Magnus rotor assembly

Abstract

The invention relates to a Magnus rotor assembly comprising at least one Magnus rotor which is mounted on an axle, the axle comprising at least a first and a second axle segment which are slidable relative to one another.

Description

[0001] August 28, 2025

[0002] Magnus rotor arrangement

[0003] DESCRIPTION

[0004] The invention relates to a Magnus rotor arrangement comprising at least one Magnus rotor which is mounted on a support axis.

[0005] A Magnus rotor is a preferably circular-cylindrical rotating component that utilizes the Magnus effect to generate lift or lateral forces. This effect is caused by the rotation of the cylinder in a flowing medium, such as air or water. Magnus rotors are used in various applications to achieve aerodynamic or hydrodynamic advantages, particularly in the maritime sector and in wind turbines. They are especially favored in maritime applications as sail engines, where they are better known as Flettner rotors.

[0006] A Magnus rotor typically consists of a smooth, cylindrical body that rotates along its longitudinal axis. The cylinder is usually made of lightweight yet robust materials and can vary in size depending on the application. The cylinder is set into rotation at a specific speed. This rotation creates varying flow velocities of air or water around the cylinder. The side of the cylinder moving with the flow generates lower pressure, while the other side, moving against the flow, generates higher pressure. This difference in flow velocity creates a pressure differential, resulting in a force perpendicular to the flow direction. This force can be used as lift or lateral thrust, depending on the cylinder's orientation relative to the flow.

[0007] In shipping, Magnus rotors or Flettner rotors are installed on ships to generate additional thrust, thus reducing fuel consumption. These ships utilize the Magnus effect similarly to how sailing ships harness the wind. Magnus rotors are also used in wind energy generation. Wind turbines with Magnus rotors utilize the [date missing] August 28, 2025

[0008] Magnus effect, by using rotating cylinders instead of conventional blades to drive a generator.

[0009] A Magnus rotor, used as a sail-powered engine on ships, typically consists of a single cylinder or several cylinder sections flanged or bonded together. Such a single cylinder is then mounted to rotate around a vertical support axis, or rotor axis, and is usually driven electrically or mechanically. When the rotating cylinder is exposed to wind, the rotation generates lift perpendicular to the wind direction, which can be used as additional thrust for the ship. The rotor body, or cylinder, usually has a diameter of approximately 0.1 m to 6 m or more, and a length roughly 1 to 10 times its diameter.

[0010] The use of a Magnus rotor can lead to significant fuel savings in shipping, as the additional lift or thrust complements the engine power. Furthermore, it can be particularly effective under certain conditions, such as headwinds.

[0011] Implementing a Magnus rotor requires precise control of speed and direction to optimize its effect. Furthermore, the rotor must be designed to withstand wind and water loads. Another challenge is the typically considerable height of a Magnus rotor assembly. When used on a ship, such an assembly is often designed to be foldable. Depending on the clearance under bridges, the assembly is sometimes folded away to prevent damage to the bridge or the rotor. The assembly, which protrudes upwards on the deck, can also be an obstacle during loading and unloading.

[0012] The invention is based on the objective of providing a Magnus rotor arrangement that is easy to stow away.

[0013] This problem is solved by a device according to claim 1. Advantageous embodiments are specified in the dependent claims. August 28, 2025

[0014] According to the invention, a Magnus rotor arrangement comprises at least one Magnus rotor which is mounted on a support axis, wherein the support axis comprises at least a first and a second axis segment which are designed to be displaceable relative to each other.

[0015] Large Magnus rotors, reaching heights of 15 to 50 meters, are used particularly in shipping. Such tall rotors are often disadvantageous on ships, especially when cranes are used for loading or in areas where bridges restrict the ship's height. Sometimes, high deck loads, such as containers, are present, and the rotors should operate above these loads in unobstructed wind. The Magnus rotor arrangement according to the invention provides the possibility of lowering the rotors, raising them to a higher position, or collapsing them telescopically to a lower height.

[0016] It can be provided that a typically very tall single rotor is divided into two or more rotors, which can then be stacked on top of or inside one another. To ensure that the individual rotor parts run concentrically and precisely relative to each other, all rotor parts are guided on a central support axis (also called rotor shaft or rotor axis). According to a preferred embodiment, this support axis can be telescopically extended or retracted, with the individual telescopic sections acting as linear guides to maintain the concentricity of the rotor bearings relative to each other. This means that the rotor bearings remain concentric relative to each other, but the telescoping capability can be achieved with other linear guide mechanisms.

[0017] A support shaft designed as a telescopic shaft or telescopic axis can also be used to raise one or more individual rotors to allow the rotors to operate in a wind zone undisturbed by objects in the vicinity of the installation site (for example, deck cargoes), or, for example, to partially or completely move them into a designated container in the bottom area of ​​the installation site (for example, ship's hull) during work in the area of ​​the installation site (for example, loading work).

[0018] ,.. / 4 August 28, 2025

[0019] Especially when using the Magnus rotor assembly on ships or in corrosive environments, it is advisable to manufacture parts of the Magnus rotor assembly, particularly sliding or roller guides and / or clamping components, from corrosion-resistant or at least seawater-resistant materials or plastics. Furthermore, it is advantageous to equip sliding or roller guides with emergency running properties, i.e., so that these parts can operate without lubrication.

[0020] In particular, it is intended that the first and second axle segments are designed to be movable relative to each other in such a way that the supporting axle can be length-adjusted, in particular telescopically, by means of moving the axle segments.

[0021] The axle segments are preferably rod-shaped. In a first embodiment, the support axle is designed with axle segments having decreasing or increasing diameters relative to each other. This allows a segment with a smaller diameter to be moved into a segment with a larger diameter. The segments can be straight, cylindrical, or conical. Advantageously, the segments are designed so that they can slide easily into one another.

[0022] Alternatively, it is also conceivable that the axle segments are arranged side by side in a suitable manner and guided against each other, e.g. by means of a linear guide, a sliding guide and / or roller guide. However, when using multiple rotors, more effort is required to ensure the concentricity of individual rotor bearings.

[0023] It is conceivable that the supporting axis has a rotation lock, so that at least two, preferably all, axis segments that can be moved relative to each other are secured against rotation about the longitudinal axis.

[0024] In a first embodiment, the Magnus rotor arrangement is envisaged to have a single Magnus rotor, which is displaceable relative to an end region of the support axis by means of the displaceable axle segments. Alternatively, it is also conceivable that the Magnus rotor arrangement has at least two, preferably more than two, Magnus rotors.

[0025] ...15 28 August 2025 wherein at least one Magnus rotor is displaceable by means of displacement of an axle segment relative to an end region of the support axis.

[0026] Particularly when installing the Magnus rotor assembly on board a ship, it is important that the end of the support axis is anchored in a foundation. The foundation can be a stable platform, for example, made of steel and / or concrete. The support axis is preferably aligned perpendicular to the installation location (on a ship, preferably perpendicular to the water surface) and its lower end, in the vertical direction, is attached to the foundation by means of a form-fit, force-fit, and / or material-fit connection. In this configuration, the Magnus rotors, which are supported by the slidably arranged axis segments, are height-adjustable.

[0027] Alternatively, it is also conceivable that the support axis of the Magnus rotor assembly is oriented perpendicular to the vertical direction in its application position. The Magnus rotors are then movable in a concertina-like fashion.

[0028] The Magnus rotor arrangement can be designed to be particularly space-saving if the Magnus rotor arrangement has at least two, preferably more than two Magnus rotors, and if at least two Magnus rotors are designed in such a way that they can be slid into one another, at least partially.

[0029] The idea behind the nesting mechanism is that one rotor has a cavity into which another rotor can be partially slid. This allows for a stacking or nesting principle.

[0030] The primary design consideration is that all Magnus rotors are designed to be at least partially retractable. This allows the Magnus rotor assembly to be stowed as compactly as possible in its retracted operating position. Compact stowage is particularly advantageous when installed on a ship. It facilitates loading and unloading, as well as reducing the overall height when passing under bridges.

[0031] ...16 August 28, 2025

[0032] It is also conceivable that only some of the rotors are telescoping. This can be useful if only a portion of the arrangement is to be extendable or if the rotor diameter is to remain as large as possible. For example, if two rotors are always telescoping, the overall height of the arrangement in its retracted operating position can be halved or almost halved compared to its extended operating position.

[0033] Furthermore, it is conceivable that the end section of the assembly, which is attached to a foundation at the installation site, is located below a working level, such as a ship's deck. In this way, the Magnus rotor assembly can be stowed below the working level when retracted. It is also possible for the Magnus rotor assembly to protrude through a closable opening in the working level when extended. When retracted, the Magnus rotor assembly can end below the opening, allowing the opening above the assembly to be closed.

[0034] To provide a stable and robust design, a preferred embodiment provides for at least one of the Magnus rotors to be rotatably mounted on the support axis. It is also conceivable that the Magnus rotors, or at least some of them, are fixedly mounted on the support axis or on the axis segments, and that the support axis itself or the axis segments are each rotatably mounted to one another.

[0035] In the preferred embodiment with rotors rotatably mounted on the support axis or on the axis segments, each of these rotors is mounted on an axis segment by means of a rotary bearing, in particular a ball bearing. It is also conceivable that one axis segment can support two or more rotors.

[0036] To ensure high flexibility in the operation of the Magnus rotor arrangement, it is intended that the Magnus rotor arrangement has at least two, preferably more than two Magnus rotors, and wherein two or more than two of the Magnus rotors are rotatably mounted on the support axis independently of each other.

[0037] ,.. / 7 August 28, 2025

[0038] For the rotation of a rotor, at least one motor can be arranged in a rotationally fixed manner on the support axis or on an axis segment of the support axis, which drives one or more rotors by means of a gearbox, a belt drive or the like. Preferably, one motor is arranged on the support axis for each rotor of the arrangement, driving the respective rotor.

[0039] For the fastening of the support axle in an extended and / or in a retracted operating position of the Magnus rotor arrangement, it is intended that the Magnus rotor arrangement includes a locking device by means of which the first axle segment and the second axle segment can be locked against displacement.

[0040] The locking device can be implemented, for example, using clamps, locking bolts, screw locks, clamps, or similar components. The locking device clamps and / or blocks the axle segments in their intended working position, eliminating play. This provides an arrangement that exhibits high stability in the extended operating position.

[0041] It is conceivable that the axle segments can be locked in a specific position, such as fully extended or fully retracted, in different stages, i.e., in different intermediate positions or steplessly relative to each other.

[0042] To compensate for vibrations introduced into the arrangement at the installation site, it is conceivable that the locking device has a damping device by means of which vibrations acting on the axle segments can be dampened.

[0043] In a first variant, it is envisaged that the damping device comprises a rubber layer or other elastic elements that are arranged between fastening areas, in particular between fastening areas of the locking device that are clamped to each other.

[0044] For the design of the Magnus rotors, it is intended that at least one or more of the Magnus rotors (12) are straight cylindrical, in particular straight circular cylindrical,

[0045] ,.. / 8 28 August 2025 or pyramid-shaped, in particular tetrahedral, or prism-shaped, in particular cuboid-shaped.

[0046] The aerodynamic properties of the arrangement can be improved by providing a Magnus rotor (12) with a first collar element (20a) extending radially beyond the diameter of this Magnus rotor (12) at its end in the longitudinal direction.

[0047] The collar element can be designed as a plate that is positioned at the end of the rotor and at least partially closes off the rotor at that end. Alternatively, it is also conceivable that the collar element projects radially outwards at the end of the rotor body without any radially inward-extending surfaces.

[0048] The aerodynamic properties are further improved by the fact that a Magnus rotor has a second collar element extending radially beyond the diameter of this Magnus rotor at its end in the longitudinal direction.

[0049] In a Magnus rotor arrangement with only one rotor, it is assumed that this single rotor has a collar element at each end of the rotor housing that projects radially beyond the diameter of the Magnus rotor in the longitudinal direction. When using more than one rotor, particularly when using nested rotors, it is assumed that a first rotor, especially one arranged longitudinally at its end on the support axis, has a first collar element that projects radially beyond the diameter of the Magnus rotor, and a second rotor, especially one arranged longitudinally at the end of the support axis opposite the first end of the support axis, has a second collar element that projects radially beyond the diameter of the Magnus rotor at its end region of the rotor housing facing away from the collar of the first Magnus rotor.

[0050] The use of such collar elements (also called end disks or end plates) arranged at the ends of Magnus rotors offers several advantages that improve the efficiency and performance of these rotors.

[0051] ...19 August 28, 2025

[0052] These collar elements reduce the induced drag (also known as "tip vortex") that forms at the rotor tips. Without them, a vortex forms at the ends of the rotating cylinder, disrupting the airflow and increasing overall drag. The collar elements weaken or eliminate this vortex, thereby reducing drag and increasing rotor efficiency. They also help maximize the Magnus effect by preventing or minimizing flow separation at the rotor tips. This results in a more uniform and stronger lift force along the entire length of the rotor, improving system effectiveness.

[0053] The airflow around a Magnus rotor can be stabilized by the collar elements, resulting in a more uniform force distribution. This not only leads to higher efficiency but can also reduce vibrations and other dynamic problems that could be caused by uneven airflow. Since drag is reduced and lift is maximized, less energy is required to operate the rotor while maintaining the same power output. This results in higher energy efficiency for the entire system, which is particularly important in applications such as marine propulsion.

[0054] Since the use of such collar elements reduces the dynamic loads and vibrations on the rotor, wear on mechanical parts can be reduced, leading to a longer service life of the rotors and the associated mechanisms.

[0055] The invention will be explained in more detail below with the aid of figures. These show:

[0056] Fig. 1a is a schematic representation of a Magnus rotor arrangement according to the invention in an extended operating position,

[0057] Fig. 1b is a schematic representation of the Magnus rotor arrangement from Fig. 1a in a retracted operating position,

[0058] ... / 10 August 28, 2025

[0059] Fig. 2a shows a schematic representation of a Magnus rotor arrangement according to the invention in an extended operating position,

[0060] Fig. 2b is a schematic representation of the Magnus rotor arrangement from Fig. 2a in a retracted operating position,

[0061] Fig. 3a shows a schematic representation of a Magnus rotor arrangement according to the invention in an extended operating position,

[0062] Fig. 3b is a schematic representation of the Magnus rotor arrangement from Fig. 3a in a retracted operating position,

[0063] Fig. 4a shows a schematic representation of a Magnus rotor arrangement according to the invention in an extended operating position, and

[0064] Fig. 4b is a schematic representation of the Magnus rotor arrangement from Fig. 4a in a retracted operating position.

[0065] Fig. 1a shows a Magnus rotor arrangement 10 according to the invention with two Magnus rotors 12 (designated 12a and 12b for better differentiation) which are mounted on a support shaft 14. The support shaft 14 consists of two shaft segments 16 (designated 16a and 16b for better differentiation).

[0066] The Magnus rotor assembly 10 in the present example has two rotors 12a and 12b. Rotor 12a is the lower part, rotor 12b is the upper part. Rotor 12b has an inner diameter that is slightly larger than the outer diameter of rotor 12a. Both rotors 12a and 12b are mounted at their upper ends on the support shaft 14. The support shaft 14, which is also called the rotor shaft, is shown as a tube in the figures.

[0067] In the present example, the Magnus rotor assembly 10 is arranged vertically. An inclined or horizontal arrangement is also conceivable. A first axle segment 16a is attached to a foundation 24 at its lower end. For example, a structure of this type could be installed on a ship, particularly a container ship.

[0068] ... / ll August 28, 2025

[0069] At its lower end, the support axis 14 is fixed at the installation site, for example to a ship's hull, by means of a foundation 24. The upper axis segment 16b can be extended telescopically from the lower axis segment 16a. Extension can be achieved using hydraulic cylinders or spindles, racks, or chains / cables. Such extension mechanisms are known from the prior art and are therefore not described in detail.

[0070] An upper axle segment 16b is slidably mounted in the lower axle segment 16a. In the operating position shown in Fig. 1a, the upper axle segment is fully extended and its lower end is attached to the upper end of the lower axle segment 16a. This attachment is achieved by means of a locking device 18, which is shown only schematically in the figures.

[0071] The extended telescopic section 16b of the support axis 14 can be held without play, at least in the extended end position, by the locking device 18, which can be designed, for example, as a clamping or blocking device. Locking or jamming in an intermediate position can also be provided.

[0072] As previously explained, the locking device 18 can be implemented using clamps, locking bolts, screw closures, clamps, or the like. In the case of telescoping tubes, as indicated here, it can be provided, for example, that the outer tube (here, lower axle segment 16a) is reduced in diameter by means of one or, preferably, several clamps, so that it holds the inner tube (here, upper axle segment 16b) in position by frictional engagement. For this purpose, the outer tube can, for example, have one or more longitudinal slots that facilitate a change in diameter when radial forces are applied, for example, by means of clamps. Pipe or rod fixings of this or a similar type, which can be used for the locking device 18 and with which two axle segments can be fastened together, are well known from the prior art, and therefore a more detailed explanation is omitted.

[0073] A rubber layer can be arranged beneath the locking device 18, which may be formed, for example, by means of clamps, and which acts as a damping device. Such a

[0074] ,.. / 12 28 August 2025

[0075] The damping device can compensate for vibrations or oscillations acting on the Magnus rotor assembly 10 in a damping manner, thus reducing material fatigue and wear.

[0076] In the present example, the two Magnus rotors 12a, 12b are each mounted on an axle segment 16a, 16b by means of a rotary bearing 22. It is schematically indicated that this rotary bearing 22 can be designed as a ball bearing. The Magnus rotors 12a, 12b are thus rotatably mounted on the axle segments 16a, 16b. In this case, the two Magnus rotors 12 can rotate independently of each other. That is, each rotor can rotate at an individual speed around the support axis 14, which consists of the two axle segments 16a, 16b. Particularly for use on a ship, where the Magnus rotor assembly 10 is intended to generate additional propulsion, it is planned to drive the Magnus rotors 12 by means of one or more drives. Since the Magnus rotors 12 are mounted to rotate independently of each other, it is possible to design the individual Magnus rotors 12 to be driven at individually predefinable speeds.

[0077] As explained, the two rotors 12a and 12b can be driven together or individually. A joint drive is possible, for example, by means of a telescopic drive shaft. Individual drives can be installed, for example, in the spaces between the bearings 22. Drive mechanisms of this or a similar type, usable for the Magnus rotors, with which the Magnus rotors 12 can be driven individually or together, are known from the prior art, and therefore a more detailed explanation is omitted.

[0078] A collar element 20a is arranged at the lower end of the lower Magnus rotor 12a, projecting radially beyond the diameter of the Magnus rotor 12a at an angle of preferably 90°. Similarly, a collar element 20b is arranged at the upper end of the upper Magnus rotor 12b, also projecting radially beyond the diameter of the Magnus rotor 12b at an angle of preferably 90°. These collar elements 20a, 20b improve the aerodynamic properties of the Magnus rotors and increase the efficiency of the rotor assembly.

[0079] ,.. / 13 August 28, 2025

[0080] Figure 1b shows the Magnus rotor assembly from Fig. 1a in a retracted operating position. It is clearly visible how the Magnus rotors 12a and 12b are shifted inside one another. The upper rotor 12b has largely enclosed the lower rotor 12a within its interior. The upper axle segment 16b is immersed in the lower axle segment 16a. In this retracted operating position, the locking device can be used to secure the axle segments 16 against each other and thus the Magnus rotor assembly 10 in a stowed position.

[0081] Figures 2a and 2b show a Magnus rotor arrangement 10 with three Magnus rotors 12a, 12b and 12c. In contrast to the embodiment shown in Figures 1a and 1b, three rotors 12 and three shaft segments 16 are used here. Otherwise, the construction is analogous to the embodiment shown in Figures 1a and 1b.

[0082] It is clearly visible that the middle rotor 12b does not have a collar element 20. Only the upper rotor 12c and the lower rotor 12a each have a collar element 20b, 20a at their upper and lower ends, respectively.

[0083] Figure 2b clearly shows how compactly the Magnus rotor arrangement 10 can be retracted into a stow position even when using several Magnus rotors 12.

[0084] Figures 3a and 3b show a Magnus rotor arrangement 10 with a single Magnus rotor 12. In contrast to the example shown in Figures 2a and 2b, only a single rotor 12 is used here. Otherwise, the construction is analogous to the embodiment shown in Figures 2a and 2b.

[0085] The individual rotor section 12 is rotatably mounted on the upper axle segment 16c. The rotor 12 can thus be raised by shifting several axle segments 16b, 16c. This can be done, for example, to allow this rotor section to operate in an undisturbed wind zone when there are deck cargoes on a ship. Similarly, in a Magnus rotor arrangement 10 with multiple rotor sections 12, several rotors 12 can be raised over a deck cargo or another object located in the installation area.

[0086] ,.. / 14 August 28, 2025

[0087] Without further ado and without being limited to this example, it is also possible to use more than three axle segments 16. For example, a greater height can thus be achieved. Magnus rotor arrangements 10 with more than one rotor can also have several axle segments 16 on which no rotor 12 is mounted.

[0088] Furthermore, it can be seen in Figures 3a and 3b that—unlike in the examples in Figures 1 and 2—the diameter of the axle segments decreases from top to bottom. Independently of the example in Figures 3a and 3b, the diameters of the axle segments 16 can therefore increase or decrease from top to bottom. The same applies to the diameters of the rotors 12. Nesting can thus occur from top to bottom by overlapping or immersing. A combination is also conceivable. For example, an axle segment 16 and / or a rotor 12 positioned centrally along the longitudinal axis 14 can have the largest diameter and surround the remaining axle segments 16 and rotors 12, respectively.

[0089] Figures 4a and 4b show an example of a Magnus rotor assembly 10 with six rotors 12. This example indicates that, with a suitable number and size of rotors 12, the residual height of the Magnus rotor assembly 10 in the retracted operating position can be particularly low. The number and size of the rotors 12 and the axle segments 16 are adapted to the conditions at the installation site and the intended use.

[0090] It is also conceivable that – as indicated in Fig. 4b – a cavity is provided below the foundation 24. The axle segments 16 could then have a greater length than the height of the rotors 12 and, in the retracted operating position of the arrangement 10 according to the invention, would be immersed in the cavity.

[0091] ,.. / 15 28 August 2025

[0092] REFERENCE MARK LIST

[0093] 10 Magnus rotor arrangement

[0094] 12 Magnus rotor

[0095] 14 Load-bearing axle

[0096] 16 axle segments

[0097] 18 locking devices

[0098] 20 collar elements

[0099] 22 swivel bearings

[0100] 24 Foundation

Claims

August 28, 2025 REQUIREMENTS 1. Magnus rotor arrangement (10) comprising at least one Magnus rotor (12) mounted on a support axis (14), characterized in that the support axis (14) comprises at least one first and one second axis segment (16a, 16b) which are designed to be displaceable relative to each other.

2. Magnus rotor arrangement (10) according to claim 1, characterized in that the first and the second axle segment are designed to be displaceable relative to each other in such a way that the support axle (14) is length-adjustable, in particular telescopic, by means of displacement of the axle segments (16a, 16b).

3. Magnus rotor arrangement (10) according to claim 1 or 2, characterized in that the Magnus rotor arrangement (10) has at least two, preferably more than two Magnus rotors (12), wherein at least one Magnus rotor (12) is displaceable by means of displacement of an axis segment (16a, 16b) relative to an end region of the support axis (14).

4. Magnus rotor arrangement (10) according to one of the preceding claims, characterized in that the Magnus rotor arrangement (10) has at least two, preferably more than two Magnus rotors (12), and wherein at least two Magnus rotors (12) are designed such that they are at least partially slidable into one another.

5. Magnus rotor arrangement (10) according to one of the preceding claims, characterized in that at least one of the Magnus rotors (12) is rotatably mounted on the support axis (14).

6. Magnus rotor arrangement (10) according to one of the preceding claims, characterized in that the Magnus rotor arrangement (10) comprises at least two, preferably more than two Magnus rotors (12), and wherein two or more than two of the ...12 August 28, 2025 Magnus rotors (12) are mounted on the support axis (14) so ​​as to be rotatable independently of each other.

7. Magnus rotor arrangement (10) according to one of the preceding claims, characterized in that the Magnus rotor arrangement (10) comprises a locking device (18a, 18b) by means of which the first axis segment (16a) and the second axis segment (16b) can be locked against displacement.

8. Magnus rotor arrangement (10) according to one of the preceding claims, characterized in that the locking device (18a, 18b) has a damping device by means of which vibrations acting on the axle segments (16a, 16b) can be damped.

9. Magnus rotor arrangement (10) according to one of the preceding claims, characterized in that the at least one or more of the Magnus rotors (12) are designed to be straight cylindrical, in particular straight circular cylindrical, or pyramidal, in particular tetrahedral, or prism-shaped, in particular cuboid.

10. Magnus rotor arrangement (10) according to one of the preceding claims, characterized in that a Magnus rotor (12) has at its end a first collar element (20a) projecting radially beyond the diameter of this Magnus rotor (12) in the longitudinal direction.

11. Magnus rotor arrangement (10) according to claim 10, characterized in that a Magnus rotor (12) has a second collar element (20b) extending radially beyond the diameter of this Magnus rotor (12) at its end in the longitudinal direction.

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