US20090130927A1 - Kort nozzle - Google Patents

Kort nozzle Download PDF

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Publication number
US20090130927A1
US20090130927A1 US12/069,171 US6917108A US2009130927A1 US 20090130927 A1 US20090130927 A1 US 20090130927A1 US 6917108 A US6917108 A US 6917108A US 2009130927 A1 US2009130927 A1 US 2009130927A1
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United States
Prior art keywords
kort nozzle
openings
kort
nozzle according
respect
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
US12/069,171
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English (en)
Inventor
Mathias Kluge
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.)
Becker Marine Systems GmbH and Co KG
Original Assignee
Becker Marine Systems GmbH and Co KG
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 Becker Marine Systems GmbH and Co KG filed Critical Becker Marine Systems GmbH and Co KG
Assigned to BECKER MARINE SYSTEMS GMBH & CO. KG reassignment BECKER MARINE SYSTEMS GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KLUGE, MATHIAS
Publication of US20090130927A1 publication Critical patent/US20090130927A1/en
Priority to US12/838,994 priority Critical patent/US8246401B2/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • 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
    • B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/42—Steering or dynamic anchoring by propulsive elements; Steering or dynamic anchoring by propellers used therefor only; Steering or dynamic anchoring by rudders carrying propellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/46—Steering or dynamic anchoring by jets or by rudders carrying jets

Definitions

  • the present invention relates to a Kort nozzle, in particular a Kort nozzle which is configured rotatable about the rudder axis of a ship.
  • a Kort nozzle is a conically tapered tube in which the propeller of a ship is placed.
  • the tube also forms the wall of the Kort nozzle. Due to the taper of the tube to the stern of the ship, the Kort nozzles can transmit an additional thrust to the ship without the output having to be increased. Besides the propulsion improving properties of the Kort nozzle, pitching by rough sea is thus reduced so that by sea disturbance the loss of velocity can be reduced and the directional stability can be increased. Since the inherent resistance of the Kort nozzle increases approximatively quadratically as the speed of the ship increases, its advantages are effective in particular for slow ships which have a big propeller thrust (for example tugboats, fishing vehicles, etc.).
  • Kort rudder nozzles for which the Kort nozzle is rotatable about the rudder axis of the ship which is in vertical direction.
  • bearings are normally provided on the upper and lower side of the Kort nozzle on the outside of its wall for the rotatable positioning.
  • the propeller is still fixed so that the Kort nozzle also rotates around the propeller.
  • the Kort nozzle is connected with the rudder post and positioned in the rudder heel.
  • the Kort nozzle is a combination of propulsion improving means and rudder since a rudder effect is achieved by the excursion of the propeller jet at an angle to the ship longitudinal axis.
  • the stern of the ship is pushed by the jet reaction propulsion.
  • FIG. 5 illustrates an embodiment of a Kort nozzle 200 positioned rotatable about the rudder axis of a ship with a fixed propeller placed therein as it is known from the prior art.
  • the Kort nozzle 200 is placed around the fixed ship propeller 210 of a ship (not represented here).
  • the Kort nozzle is pivoted under an angle a of approximately 30° about the ship longitudinal axis 220 .
  • the arrow 221 represents the flow direction of the sea water or salt water.
  • a fixed flap 230 is provided in flow direction behind the propeller on the Kort nozzle 200 , through which the flow properties of the Kort rudder nozzle are positively influenced.
  • the inlet area 201 (with respect to the direction of the flow passing through the Kort nozzle 200 ) is configured widened with respect to the remaining area of the Kort nozzle 200 . This means that the inner diameter of the inlet area is bigger than the inner diameter in the remaining area of the Kort nozzle 200 .
  • the water flow through the Kort nozzle 200 is increased which in turn increases the propulsion efficiency of the Kort nozzle.
  • FIG. 6 a shows schematically the topview of a cut Kort nozzle 200 as it is known from the state of the art.
  • the arrows in FIGS. 6 a and 6 b constitute the course of the flow.
  • the ship propeller 210 is drawn only schematically for reasons of clarity.
  • a movable or swivellable flap 231 is placed in flow direction behind the propeller 210 .
  • the Kort nozzle 200 is swivelled with an angle of approximately 15° with respect to the ship longitudinal axis.
  • the rear part of the wall 202 a of the Kort nozzle 200 has been rotated against the flow direction, i.e. to the propeller 210 , while the opposed part of the wall 202 b has been rotated with the flow direction accordingly.
  • the lower part area of the Kort nozzle 200 which is marked in FIG. 6 a is depicted enlarged in FIG. 6 b. It can be recognized therein that, due to the angular position of the Kort nozzle 200 with respect to the propeller 210 or to the ship longitudinal axis 220 , a swirl or recirculation of the flow forms in the outer edge area in flow direction directly behind the propeller 210 . Due to this recirculation, the mean flow rate in the main flow direction 221 is reduced to a minimum in this local area. Measurements and simulations in this area showed that there is a mean flow rate of 0.2 to 2 m/s in the main flow direction 221 . Compared to this, the mean flow rate is situated within a range of 12 to 16 m/s in the area between the flap 231 and the wall area 202 b.
  • the water which flows laminarly outside along the wall 202 a flows around the rounded-off edge of the wall of the Kort nozzle end area 203 to the inside and hits there the flow produced by the propeller 210 which is directed in the main flow direction 221 .
  • a part of the outer flow is directed to the inside against the main flow direction 221 and flows on the inner side of the wall 202 against the main flow direction 221 to the area behind the propeller 210 and from there back again through the propeller 210 .
  • a local circulation or recirculation of the flow is formed and the mean flow rate in the main flow direction 221 in this area is around zero. Therefore, the disadvantages described above occur.
  • the object of this invention is to provide a Kort nozzle for which the occurence of recirculations or swirls is avoided or reduced even with an angular position with respect to the ship longitudinal axis and which has a uniform over-all flow pattern.
  • At least one opening is provided in the wall of the Kort nozzle.
  • openings basically any opening of any configuration in the wall of the Kort nozzle is to be considered.
  • the opening extends through the whole wall and thus consists of an inner and of an outer opening area and a central area connecting these two areas. It is decisive that a flow connection is created for the sea water or the salt water from outside the Kort nozzle through the at least one opening into the inside of the Kort nozzle.
  • the wall of the Kort nozzle is formed by the nozzle ring which envelops the stationary ship propeller.
  • the at least one opening can be provided at any location of the wall of the Kort nozzle. However, preferably it is provided in a lateral area of the Kort nozzle, either on the starboard side, or on the port side.
  • the at least one opening is configured provided or placed in the wall in such a manner that, due to the at least one opening, sea water or salt water can flow from outside the Kort nozzle throughout this opening into the inside of the Kort nozzle in such a manner that the recirculations or swirls which develop at certain swivelling angles of the Kort nozzle are suppressed or considerably reduced. Tests of the applicant resulted in that, due to such openings, the thrust of the Kort nozzle has been increased in the side areas in which typically swirls or recirculations occur by up to 20%. Furthermore, the vibrations transmitted to the hull have been reduced.
  • a laminar flow is thus introduced from outside to the critical side areas of the Kort nozzle in which the swirls typically occur at certain swivelling angles.
  • This laminar flow avoids that a recirculation flow can be formed in the side areas against the main flow direction.
  • the thrust and the working stability and thus the efficiency of the Kort nozzle are considerably improved herewith.
  • both openings are placed substantially opposite each other.
  • both openings are moreover to be placed respectively in a side area of the Kort nozzle since normally the strongest swirls develop there for conventional Kort nozzles. It is thus guaranteed that the risk of the occurence of swirls or recirculations is reduced for a swivelling to the starboard side as well as for a swivelling to the port side.
  • the at least one opening is disposed in a central area.
  • the central area ranges from one third of the height of the Kort nozzle to approximately two thirds of the Kort nozzle, preferably from two fifths to three fifths of the height of the Kort nozzle. It is thus achieved that the at least one opening is placed in an area in which the swirls typically occur.
  • the laminar flow flowing through the at least one opening can develop an optimal effect and can suppress the swirl as much as possible.
  • the height of the Kort nozzle corresponds to its vertical extension when mounted, i.e. to the distance between the opposed wall areas of the Kort nozzle along its vertical axis or along the rudder axis.
  • the central areas of the Kort nozzle extend in their longitudinal extension over the whole length of the Kort nozzle. There are thus two central areas which are placed opposite to each other. According to another preferred embodiment of the invention, at least two openings are disposed in at least one of these two central areas. Furthermore, these at least two openings are placed in longitudinal direction of the Kort nozzle the one behind the other and/or in vertical direction lying above one another. Depending on the configuration of the Kort nozzle and of the propeller as well as the respective swivelling angle, the result to be achieved can thus be optimized, namely the improvement of the thrust and of the quiet running of the Kort nozzle. For this embodiment too, at least two openings are respectively provided in both central areas, whereby the openings of both central areas are advantageously placed opposite to each other.
  • the at least one opening is disposed in an area from one third to two thirds of the length, preferably from two fifths to three fifths of the length, particularly preferably in the middle.
  • the effect of the at least one opening can again be optimized by this measure too.
  • the at least one opening For a swivellable Kort nozzle with a fixed ship propeller placed therein, it is furthermore preferred to configure the at least one opening in such a manner that it is placed, for a swivelling angle of 10°, 15° or 20°, with its inner opening area substantially adjacent to the propeller. It is thus guaranteed that, for the above mentioned typical swivelling angles, the laminar flow which comes out of the inner opening area of the at least one opening, flowing from the outside to the inside into the Kort nozzle, hits directly the swirl area. The laminar flow can thus directly act against the recirculation flow and the effect of the at least one opening is further improved. Should in some cases other swivelling angles, for example 25° or 30°, be employed, the arrangement of the at least one opening can naturally be adapted accordingly.
  • the at least one opening for the efficiency of the Kort nozzle, it is provided in a further preferred embodiment of the invention to configure the at least one opening as an oblong slit. Moreover, it is advantageous that the slitlike opening substantially extends in the vertical direction. It is thus achieved that a vertically orientated flow band flows into the Kort nozzle from the outside to the inside and thus positively influences the critical area in which normally swirls develop. Furthermore, such an opening can be produced relatively easily.
  • the at least one opening extends obliquely from the outside to the inside with respect to the main flow direction through the wall. This means that the middle line of the openings is orientated with a predetermined angle to the main flow direction or to the longitudinal axis of the Kort nozzle. It is thus guaranteed that the outer laminar flow flows from the outside to the inside into the Kort nozzle and that no water flows from the inside to the outside through the at least one opening.
  • the at least one opening with respect to the longitudinal axis of the Kort nozzle with an angle of 10° to 60°, preferably 20° to 45°, particularly preferably 30° to 35°.
  • the indications of angles refer to the angle between the longitudinal axis of the Kort nozzle and the middle line of the at least one opening which extends from the outside to the inside through the at least one opening.
  • the at least one opening tapers from the outer side of the wall or from its outer opening area to its inner opening area on the inner side of the wall.
  • the at least one opening can be configured substantially constant over its whole extension.
  • At least one of the admission edges and/or at least one of the discharge edges of the at least one opening is to be configured rounded-off.
  • each opening has, for example for a slitlike vertically orientated opening, two vertically orientated admission edges and two vertically orientated discharge edges.
  • FIG. 1 a is a schematic perspective view of a Kort nozzle with two opposite openings which are positioned swivellable on the hull of a ship;
  • FIG. 1 b is a schematic sectional view of a portion of the Kort nozzle of FIG. 1 a;
  • FIG. 2 a is a schematic perspective view of a Kort nozzle swivellably positioned on a hull of a ship for which two openings situated in succession in a horizontal direction are placed in each central area;
  • FIG. 2 b is a schematic sectional view of the Kort nozzle of FIG. 2 a;
  • FIG. 3 is a schematic perspective view of a Kort nozzle swivellably positioned on the hull of a ship with respectively three openings situated in succession in a vertical direction in each central area;
  • FIG. 4 is a schematic sectional top view of a portion of a Kort nozzle with an opening with flow lines.
  • FIG. 1 a is a perspective view of a Kort nozzle 100 which is positioned swivellable on the hull 10 of a ship.
  • the hull 10 of a ship is depicted only partially for reasons of clarity.
  • the Kort nozzle is connected with the hull 10 by a bearing 12 and is rotatable about the rudder axis 11 .
  • the rudder axis 11 corresponds to the vertical axis.
  • the Kort nozzle 100 is furthermore connected with the hull in its lower area by a further bearing (not represented here). Considering the flow direction 13 , a movable or controllable flap 14 follows at the end of the Kort nozzle 100 .
  • the Kort nozzle 100 comprises a ring-shaped configured wall 15 which is configured conically and which tapers in the flow direction 13 .
  • An opening 16 is placed respectively in the central side areas 15 a, 15 b of the wall 15 with respect to the height of the Kort nozzle.
  • the openings 15 are placed substantially in the middle with respect to the height.
  • the openings 16 extend obliquely from the outside to the inside, this being considered in the flow direction 13 . They consist in a slit extending substantially vertically which tapers from the outside to the inside.
  • the openings 16 have an approximately shovel-type appearance since the outer opening area 16 a is wider than the inner opening area 16 b because of the taper of the opening 16 .
  • the propeller is omitted in FIG. 1 a for reasons of clarity but is placed, when mounted, inside the Kort nozzle 100 .
  • FIG. 1 b shows a sectional view of a portion of the Kort nozzle 100 of FIG. 1 a.
  • the wall of the Kort nozzle 100 of FIG. 1 b is cut in the area of an opening 16 .
  • the opening 16 extends in flow direction obliquely from the outside to the inside and that it tapers to the inside.
  • the outer opening area 16 a is wider than the inner opening area 16 b.
  • the rear admission edge 17 a is configured rounded-off while the front admission edge 17 b is configured angular.
  • the rear discharge edge 18 a is rounded-off in flow direction 13 while the front discharge edge 18 b is angular.
  • the outer opening area 16 a and the inner opening area 16 b of the opening are offset to each other, in particular they are placed offset laterally to each other.
  • the inner opening area 16 b is covered by the obliquely extending side walls of the opening 16 or by the wall 15 , with respect to a side view of the Kort nozzle 100 .
  • the opening is configured as a slitlike channel which extends obliquely from the outside to the inside in flow direction 13 .
  • FIG. 2 a shows a perspective view of a further embodiment of a Kort nozzle according to the invention 100 .
  • the flap 14 is supported in the upper rudder bearing 12 as well as in a lower flap bearing on the Kort nozzle 100 .
  • two openings 16 are respectively placed in the central areas 15 a, 15 b of the wall 15 , openings which are situated one behind the other in a ship longitudinal direction, when the Kort nozzle is not deviated, or in the longitudinal direction of the Kort nozzle.
  • FIG. 2 a that only the outer opening area of the openings 16 can be seen from the outside and the inner opening area is covered.
  • the outer and the inner opening area of the opening 16 are placed one behind the other in flow direction 13 .
  • FIG. 2 b shows a sectional view of the Kort nozzle 100 of FIG. 2 a. It can be recognized that the openings 16 are placed respectively opposite each other in both central areas 15 a, 15 b of the wall 15 . Moreover, these openings 16 extend obliquely from the outside to the inside in flow direction 13 . The single openings 16 are moulded respectively identical and thus extend parallel to each other.
  • FIG. 3 shows a further embodiment of a Kort nozzle 100 according to the invention.
  • three openings 16 placed one above the other in a vertical direction are provided in each central area 15 a, 15 b of the wall 15 .
  • the openings 16 are placed respectively in the middle with respect to the longitudinal direction of the Kort nozzle 100 .
  • the distance between the single openings 16 of a central area 15 a, 15 b is respectively approximately the same.
  • FIG. 4 shows a flow pattern of a side area of a Kort nozzle 100 with a portion of a schematically depicted propeller 20 .
  • the depiction of FIG. 4 is similar to that of FIG. 6 b, whereby contrary to the depiction of FIG. 6 b a Kort nozzle according to the invention with an opening 16 has been used.
  • the represented arrows symbolize the flow course of the water flowing through the Kort nozzle.
  • water flows from the outside to the inside through the opening 16 .
  • As soon as it passes the inner opening area 16 b of the opening 16 it flows further along the inner side of the wall 15 until it finally leaves the Kort nozzle 100 .

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  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Continuous Casting (AREA)
  • Nozzles (AREA)
  • Ship Loading And Unloading (AREA)
  • Casting Devices For Molds (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Hydraulic Turbines (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Spray Control Apparatus (AREA)
  • Soil Working Implements (AREA)
  • Road Repair (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
US12/069,171 2007-11-16 2008-02-07 Kort nozzle Abandoned US20090130927A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/838,994 US8246401B2 (en) 2007-11-16 2010-07-19 Kort nozzle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202007016163.8 2007-11-16
DE202007016163U DE202007016163U1 (de) 2007-11-16 2007-11-16 Kortdüse

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/838,994 Continuation US8246401B2 (en) 2007-11-16 2010-07-19 Kort nozzle

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US20090130927A1 true US20090130927A1 (en) 2009-05-21

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US12/069,171 Abandoned US20090130927A1 (en) 2007-11-16 2008-02-07 Kort nozzle
US12/838,994 Expired - Fee Related US8246401B2 (en) 2007-11-16 2010-07-19 Kort nozzle

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US12/838,994 Expired - Fee Related US8246401B2 (en) 2007-11-16 2010-07-19 Kort nozzle

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US (2) US20090130927A1 (ja)
EP (1) EP2060482B1 (ja)
JP (1) JP5184907B2 (ja)
KR (1) KR101216919B1 (ja)
CN (1) CN101434292B (ja)
AT (1) ATE555979T1 (ja)
DE (1) DE202007016163U1 (ja)
ES (1) ES2386467T3 (ja)
HK (1) HK1129640A1 (ja)
HR (1) HRP20120601T1 (ja)
PL (1) PL2060482T3 (ja)
SG (1) SG152959A1 (ja)
TW (1) TWI356791B (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120308382A1 (en) * 2010-02-22 2012-12-06 Becker Marine Systems Gmbh & Co. Kg Pivotable propeller nozzle for a watercraft
US11584492B1 (en) 2022-05-11 2023-02-21 John De Maria Directed thrust propulsion system
CN116573128A (zh) * 2023-07-14 2023-08-11 山东省水利科学研究院 一种船舶用具有防异物缠绕的螺旋桨推进机构

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011053619A1 (de) * 2011-09-14 2013-03-14 Becker Marine Systems Gmbh & Co. Kg Propellerdüse für Wasserfahrzeuge
CN102501960A (zh) * 2011-11-15 2012-06-20 无锡德林船舶设备有限公司 导管舵传动装置
CN104554684B (zh) * 2015-01-06 2017-05-17 舟山欣臻船舶设计有限公司 一种多功能船用导流罩
PL3088295T3 (pl) 2015-04-28 2019-12-31 Kongsberg Maritime CM AS Modułowa dysza jednostki napędowej
CN105240670B (zh) * 2015-11-13 2018-03-06 中国船舶重工集团公司第七二六研究所 水下吊放装置的湿端结构
JP1575726S (ja) * 2016-10-31 2017-05-08
CN109050853B (zh) * 2018-08-10 2021-02-19 哈尔滨工程大学 一种船用可拆导管螺旋桨
JP7216531B2 (ja) * 2018-12-07 2023-02-01 株式会社ケイセブン 操舵装置
CN110040231A (zh) * 2019-05-13 2019-07-23 哈尔滨工程大学 一种用于船后螺旋桨的不对称导管
CN110282107A (zh) * 2019-07-02 2019-09-27 哈尔滨工程大学 一种可分离式船用导管螺旋桨
CN110949643A (zh) * 2019-11-25 2020-04-03 中国船舶工业集团公司第七0八研究所 一种带尾叶的舵桨装置

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US2139594A (en) * 1936-02-08 1938-12-06 Kort Ludwig Combined propelling and steering device for screw propelled ships
US3508517A (en) * 1967-02-20 1970-04-28 Kort Propulsion Co Ltd Nozzles or shrouds for ships' propellers
US3738307A (en) * 1970-06-11 1973-06-12 Strommen Straal Strommen Raufo Propeller nozzle
US3899992A (en) * 1972-07-20 1975-08-19 Ronald George Fuller Marine steering device
US4637801A (en) * 1984-07-12 1987-01-20 William H. Flood Thrust enhancing propeller duct assembly for water craft
US6159062A (en) * 1997-04-24 2000-12-12 Taylor, Jr.; Guy High performance boat prop guard

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GB502564A (en) * 1937-07-20 1939-03-20 Ludwig Kort Improvements in combined propelling and steering device for screw-propelled ships
ES198772Y (es) * 1970-06-11 1975-11-16 Ans Strommen Staal Strommen-Raufoss Una disposicion de tobera de helice.
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JPS50154992A (ja) * 1974-06-04 1975-12-13
GB1507677A (en) * 1974-10-18 1978-04-19 Nat Res Dev Ducted propellers
JPS51100593A (ja) * 1975-03-03 1976-09-04 Kawasaki Heavy Ind Ltd Senpakuyokakeishanozuru
JPS532899U (ja) * 1976-06-25 1978-01-12
JPS554935U (ja) * 1978-06-24 1980-01-12
JPS5836999U (ja) * 1981-09-04 1983-03-10 川崎重工業株式会社 分離型ダクト・プロペラ
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US4957459A (en) * 1989-08-23 1990-09-18 Brunswick Corporation Propeller shroud with load bearing structure
US6475045B2 (en) * 2001-01-18 2002-11-05 Gregory C. Morrell Thrust enhancing propeller guard assembly

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US442615A (en) * 1890-12-16 Marine propulsion
US2139594A (en) * 1936-02-08 1938-12-06 Kort Ludwig Combined propelling and steering device for screw propelled ships
US3508517A (en) * 1967-02-20 1970-04-28 Kort Propulsion Co Ltd Nozzles or shrouds for ships' propellers
US3738307A (en) * 1970-06-11 1973-06-12 Strommen Straal Strommen Raufo Propeller nozzle
US3899992A (en) * 1972-07-20 1975-08-19 Ronald George Fuller Marine steering device
US4637801A (en) * 1984-07-12 1987-01-20 William H. Flood Thrust enhancing propeller duct assembly for water craft
US6159062A (en) * 1997-04-24 2000-12-12 Taylor, Jr.; Guy High performance boat prop guard

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120308382A1 (en) * 2010-02-22 2012-12-06 Becker Marine Systems Gmbh & Co. Kg Pivotable propeller nozzle for a watercraft
US9011088B2 (en) * 2010-02-22 2015-04-21 Becker Marine Systems Gmbh & Co. Kg Pivotable propeller nozzle for a watercraft
US11584492B1 (en) 2022-05-11 2023-02-21 John De Maria Directed thrust propulsion system
CN116573128A (zh) * 2023-07-14 2023-08-11 山东省水利科学研究院 一种船舶用具有防异物缠绕的螺旋桨推进机构

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SG152959A1 (en) 2009-06-29
JP5184907B2 (ja) 2013-04-17
PL2060482T3 (pl) 2012-10-31
HK1129640A1 (en) 2009-12-04
TWI356791B (en) 2012-01-21
US20100323566A1 (en) 2010-12-23
CN101434292B (zh) 2012-06-13
ES2386467T3 (es) 2012-08-21
TW200922837A (en) 2009-06-01
CN101434292A (zh) 2009-05-20
EP2060482A1 (de) 2009-05-20
US8246401B2 (en) 2012-08-21
EP2060482B1 (de) 2012-05-02
KR101216919B1 (ko) 2012-12-28
HRP20120601T1 (hr) 2012-08-31
ATE555979T1 (de) 2012-05-15
JP2009120169A (ja) 2009-06-04
DE202007016163U1 (de) 2008-01-24
KR20090050915A (ko) 2009-05-20

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