spraying Apparatus (AREA)
- Earth Drilling (AREA)
Abstract
An underwater jet propulsion nozzle includes means for injecting air into the jet stream issuing from the nozzle, to give increased thrust when stationary or at low speeds. The nozzle is mounted for swiveling movement on a fixed jet pipe, and the plane of the swivel joint is inclined downwards in the direction of forward motion.
Description
United States Patent [72] Inventor AlnllleE.A.Keller [50] FieldoiSearch....................;......................ll5/l2,ll. 37 Bourbond St., lndooroopllly, Brisbane, l4, 16; 60/221, 231; 239/265.l9
' Man U W U 1 S m m m m m N m m T 0 mum mnm m m T n n m M SfiM C um nmc m N w 6 m U w m w Ill." 692m a 785mm 920 3" 1 mm m l. 333D. A wn 9 9 Ma las I mmuwwmm no Qmmumnu 0 mm mmmm AHPP N HM P DUHDUU Attorney-Oberlin, Maky, Donnelly & Renner [54] WATER-JETPROPULSION 2 Clalna, 1 Drawing Fig.
ABSTRACT: An underwater jet propulsion nozzle includes means for injecting air into the jet stream issuing from the nozzle, to give increased thrust when stationary or at low speeds.
ll- CL................................................. The nozzle is mounted for swiveling movement on a fixed jet B63hl1/02 v pipe, and the plane of the swivel joint is inclined downwards in the direction of forward motion.
WATER-JET PROPULSION This invention relates to jet propulsion units for boats. These units impart a propulsion force to the boat as a reaction to a water jet.
Such propulsion units can be made very efficient, but it has been found that full thrust is not reached until the boat has gained some speed. This is particularly so where the jet nozzle is underwater.
It is an object of this invention to overcome with underwater jets.
Accordingly, the invention comprises an underwater jet propulsion unit having an outlet water-jet nozzle including means to inject air into the jetstream as it issues from said nozzle.
These means may consist of a tube projecting above the water level and feeding air to an annular cowl around the nozzle.
An exemplary embodiment will now be described with reference to the accompanying drawing, which shows in section a jet nozzle of reversible type.
A jet pipe is fixed to the stern of a boat (not shown) and extends rearwardly and downwardly to a swivel joint 11 by which it is connected to a curved underwater jet nozzle 12, which may be turned from the "forward drive" position shown in full lines to a reverse" position, shown dotted.
The nozzle 12 ends in a short cylindrical section 13, which is surrounded by a cowl 14 forming an annular space 15 therewith.
The rear edge 16 of the cowl l4 lies a small distance (say, 2 cm. or 1 cm.) beyond the outlet edge 17 of section 13.
In operation, the water jet issuing from section 13 exerts suction on space 15 and draws air from it and from pipe 18, so that the jet is surrounded by an annular air envelope at least for a short distance beyond edges l6, 17. It is found that this provides full thrust from the jet stream even at low boat speed.
this difficulty The Provision of an air control valve 20 at a convenient position will demonstrate this, as well as enabling the amount of air admitted to be regulated. lf valve 20 is turned off, lowspeed thrust drops considerably to rise quickly as valve 20 is turned on.
With ample air available from pipe 18, the arrangement is to a large extent self-regulating. As the jet speed increases, more air is drawn in and close to optimum conditions occur.
The air injection may take various other forms. For example, a short rigid pipe (corresponding to pipe 18) may project vertically up above water level 19. In this case, the pipe will lie under water in the reverse position, but this is not of much importance in some circumstances.
Alternatively, the cowl 13 may be dispensed with and air injected directly into the jet stream within nozzle 12. The air then adopts a generally annular relation to the jetstream and the same effects are produced.
The invention is particularly useful in larger jet boats such as fishing trawlers or tugs where it is necessary to haul nets or other tows at low speed.
Various other changes and modifications may be made in the arrangements described without departing from the invention claimed.
What I claim is:
1. An underwater jet propulsion unit having an outlet water jet nozzle, saidnonle being mounted for swiveling movement on a fixed jet pipe, the plane of the swivel joint being inclined downwards in the direction of forward motion whereby the nozzle may be swiveled for forward or reverse thrust, an annular cowl surrounding the discharge end of said nozzle and defining therewith an annular space, means to inject air into the jetstream as it issues from said nozzle comprising an air supply pipe communicating with said annular space between said cowl and said nonle, and an air control valve for regulating the airflow through said pipe thereby to provide full thrust even at low boat s ed.
2. The unit of c aim wherein said cowl projects beyond the outlet edge of said nozzle.
t O t i i
Claims (2)
1. An underwater jet propulsion unit having an outlet water-jet nozzle, said nozzle being mounted for swiveling movement on a fixed jet pipe, the plane of the swivel joint being inclined downwards in the direction of forward motion whereby the nozzle may be swiveled for forward or reverse thrust, an annular cowl surrounding the discharge end of said nozzle and defining therewith an annular space, means to inject air into the jetstream as it issues from said nozzle comprising an air supply pipe communicating with said annular space between said cowl and said nozzle, and an air control valve for regulating the airflow through said pipe thereby to provide full thrust even at low boat speed.
2. The unit of claim 1 wherein said cowl projects beyond the outlet edge of said nozzle.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU48106/68A AU4810668A (en) | 1968-12-19 | 1968-12-19 | Water-jet propulsion |
Publications (1)
Publication Number | Publication Date |
---|---|
US3624737A true US3624737A (en) | 1971-11-30 |
Family
ID=3734892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US884818A Expired - Lifetime US3624737A (en) | 1968-12-19 | 1969-12-15 | Water-jet propulsion |
Country Status (3)
Country | Link |
---|---|
US (1) | US3624737A (en) |
AU (1) | AU4810668A (en) |
GB (1) | GB1271870A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2228661A1 (en) * | 1973-05-08 | 1974-12-06 | Stockmann Walter | |
US3877408A (en) * | 1971-06-28 | 1975-04-15 | Wyly Kenneth Crowder | Aquatic vehicles |
DE3009671A1 (en) * | 1980-03-13 | 1981-09-24 | Schottel-Werft Josef Becker Gmbh & Co Kg, 5401 Spay | WATERJET DRIVE DEVICE FOR DRIVING WATER VEHICLES |
US4304558A (en) * | 1979-06-28 | 1981-12-08 | Outboard Marine Corporation | Marine propulsion device including propeller shroud |
US4552537A (en) * | 1979-06-20 | 1985-11-12 | Haynes Hendrick W | Marine propulsion device with engine heat recovery system and streamlining hull closures |
US4824409A (en) * | 1985-11-26 | 1989-04-25 | Yamaha Hatsudoki Kabushiki Kaisha | Marine vessel with internal combustion engine having an exhaust pipe. |
US5064392A (en) * | 1990-09-24 | 1991-11-12 | Scott Wonders | Self-propelled floatable fire nozzle |
US5123867A (en) * | 1990-05-10 | 1992-06-23 | Stefan Broinowski | Marine jet propulsion unit |
US5222863A (en) * | 1991-09-03 | 1993-06-29 | Jones Brian L | Turbine multisection hydrojet drive |
US6109663A (en) * | 1997-12-03 | 2000-08-29 | Rolls-Royce, Plc | Joint seal for a gas turbine engine exhaust duct |
US6165029A (en) * | 1999-07-06 | 2000-12-26 | Lu; Hsueh-Liang | Pedal boat |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2484953A1 (en) * | 1979-10-08 | 1981-12-24 | Huret Bernard | COMBINED WATER JET EJECTION AND ORIENTATION DEVICE FOR PROPULSION OF A VESSEL |
FR2623161B1 (en) * | 1987-11-16 | 1990-04-06 | Moteur Moderne Le | VESSEL PROVIDED WITH AT LEAST ONE REACTION PROPELLER |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3188997A (en) * | 1963-11-27 | 1965-06-15 | Willard R Christensen | Marine propulsion system |
US3206928A (en) * | 1962-05-16 | 1965-09-21 | Moore Products Co | Boat steering apparatus |
US3302605A (en) * | 1964-02-14 | 1967-02-07 | Tamco Ltd | Water jet propulsion apparatus |
-
1968
- 1968-12-19 AU AU48106/68A patent/AU4810668A/en not_active Expired
-
1969
- 1969-12-15 US US884818A patent/US3624737A/en not_active Expired - Lifetime
- 1969-12-17 GB GB61430/69A patent/GB1271870A/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3206928A (en) * | 1962-05-16 | 1965-09-21 | Moore Products Co | Boat steering apparatus |
US3188997A (en) * | 1963-11-27 | 1965-06-15 | Willard R Christensen | Marine propulsion system |
US3302605A (en) * | 1964-02-14 | 1967-02-07 | Tamco Ltd | Water jet propulsion apparatus |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3877408A (en) * | 1971-06-28 | 1975-04-15 | Wyly Kenneth Crowder | Aquatic vehicles |
FR2228661A1 (en) * | 1973-05-08 | 1974-12-06 | Stockmann Walter | |
US4552537A (en) * | 1979-06-20 | 1985-11-12 | Haynes Hendrick W | Marine propulsion device with engine heat recovery system and streamlining hull closures |
US4304558A (en) * | 1979-06-28 | 1981-12-08 | Outboard Marine Corporation | Marine propulsion device including propeller shroud |
DE3009671A1 (en) * | 1980-03-13 | 1981-09-24 | Schottel-Werft Josef Becker Gmbh & Co Kg, 5401 Spay | WATERJET DRIVE DEVICE FOR DRIVING WATER VEHICLES |
US4411630A (en) * | 1980-03-13 | 1983-10-25 | Schottel-Werft, Josef Becker Gmbh & Co Kg. | Water-jet drive mechanism for the driving of watercraft |
US4824409A (en) * | 1985-11-26 | 1989-04-25 | Yamaha Hatsudoki Kabushiki Kaisha | Marine vessel with internal combustion engine having an exhaust pipe. |
USRE33488E (en) * | 1985-11-26 | 1990-12-11 | Yamaha Hatsudoki Kabushiki Kaisha | Marine vessel with internal combustion engine having an exhaust pipe |
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 |
US5064392A (en) * | 1990-09-24 | 1991-11-12 | Scott Wonders | Self-propelled floatable fire nozzle |
US5222863A (en) * | 1991-09-03 | 1993-06-29 | Jones Brian L | Turbine multisection hydrojet drive |
US6109663A (en) * | 1997-12-03 | 2000-08-29 | Rolls-Royce, Plc | Joint seal for a gas turbine engine exhaust duct |
US6165029A (en) * | 1999-07-06 | 2000-12-26 | Lu; Hsueh-Liang | Pedal boat |
Also Published As
Publication number | Publication date |
---|---|
AU4810668A (en) | 1971-06-17 |
GB1271870A (en) | 1972-04-26 |
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