EP2548797B1 - Propulseur rétractable - Google Patents

Propulseur rétractable Download PDF

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Publication number
EP2548797B1
EP2548797B1 EP11005850.0A EP11005850A EP2548797B1 EP 2548797 B1 EP2548797 B1 EP 2548797B1 EP 11005850 A EP11005850 A EP 11005850A EP 2548797 B1 EP2548797 B1 EP 2548797B1
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EP
European Patent Office
Prior art keywords
shaft
propeller
retractable thruster
hull
propeller unit
Prior art date
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Application number
EP11005850.0A
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German (de)
English (en)
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EP2548797A1 (fr
Inventor
Tore Eriksen
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.)
Sleipner Motor AS
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Sleipner Motor AS
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Publication date
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Priority to EP11005850.0A priority Critical patent/EP2548797B1/fr
Publication of EP2548797A1 publication Critical patent/EP2548797A1/fr
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    • 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
    • B63H25/42—Steering or dynamic anchoring by propulsive elements; Steering or dynamic anchoring by propellers used therefor only; Steering or dynamic anchoring by rudders carrying propellers
    • B63H2025/425—Propulsive elements, other than jets, substantially used for steering or dynamic anchoring only, with means for retracting, or otherwise moving to a rest position outside the water flow around the hull

Definitions

  • the present invention relates to the field of thrusters for watercrafts, such as vessels and smaller boats and sailboats. More particularly it relates to thrusters that can be retracted into the hull of the watercraft when they are not in use, such as thrusters used for docking a boat.
  • Thrusters for manoeuvring a watercraft have been known for a long time.
  • Different types of thrusters exist, such as the azimuth thruster which is a combined propulsion and steering device that can be rotated to turn the ship or boat.
  • the tunnel thruster used mainly for larger vessels requires a thruster tunnel to be built into the hull below the waterline. An impeller in the tunnel can create thrust in either direction.
  • Externally mounted thrusters are mainly used for smaller boats where thrusters have to be retrofitted, and the space in the hull is limited. Such thrusters will increase the boats resistance to forward motion if they are below the water line during normal propulsion.
  • European patent application EP 1 876 094 A2 shows a retractable thruster for a vessels where the propeller unit and the electric motor are moved between a recessed position and an operational position.
  • the propeller unit and the electric motor are comprised in a piston element that can be moved inside a housing by applying hydraulic pressure on the piston.
  • US patent 5152240 (Fontanille) describes a retractable and storable thruster for a vessel, using a trapezoidal deformable rotatable device producing rectilinear movement inside a well in the vessel's hull.
  • US patent application US 2006/0060127 shows a retractable thruster comprising a propulsion assembly comprising a rigid structure secured to a propeller housing and containing a motor driving the propeller inside the propeller housing via at least one rotary shaft between the motor and the propeller.
  • Displacement means enable the propulsion assembly to be moved between retracted and deployed positions by the propulsion assembly performing uniform circular movement about an axis of rotation situated substantially at the level of the hull or beneath the hull.
  • European patent application EP2 246 252 A2 shows a thruster that can be tilted into a thruster housing in the hull of a boat.
  • the thruster and the thruster motor driving the propeller are both tiltably connected to a swing frame and will rotate around an axis of the swing frame when moving from an extracted position to a retracted position and vice versa.
  • An object of the present invention is to disclose a retractable thruster that is smaller in size than comparable thrusters according to prior art, since the available space in the hull of a watercraft is generally limited.
  • Another object of the invention is to disclose a retractable thruster that can easily be retrofitted in the hull of an existing boat or watercraft and reducing the size of the recess opening for the retractable thruster in the hull, as well as being robust in operation. Due to the problems related to the wear and tear of cables and components as the motor is moved during the retraction, it is also an object of the invention that the motor shall be fixed mounted relative the hull of the boat, and that adaptation and retrofitting to different hull shapes shall be easy.
  • the invention is a retractable thruster according to claim 1.
  • An advantage of a retractable thruster is that the thruster does not influence the boats resistance to forward motion significantly when the thruster is in a retracted position.
  • the space taken up by the thruster inside the hull can be made smaller than for prior art retractable thrusters with rectilinear lowering of the thruster, since the movement is rotational rather than e.g. telescopic.
  • one problem with rotational movement is that the door opening in the hull may become large due to the geometry of the rotation.
  • An advantage according to the invention is that the rotating door of the retractable thruster can be made shorter since it is rotating opposite of the main rotation, resulting in a smaller opening in the hull.
  • An advantage of the present invention is that the motor is arranged fixed inside the hull of the boat instead of in the propeller unit as has been proposed by some prior art. According to the invention there are no bending electrical wires, and no electrical components need to be lowered with the propeller unit. This may reduce failures and wear of such components considerably.
  • the propeller unit (20) comprises a propeller shaft (21) with one or more propellers (22) wherein the motor (10) is arranged for driving the propeller shaft (21).
  • the retractable thruster (1) comprises a drive shaft (15) between a motor shaft (11) of the motor (10) and the propeller shaft (21).
  • the retractable thruster according to the invention is mechanically robust due to its compact design resulting from the novel features described above.
  • the drive shaft (15) is a foldable double cardan joint drive shaft comprising;
  • An advantage of the foldable double cardan joint drive shaft according to the invention is that the propeller unit can be rotated into the hull independent of the angular position of the drive shaft, and that the drive shaft suffers from a much smaller length variation from the extended position to the retracted position compared to the use of a conventional double cardan joint drive shaft.
  • the reason for this is that the foldable double cardan joint drive shaft may collapse in three dimensions when the thruster moves into its retracted position compared to two dimensions for a conventional double cardan joint drive shaft.
  • the drive shaft (15) is mainly rectilinear in its longitudinal direction and coincident with a rotational axis (11a) of the motor shaft (11) when the propeller unit (20) is in the extended position (B).
  • FIG. 1 a side view of a retractable thruster (1) according to an embodiment of the invention, with the propeller unit (20) in an extracted position is shown.
  • Fig. 2 illustrates in a partly exploded top perspective view the retractable thruster of Fig. 1 .
  • Fig. 3 illustrates in a simplified drawing the propeller unit (20) and the door (30) of the retractable thruster in a retracted position (A) and an extended position (B). It also illustrates the second direction of rotation (s) of the door (30) relative the first direction of rotation (r) of the propeller housing (20) between these two positions.
  • the retractable thruster (1) for a watercraft with a hull (2) comprises an opening (3), wherein the retractable thruster (1) comprises;
  • the watercraft where the retractable thruster (1) is installed or is to be installed has an opening in the hull (2) where the retractable thruster (1) can be mounted as seen in Fig. 1 .
  • the thruster comprises in an embodiment of the invention a housing (70) that is mounted into the hull (2).
  • the housing (70) allows simpler and easier adaption to different hull (2) shapes.
  • the motor (10) is fixed relative the hull (2), preferably to the housing (70) that itself is arranged for being fixed to the hull (2).
  • the motor may be e.g. electric or hydraulic and connected by electrical cables or hydraulic tubes.
  • the fixed motor (10) simplifies wiring and reduces the wear and tear of cables and tubes.
  • simple bushings can be used in the wall of the housing (70) between the motor (10) and the cabling in the hull (2).
  • the propeller unit (20) is arranged for moving between the retracted position (A) inside the hull (1) and the extended position (B) outside the hull (1) as shown in Fig. 3 along an arc (AB).
  • the arc (AB) is a part of a circumference of a circle with centre (O) inside the hull (2).
  • the centre (O) is close to the bottom of the hull (2).
  • the arc (AB) is a part of a circumference of an ellipse with centre (O).
  • the arc (AB) may in other embodiments of the invention be any kind of arc.
  • the retractable thruster (1) comprises a door (30).
  • the door (30) is arranged for moving with propeller unit (20) when the propeller unit (20) moves along the arc (AB) in the first direction of rotation (r).
  • the door (30) is arranged for closing the opening (2), and when the propeller unit (20) travels from the retracted position (A) to the extended position (B) the door (30) is arranged to follow the propeller unit.
  • the door In the extended position (B) the door is then moved away from the opening (2) to allow the propeller unit (2) to be in the extended position (B). From the extended position (B) to the retracted position (A) the propeller moves along the arc (AB) opposite the first direction of rotation (r).
  • the door (30) is arranged for rotating with a second direction of rotation (s) opposite of the first direction of rotation (r).
  • the propeller unit (2) starts extending from the retracted position (A) in an embodiment of the invention by moving along the arc (AB) in the direction of rotation (r).
  • the door (30) will move with the propeller unit (2) as described above, and in addition the door (30) will rotate with a second direction of rotation (s) that is opposite the first direction of rotation (r) until the propeller unit (2) reaches its extended position (B).
  • Fig. 3 it is illustrated the position that a door (30') would have had in the extended position (B) if it had not rotated with the second direction of rotation (s). This would clearly not be a good solution.
  • the extent of the rotation of the door (30) in the second direction of rotation (s) depends on the design of the retractable thruster (1).
  • the door (30) should in the extended position constitute a shield for the propeller unit (20) in the forward direction of the boat.
  • the top of the door is close to the hull (2) of the boat and the bottom of the door is inclined backwards with respect to the longitudinal direction of the boat.
  • the door (30) may in this embodiment protect the propeller unit (20) against underwater obstacles, such as underwater rocks, that may be located just below the hull and therefore are hard to discover. This is especially important when retractable thrusters are used during docking in shallow water.
  • the propeller unit (20) comprises a propeller shaft (21) with one or more propellers (22) and wherein the motor (10) is arranged for driving the propeller shaft (21).
  • the propeller shaft (21) is arranged perpendicular to the longitudinal direction of the boat, and the one or more propellers (22) on the propeller shaft (21) will then arranged in the transverse direction of the boat and provide a lateral thrust.
  • the force and direction of the lateral thrust will depend on the shape of the propellers (22) and the speed and direction of the rotation of the propeller shaft (21).
  • the motor (10) is an electric motor, and the direction of the lateral thrust can be changed by changing the polarity of the DC voltage of the motor (10).
  • the propeller shaft (21) is arranged for being aligned with the longitudinal direction of the boat.
  • the retractable thruster may then also be used as an alternative or backup propulsion device.
  • the door (30) is arranged for rotating about the propeller shaft (21) with the second direction of rotation (s).
  • other centres of rotation for the door may also be used to achieve the same functionality.
  • the door (30) is fixed to the propeller unit (20). Accordingly the door and propeller unit will in this embodiment rotate with the same rotational speed around the same centre of rotation, which may be the rotational axis of the propeller shaft (21).
  • the retractable thruster (1) comprises a drive shaft (15) between a motor shaft (11) of the motor (10) and the propeller shaft (21).
  • the drive shaft (15) is arranged for the transfer of rotational motion from the motor shaft (15) to the propeller shaft (21) when the motor (10) is running.
  • the drive shaft (15) may be connected to the propeller shaft (21) by a gear, such as a bevel gear, a worm gear or any other suitable gear.
  • the motor shaft (11) may also be connected to the propeller shaft (21) by e.g. sprockets and chains, hydraulic transmission, etc.
  • the drive shaft (15) is a foldable double cardan joint drive shaft as illustrated in Fig. 5 comprising;
  • the drive shaft (15) can be folded independently of the rotational position of the driving shaft (140) and the second pivot axis (b).
  • the intermediate shaft (180) is a fixed length shaft.
  • a spring loaded telescopic shaft may in an embodiment also be used.
  • the offset axis (g) will coincide with the rotational and longitudinal axis of the intermediate shaft (180) when the retractable thruster in the extended position (A). In other positions, the offset axis (g) will wobble if the drive shaft is rotated, but since no energy needs to be transferred to the propeller axis (21) from the motor shaft (11) in these positions, only rotational movement related to the rotational alignment of the propeller axis (21) with the motor shaft (11) needs to be considered when the retractable thruster (1) is not in the extended position (A)
  • the drive shaft (15) is mainly rectilinear in its longitudinal direction and coincident with a rotational axis (11a) of the motor shaft (11) when the propeller unit (20) is in the extended position (B). This ensures that the drive shaft (15) has no bends and that energy is transferred optimally.
  • the arc (AB) is a circular arc and the propeller unit (20) is arranged for moving between the retracted position (A) and the extended position (B), along the arc (AB) where a central angle ( ⁇ ) of the arc (AB) is at least 90 degree, as shown in Fig. 3 .
  • the retractable thruster (1) comprises a seal (190) around the driven shaft (170) for tightening against the propeller unit.
  • the seal (190) may be flexible in the longitudinal direction of the driven shaft (170), and expanded in the length direction by a spring that pushes one end of the seal (190) towards the propeller unit (20) and the other end towards a fixed point of the driven shaft (170), such as a flange, to take up small length variations in the drive shaft (15) between the retracted position (A) and the expanded position (B).
  • the retractable thruster (1) comprises at least one first arm (40) comprising a first revolute joint (41) in a first end of the first arm (40) and a second revolute joint (42) in a second end of the first arm (40), where the first revolute joint (41) is rotatably connected in the origo (O) of a sector defined by the arc (AB), and the second revolute joint (42) is rotatably connected to the propeller unit (20) at a rotary point (ab) along the arc (AB).
  • the first revolute joint (41) is centred in the centre of rotation of a point along the arc AB, and the second revolute joint (42) is fixed to the propeller unit (20) at a point that should follow the arc (AB).
  • the propeller unit (20) can now move between the retracted position (A) and the extended position (B). Stoppers may be used to restrict the end positions of the movement of the first arm (40).
  • the rotary point (ab) may in an embodiment of the invention coincide with a rotational axis of the propeller shaft (21).
  • the door rotates in the opposite direction of the movement of the propeller unit around the centre (O).
  • the retractable thruster comprises at least one track rod (50), as illustrated in Fig. 5 , being rotatably connected to a first track rod point (51) fixed relative the motor (10) in a first end of the track rod (50) and rotatably connected to a second track rod point (52) fixed relative the propeller unit (20) in a second end of the track rod (50).
  • a passive mechanical solution such as a track rod has several advantages related to reduced wear and maintenance.
  • the retractable thruster comprises in an embodiment of the invention an actuator (60), as can be seen illustrated in Fig. 1 and Fig. 2 , arranged for moving the propeller unit along the arc (AB) between the retracted position (A) and the extended position (B) by applying a force to at least the first arm (40) relative the hull (2).
  • the actuator may be rotatably connected in one or both ends to a point fixed relative the hull in one end, and to a point fixed relative the first arm (40) in the other end. Different types of actuators may be used such as electrical, hydraulic, etc.
  • the retractable thruster (1) comprising a housing (70), wherein the motor (10) is fixed relative the housing (70) inside the housing (70), and an adapter frame (71) comprising the opening (2), wherein the adapter frame (71) is arranged for being mounted between the hull (2) and the housing (70).
  • the separation of the adapter frame (71) from the housing (70) allows different frames to be made for the different hull types, where the adapter frame (71) is adapted to the specific hull (2) underneath, and to the housing (70) on the top.
  • the same housing may be used for a large number of hull types.
  • the door (30) fits to the opening (2) of the housing (70) or adapter frame (71) when it is in the retracted position (A).
  • the retractable thruster (1) comprises one or more security devices (not shown) to protect the retractable thruster (1) and the boat against damages if the retractable thruster (1) should be run into an obstacle when not in the retracted position (A).
  • the security device may e.g. be a breakable pin in one of the ends of the actuators so that the pin breaks and the propeller unit (20) and the door (30) are allowed to be pushed into the hull (2) in such cases.
  • a breakable pin it could also be any kind of flexible device that will allow the actuator to loose the grip in one of its ends above a certain force, and to allow refitting without spare parts.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Power-Operated Mechanisms For Wings (AREA)

Claims (13)

  1. Propulseur rétractable (1) pour un véhicule marin avec une coque (2) comportant une ouverture (3), dans lequel ledit propulseur rétractable (1) comprend ;
    - un moteur (10) agencé pour être fixé à l'intérieur de ladite coque (2) dudit véhicule marin,
    - une unité d'hélice (20) agencée pour se déplacer le long d' un arc (AB) autour d' un premier centre de rotation avec un premier sens de rotation (r) entre une position rétractée (A) à l'intérieur de ladite coque (2) et une position saillante (B) en dehors de ladite coque (2),
    - une porte (30) agencée pour fermer ladite ouverture (3) lorsque ladite unité d'hélice (20) est dans ladite position rétractée (A), ladite porte (30) étant en outre agencée pour se déplacer avec ladite unité d'hélice (20) dans ledit premier sens de rotation (r) le long dudit arc (AB), et ladite porte étant en outre agencée pour tourner autour d'un second centre de rotation avec un second sens de rotation (s) opposé audit premier sens de rotation (r).
  2. Propulseur rétractable (1) selon la revendication 1, dans lequel ladite unité d'hélice (20) comprend un arbre d'hélice (21) avec une ou plusieurs hélices (22) et dans lequel ledit moteur (10) est agencé pour entraîner ledit arbre d'hélice (21).
  3. Propulseur rétractable (1) selon la revendication 2, comprenant un arbre d'entraînement (15) entre un arbre moteur (11) dudit moteur (10) et ledit arbre d'hélice (21).
  4. Propulseur rétractable (1) selon la revendication 3, dans lequel ledit arbre d'entraînement (15) est un arbre d'entraînement à double joint de cardan pliable comprenant :
    - un arbre d'entraînement (140),
    - un arbre intermédiaire (180),
    - un arbre entraîné (170),
    - un premier joint universel (150), et
    - un second joint universel (160),
    dans lequel ledit premier joint universel (150) est disposé entre ledit arbre d'entraînement (140) et ledit arbre intermédiaire (180), et comporte un arbre transversal (151) décalé avec un axe de décalage (g), comprenant :
    - un premier arbre de pivotement (151a) avec un premier axe de pivotement (a) connecté audit arbre intermédiaire (180) et
    - un second arbre de pivotement (151b) connecté audit arbre d'entraînement (140), dans lequel lesdits premier et second axes de pivotement (a, b) sont tous les deux perpendiculaires audit axe de décalage (g) et l'un par rapport à l'autre, et dans lequel ledit premier axe de pivotement (a) est décalé d'une distance de décalage (o) par rapport audit second axe de pivotement (b) dans la direction dudit axe décalé (o).
  5. Propulseur rétractable (1) selon la revendication 3 ou 4, dans lequel ledit arbre d'entraînement (15) est essentiellement rectiligne dans sa direction longitudinale et est confondu avec un axe de rotation (11a) dudit arbre moteur (11) lorsque ladite unité d'hélice (20) est dans ladite position saillante(B).
  6. Propulseur rétractable (1) selon la revendication 2, dans lequel ladite porte (30) est agencée pour tourner autour dudit arbre d'hélice (21).
  7. Propulseur rétractable (1) selon la revendication 3 ou 4, dans lequel ladite porte (30) est fixée à ladite unité d'hélice (20) et ladite unité d'hélice (20) est agencée pour tourner dans ledit second sens de rotation (s) autour dudit arbre d'hélice (21).
  8. Propulseur rétractable (1) selon la revendication 5, comprenant au moins un premier bras (40) comprenant une première liaison pivot (41) à une première extrémité dudit premier bras (40) et une seconde liaison pivot (42) à une seconde extrémité dudit premier bras (40), où ladite première liaison pivot (41) est reliée de manière rotative dans l'origine (O) d'une zone définie par ledit arc (AB), et ladite seconde liaison pivot (42) est reliée de manière rotative à ladite unité d'hélice (20) en un point de rotation (ab) le long dudit arc (AB).
  9. Propulseur rétractable (1) selon la revendication 6, dans lequel ledit point de rotation (ab) coïncide avec ledit arbre d'hélice (21).
  10. Propulseur rétractable (1) selon l'une quelconque des revendications 1 à 7, comprenant au moins une barre d'accouplement (50) qui est reliée de manière rotative en un premier point d'accouplement (51) fixé par rapport audit moteur (10) à une première extrémité de ladite barre d'accouplement (50) et qui est reliée de manière rotative en un second point d'accouplement (52) fixé par rapport à ladite unité d'hélice (20) à une deuxième extrémité de ladite barre d'accouplement (50).
  11. Propulseur rétractable (1) selon l'une quelconque des revendications 1 à 9, comprenant un actionneur (60) agencé pour déplacer ladite unité d'hélice le long dudit arc (AB) entre ladite position rétractée (A) et ladite position saillante (B) en appliquant une force audit au moins premier bras (40) par rapport à ladite coque (2).
  12. Propulseur rétractable (1) selon l'une quelconque des revendications 1 à 11, comprenant un boîtier (70), dans lequel ledit moteur (10) est fixé audit boîtier (70) à l'intérieur dudit boîtier (70), et un châssis (71) comprenant ladite ouverture (3), dans lequel ledit châssis (71) est agencé pour être monté entre ladite coque (2) et ledit boîtier (70).
  13. Propulseur rétractable (1) selon la revendication 1, dans lequel ledit arc (AB) est un arc circulaire et ladite unité d'hélice (20) est agencée pour se déplacer entre ladite position rétractée (A) et ladite position saillante (B), le long dudit arc (AB) où un angle au centre de l'arc (AB) est d'au moins 90 degrés.
EP11005850.0A 2011-07-18 2011-07-18 Propulseur rétractable Active EP2548797B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11005850.0A EP2548797B1 (fr) 2011-07-18 2011-07-18 Propulseur rétractable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11005850.0A EP2548797B1 (fr) 2011-07-18 2011-07-18 Propulseur rétractable

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EP2548797A1 EP2548797A1 (fr) 2013-01-23
EP2548797B1 true EP2548797B1 (fr) 2014-07-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3587240A1 (fr) 2018-06-22 2020-01-01 Lewmar Limited Propulseur rétractable et arbre pour propulseur rétractable

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104085507A (zh) * 2014-07-25 2014-10-08 张家港市海丰水面环保机械有限公司 一种新型履带式水路两用割草打捞船
GB2544467A (en) 2015-11-12 2017-05-24 Lewmar Ltd Retractable thruster
NO346005B1 (en) 2021-03-23 2021-12-20 Sleipner Motor As Retractable thruster

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2652559B1 (fr) 1989-09-29 1995-04-28 Guy Fontanille Propulseur retractable ou escamotable utilisant un dispositif trapezouidal a rotation deformante engendrant un mouvement rectiligne a l'interieur d'un puits.
DE19601226A1 (de) * 1996-01-15 1997-07-17 Gerd Elger Anordnung zum Steuern eines Wasserfahrzeuges unter Benutzung einer einen gerichteten Wasserstrahl erzeugenden Vorrichtung
FR2853620B1 (fr) 2003-04-09 2006-05-05 Max Power Propulseur retractable par rotation
SE524699C2 (sv) * 2003-07-14 2004-09-21 Rybeck Marin Consult Ab Styranordning
EP1876094A3 (fr) 2006-07-06 2008-03-19 Neta N.V. Propulseur rétractable pour vaisseaux
DE102009019539B3 (de) 2009-04-30 2010-11-25 Howaldtswerke-Deutsche Werft Gmbh Unterseeboot

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3587240A1 (fr) 2018-06-22 2020-01-01 Lewmar Limited Propulseur rétractable et arbre pour propulseur rétractable

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