A mechanical boomerang launching device and method of use thereof

Abstract

The application provides a mechanical boomerang launching device and a use method thereof, and belongs to the technical field of boomerang launching. The launching device comprises a base, a rotating device, a boomerang body adapting device, a power output device and an angle adjusting device. The upper surface of the base is provided with a sliding rail, a descending groove and a buckle, and the lower surface is provided with a plurality of grooves at intervals. The grooves are matched with the angle adjusting device to realize the adjustment of the angle of the base. The rotating device is used to generate an angular velocity of the boomerang before launching. The boomerang body adapting device is used to install and limit the boomerang. The power output device is used to provide a linear velocity. The angle adjusting device is used to adjust the launching elevation angle and realize the accurate setting of the launching elevation angle. The application can significantly improve the rotation success rate, launching stability and safety of the boomerang through the mechanical control of the angular velocity, linear velocity and launching angle, and is suitable for test and competition occasions.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of boomerang launching, and relates to a mechanical boomerang launching device and a method for using the same, in particular to a launching mechanical device for improving the launching stability and the success rate of boomerang rotation and a method for using the same. BACKGROUND

[0002] As a historical hunting tool and a modern sports toy, the unique rotation flight trajectory of a boomerang depends on the accurate matching of the angular velocity and linear velocity at the time of launching. At present, the throwing of a boomerang generally relies on a human hand. This method is easily affected by subjective factors such as the posture of the thrower and the size of the force, resulting in unstable throwing angle, rotation speed and launch speed, low rotation success rate, unpredictable range and hit rate, and safety hazards caused by out-of-control trajectory.

[0003] In order to realize the mechanization and standardization of throwing, some launching devices have appeared in the prior art. For example, Chinese invention patent CN117207242B discloses a launching device using friction belt driving. The launching device drives the launching belt to move quickly by a driving member, and uses friction to give the launching ring and other objects a stable and controllable forward linear velocity. The device effectively improves the inconsistency of the linear velocity in the hand-throwing method. However, such devices have obvious limitations: they cannot actively give and accurately control the angular velocity required by the launched object, and a boomerang lacking controllable angular momentum cannot achieve rotation flight.

[0004] Further, in the field related to rotary launching, Chinese invention patent CN107398909B discloses a flying disc launching robot. The device gives the flying disc a linear velocity and makes it rotate at the same time through the friction between the rotating disc and the arc-shaped track. This proves that it is feasible to provide angular velocity for a flat projectile by a mechanical solution. However, the device has the following inherent defects: first, the angular velocity and the linear velocity are both derived from the same friction pair, resulting in serious coupling between the two and making them unable to be controlled independently, which greatly limits the accurate programming and adjustment of the launching trajectory. Second, its mechanical structure (such as the arc-shaped track) is customized for a specific shape of flying disc, lacks a universal adaptation mechanism, and cannot quickly and reliably install and position boomerangs of different shapes, sizes and centers of gravity, limiting its practicality. Finally, the adjustment of the launching angle relies on the complex movement of the entire gimbal mechanism, and lacks an independent angle adjustment mechanism that is optimized for the launching trajectory, simple in structure and can be accurately fine-tuned.

[0005] In summary, the mechanical launching device in the prior art has systematic deficiencies in the boomerang launching field: they cannot provide controllable angular velocity, or the angular velocity and linear velocity coupling cannot be independently adjusted, and there are generally poor adaptability, inaccurate release control, and insufficiently simple and accurate launching angle adjustment. Therefore, the market urgently needs a special boomerang launching device that can systematically solve all the above problems, achieve multi-model adaptation, independently controllable rotational speed and launching speed, accurate release timing, and accurate repeated setting of the launching angle. SUMMARY

[0006] In view of the problems in the prior art, the present application provides a mechanical boomerang launching device and its use method, which realizes accurate control of the angular velocity, linear velocity, launching angle and release time of the boomerang through a mechanical device, thereby improving the success rate, launching stability and safety of the boomerang rotation.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] A mechanical boomerang launching device, comprising a base, a sliding rail, a descending groove, a buckle, a rotating device, a boomerang fitting device, a power output device, and an angle adjustment device. The upper surface of the base is provided with a sliding rail, a descending groove and a buckle, and the lower surface of the base is provided with a plurality of grooves along the horizontal direction, which cooperate with the angle adjustment device to adjust the angle of the base. The rotating device comprises a rotating platform, a motor and a sliding plate, which is used to generate angular velocity for the boomerang before launching. The boomerang fitting device comprises a limiting column and a sliding block, which is used to install and limit the boomerang. The power output device comprises a spring and a baffle, which is used to provide linear tension. The angle adjustment device comprises a base plate, an extendable support plate and a micro-angle adjustment mechanism, which is used to adjust the launching elevation angle and realize accurate setting of the launching elevation angle.

[0009] Further, the sliding rail, the descending groove and the buckle on the upper surface of the base are specifically:

[0010] The sliding rail is provided with a sliding groove, which is used to cooperate with the sliding plate and limit the movement of the sliding plate.

[0011] The shape of the descending groove matches the outer contour of the sliding block, ensuring that only the limiting column and the sliding block fall during launching. The bottom surface of the descending groove is always higher than the spring, avoiding the influence of the spring on the falling of the sliding block.

[0012] The buckle is used to pre-fix the sliding plate in the preparation state.

[0013] Further, in the boomerang fitting device:

[0014] The slider is a hollow ring structure that can slide on the slide rail groove. A motor for the rotating device is installed in the hollow interior. The top of the slider is equipped with a limiting post adapted to different boomerang models.

[0015] The limiting post in the dart body adapter is connected to the top of the slider by a threaded or quick-release structure. The dart body adapter can adapt to boomerangs of different shapes and sizes by changing the position and number of the limiting post.

[0016] The inner diameter of the slider is larger than the outer diameter of the motor to avoid jamming and ensure that the dart body adapter has sufficient linear velocity during launch.

[0017] Furthermore, in the rotating device:

[0018] The bottom of the motor is fixed to the slide plate, and the top of the motor is connected to the rotating platform via a shaft.

[0019] The upper surface of the rotating platform abuts against the lower surface of the boomerang to transmit angular velocity.

[0020] The rotating platform is disc-shaped with through holes along its circumference for the limit post to pass through. The diameter of the through holes is larger than the outer diameter of the limit post to ensure that the limit post is not disturbed by the rotating platform when it falls.

[0021] The bottom of the slide plate is equipped with ball bearings. The slide plate cooperates with the groove on the slide rail. The slide plate is constrained to move on the slide rail by the groove and the ball bearings reduce the friction of movement, thereby ensuring that the mechanical boomerang launching device has sufficient linear velocity.

[0022] Furthermore, in the power output device:

[0023] The baffle is fixed to one end of the upper surface of the base and connected to the end of the slide rail; the spring is located in the groove on the slide rail, with one end fixedly connected to the baffle and the other end connected to the slide plate of the rotating device, and the spring generates the required linear velocity.

[0024] The spring is located below the bottom of the descending groove and is used to release the boomerang's constraint when the slide moves into the descending groove. The depth of the descending groove ensures that the effective positioning height of the limiting post is lower than the contact surface height of the rotating platform after the slider falls. Furthermore, in the angle adjustment device, one end of the base plate is connected to the bottom end of the base via a first hinge; the other end of the base plate is connected to the retractable support plate via a second hinge, and the retractable support plate is equipped with a micro-angle adjustment mechanism with locking. Specifically:

[0025] The angle adjusting device comprises a bottom plate, a telescopic support plate and a micro-angle adjusting mechanism, the telescopic support plate is provided with an adjusting gear and a lock catch, and is used for realizing coarse adjustment and telescoping. The micro-angle adjusting mechanism comprises a triangular angle adjusting block, a fine-toothed screw and a nut, and is used for fine adjustment and locking of the launching angle. The telescopic support plate realizes coarse adjustment and telescoping through the adjusting gear and the lock catch, the micro-angle adjusting mechanism is located between the contact end face of the groove of the bottom surface of the telescopic support plate and the bottom plate, and is used for fine adjustment and locking after coarse adjustment. The micro-angle adjusting mechanism is preferably composed of two symmetrical triangular angle adjusting blocks, the two triangular angle adjusting blocks are relatively adjusted through the fine-toothed screw, and the fine-toothed screw fixes the triangular angle adjusting blocks after locking through the nut, so that the angle of the triangular angle adjusting blocks is unchanged;

[0026] Further, the lower surface of the boomerang is in contact with the upper surface of the rotating platform, and is fixed in position by the limiting column, and the angular velocity and linear velocity are obtained through the spring and the motor.

[0027] Further, the slider of the boomerang adapter device moves on the upper surface of the slide rail, falls into the descending groove during launching, drives the boomerang adapter device to move downward after falling, and then the upper surface height of the limiting column is less than the upper surface height of the rotating platform relative to the base, so that the boomerang is normally launched.

[0028] A use method of a mechanical boomerang launching device, the use method comprising the following steps:

[0029] Firstly, the boomerang is installed on the upper surface of the rotating platform and the position of the limiting column is adjusted; the angle adjusting device is used to set the required launching elevation angle and lock the nut;

[0030] Secondly, the motor is started, the rotating platform drives the boomerang to generate angular velocity, when the motor rotates stably and safety is confirmed, the buckle is released, and the spring pulls the slide plate to move forward;

[0031] Finally, when the slider moves to the position of the descending groove, the slider and the limiting column fall from the descending groove, at the same time, the limiting column is separated from the limitation of the boomerang, the boomerang is separated from the rotating platform under the condition of having linear velocity and angular velocity, and flies out along the predetermined trajectory.

[0032] Compared with the existing hand launching or simple launching device, the present application has the following beneficial effects:

[0033] (1) The present application actively drives the angular velocity of the boomerang and combines with controllable linear propulsion;

[0034] (2) The present application can significantly improve the initial angular velocity and linear velocity of the boomerang, thereby improving the stability of the boomerang;

[0035] (3) The present application realizes repeatable test and competition application of different distances and trajectories through adjustable angular velocity and linear velocity and launching angle;

[0036] (4) The application improves safety (maximum energy can be set, mechanical baffle, start-stop interlock);

[0037] (5) The application has good maintainability and multi-model adaptability (limiting column can be replaced). BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a schematic diagram of the overall structure.

[0039] Figure 2 is a schematic diagram of the side view.

[0040] Figure 3 is a schematic diagram of the dart fitting device.

[0041] Figure 4 is a schematic diagram of the rotating device.

[0042] Figure 5 is a schematic diagram of the angle adjusting device.

[0043] In the figure: 1 base; 2 slide rail; 3 descending groove; 4 buckle; 5 rotating device; 6 dart fitting device; 7 spring; 8 baffle; 9 first hinge; 10 angle adjusting device; 11 boomerang; 12 groove; 13 second hinge;

[0044] 51 rotating platform; 52 motor; 53 slide plate; 54 ball bearing;

[0045] 61 limiting column; 62 sliding block;

[0046] 101 base plate; 102 telescopic support plate; 103 micro-angle adjusting mechanism;

[0047] 1021 adjusting gear; 1022 lock catch;

[0048] 1031 triangular angle adjusting block; 1032 fine tooth screw; 1033 nut. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and beneficial effects of the application more clear, several embodiments of the application will be further described below in combination with the drawings, but the application is not limited thereto.

[0050] A mechanical boomerang launching device, the schematic diagram of the overall structure is shown in Figure 1 , the schematic diagram of the side view is shown in Figure 2As shown, including the base 1, slide rail 2, down groove 3, buckle 4, rotating device 5, dart body adapter 6, power output device, angle adjusting device 10. The upper surface of the base 1 is provided with slide rail 2, down groove 3 and buckle 4, the lower surface of the base 1 is provided with a plurality of grooves 12 along the horizontal direction, the groove 12 is matched with the angle adjusting device 10, the angle of the base 1 is adjusted. The rotating device 5 includes rotating platform 51, motor 52, slide plate 53, which is used to generate angular velocity before launching; the dart body adapter 6 includes limiting column 61, sliding block 62, which is used to install and limit the boomerang 11; the power output device includes spring 7 and baffle 8, which is used to provide linear tension; the angle adjusting device 10 includes bottom plate 101, telescopic support plate 102 and micro angle adjusting mechanism 103, which is used to adjust the launch angle and realize the accurate setting of the launch angle. Specifically:

[0051] The base 1: the steel plate or aluminum alloy frame structure is used as the whole machine rigidity reference. The upper surface of the base 1 is provided with slide rail 2 and down groove 3, and the lower surface of the base 1 is provided with grooves 12 along the horizontal direction to cooperate with the angle adjusting device 10. In this embodiment, the flatness of the upper surface of the base 1 relative to the horizontal plane is less than 0.5mm / m.

[0052] The slide rail 2 and the sliding groove: the slide rail 2 is a linear guide rail (long strip), and the sliding groove is processed on the surface or side of the slide rail 2 as the guide groove of the slide plate 53. The sliding groove and the slide plate 53 are matched to leave a radial gap of 0.5-1.5mm (1.0mm in this embodiment), and the axial gap ensures the stroke. The material of the slide rail 2 is hardened steel or anodized aluminum (hardened steel is selected in this embodiment) and is matched with a lubrication groove. The length of the slide rail 2 is determined according to the overall size of the launching device, and the common experimental table type is 200-500mm.

[0053] The slide plate 53: it is a bearing plate moving linearly along the slide rail 2, and the bottom is provided with a ball bearing 54 to reduce friction.

[0054] The rotating device 5 as shown: Figure 4 The motor 52 is fixed on the slide plate 53, the motor shaft is coaxially connected with the rotating platform 51, and the rotating platform 51 is disc-shaped (diameter 20-80mm, determined according to the size of the boomerang 11). The disc surface of the rotating platform 51 is used to contact the lower surface of the boomerang 11 and transmit angular velocity; the center of the disc surface is symmetrically provided with a through hole, and the hole diameter is larger than the outer diameter of the limiting column 61 by 0.5-1.5mm (1.0mm in this embodiment), so as to ensure that the limiting column 61 is not interfered by the rotating platform 51 when falling.

[0055] The dart body adapter 6 as shown: Figure 3As shown: slider 62 is a ring-shaped hollow structure, which is sleeved on the motor 52 and the rotating platform 51 and slides along the slide rail 2. The inner diameter of the slider 62 is 0.5-2.0mm larger than the outer diameter of the motor (1.0mm in this embodiment), so as to avoid jamming and take into account the force transmission. The slider 62 is provided with a mounting hole of a limiting column 61, and the limiting column 61 is a bolt structure with adjustable height. The material of the limiting column and the contact surface should use wear-resistant bushing or sleeve for replacement.

[0056] The descending groove 3: the descending groove 3 is an open groove on the base 1, and the outer contour matches the outer contour shape of the slider 62 to realize positioning. In order to ensure the release reliability, the bottom surface of the descending groove 3 should be 5-25mm higher than the top surface of the spring 7 (10mm in this embodiment) relative to the installation position of the spring 7, that is, the bottom surface of the descending groove 3 is higher than the highest position of the spring 7, so as to ensure that the slider 62 is not interfered by the spring 7 in the radial or axial direction when entering the descending groove 3. The depth of the descending groove 3 should meet the effective positioning height of the limiting column 61 after the slider 62 falls, which is lower than the contact surface height of the rotating platform 51.

[0057] The power output device: one end of the spring 7 is fixed to the baffle 8 (the baffle is fixed to the end of the base 1), and the other end is fixed to the slide plate 53. In order to be safe and convenient to adjust, the pre-load and free travel of the spring 7 should be adjustable (for example, by adjusting the pre-pressing baffle). In order to realize the adjustable linear velocity, the range of the spring constant k or the pre-pressing x should cover the expected energy demand.

[0058] The buckle 4: the buckle 4 is arranged at the initial position of the slide plate 53 to mechanically lock the slide plate and serve as a safety interlocking point of the launching trigger.

[0059] The angle adjusting device 10 is as shown in the figure Figure 5 As shown: one end of the bottom plate 101 is connected to the bottom end of the base 1 through the first hinge 9; the other end of the bottom plate 101 is connected to the telescopic support plate 102 through the second hinge 13, and the telescopic support plate 102 is provided with a micro-angle adjusting mechanism 103 with a lock. Specifically:

[0060] The telescopic support plate 102 is provided with an adjusting gear 1021 and a lock catch 1022 for realizing coarse adjustment and telescoping. The micro-angle adjusting mechanism 103 comprises a triangular angle adjusting block 1031, a fine-toothed screw 1032 and a nut 1033 for fine adjustment and locking of the launching angle. The telescopic support plate 102 realizes coarse adjustment and telescoping through the adjusting gear 1021 and the lock catch 1022, and the micro-angle adjusting mechanism 103 is located between the contact end face of the telescopic support plate 102 and the groove 12 of the lower surface of the base 1, for fine adjustment and locking after coarse adjustment. The micro-angle adjusting mechanism 103 preferably comprises two symmetrical triangular angle adjusting blocks 1031, which are adjusted in opposite directions by the fine-toothed screw 1032, and the fine-toothed screw 1032 fixes the triangular angle adjusting blocks 1031 after locking by the nut 1033, so that the angle of the triangular angle adjusting blocks 1031 is fixed.

[0061] The embodiment provides a use method of the mechanical boomerang launching device, and the use method comprises the following steps:

[0062] In the first step, the boomerang 11 is placed on the rotating platform 51, the position and height of the limiting column 61 are adjusted, it is confirmed that the boomerang 11 is in good contact with the rotating platform 51 and the limiting column 61 is fixed, the angle adjusting device 10 is adjusted to a target launching elevation angle, coarse adjustment is performed first, and then fine adjustment is performed by the micro-angle adjusting mechanism 103, and the nut 1033 is locked;

[0063] In the second step, the motor 52 is started, and the buckle 4 is unlocked when the angular velocity of the motor 52 is stable; the spring 7 releases energy to pull the sliding plate 53 to move forward, the sliding plate 53 drives the sliding block 62 to move forward, and the sliding block 62 is provided with low-friction sliding by the ball 54;

[0064] In the third step, when the sliding block 62 moves to the descending groove 3, the sliding block 62 and the limiting column 61 vertically fall (gravity) at the descending groove, so that the limiting column 61 is released from the constraint on the boomerang 11; at this time, the boomerang 11 is separated from the rotating platform 51 under the condition of the angular velocity and the linear velocity provided by the spring, and flies out along the predetermined trajectory.

[0065] In the embodiment, the boomerang is a two-wing boomerang, the weight is 5.6 g, the blade length is 150 mm, the angular velocity is 18 rad / s, the linear velocity is 12 m / s, and the launching angle is 60°.

[0066] The above-described embodiments only express the implementation manners of the present application, but cannot be understood as the limitation on the scope of the present application, and it should be pointed out that, for the person skilled in the art, without departing from the concept of the present application, a plurality of modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. A mechanical boomerang launching device, characterized in that, The mechanical boomerang launching device includes a base (1), a slide rail (2), a descending groove (3), a buckle (4), a rotating device (5), a boomerang body adapter (6), a power output device, and an angle adjustment device (10). The upper surface of the base (1) is provided with a slide rail (2), a descending groove (3) and a buckle (4), and the lower surface of the base (1) is provided with multiple grooves (12) spaced apart. The grooves (12) cooperate with the angle adjustment device (10) to realize the angle adjustment of the base (1); the rotating device (5) includes a rotating platform (51), a motor (52) and a sliding plate (53) to generate angular velocity before the boomerang is launched; the boomerang body adapter (6) includes a limiting post (61) and a slider (62) to install and limit the boomerang (11); the power output device includes a spring (7) and a baffle (8) to provide linear tension; the angle adjustment device (10) is used to adjust the launch elevation angle to realize the precise setting of the launch elevation angle.

2. The mechanical boomerang launching device according to claim 1, characterized in that, The slide rail (2), descending groove (3), and buckle (4) on the upper surface of the base (1) are specifically as follows: The slide rail (2) is provided with a groove for cooperating with the slide plate (53) and restricting the movement of the slide plate (53); The shape of the descending groove (3) matches the outline of the slider (62) to ensure that the positioning post (61) and the slider (62) fall off during launch; The buckle (4) is used to pre-fix the slide plate (53).

3. The mechanical boomerang launching device according to claim 1, characterized in that, In the dart body adapter (6): The slider (62) is a hollow ring structure that can slide on the slide groove of the slide rail (2). The motor (52) of the rotating device (5) is installed in the hollow part inside. The top of the slider (62) is provided with a limiting post (61) that is compatible with different models of boomerangs (11). The limiting post (61) in the dart body adapter (6) is connected to the top of the slider (62) by a thread or quick-release structure. The dart body adapter (6) can adapt to boomerangs (11) of different shapes and sizes by changing the position and number of the limiting post (61). The inner diameter of the slider (62) is larger than the outer diameter of the motor (52).

4. The mechanical boomerang launching device according to claim 1, characterized in that, In the rotating device (5): The bottom of the motor (52) is fixed on the slide plate (53), and the top of the motor (52) is connected to the rotating platform (51) via a shaft; The upper surface of the rotating platform (51) abuts against the lower surface of the boomerang (11) to transmit angular velocity; The rotating platform (51) is disc-shaped and has through holes along its circumference for passing through the limiting post (61). The diameter of the through holes is larger than the outer diameter of the limiting post (61) to ensure that the limiting post (61) is not disturbed by the rotating platform (51) when it falls. The bottom of the skateboard (53) is provided with ball bearings (54).

5. A mechanical boomerang launching device according to claim 1, characterized in that, The baffle (8) in the power output device is fixed to one end of the upper surface of the base (1) and connected to the end of the slide rail (2); the spring (7) is located in the slide groove on the slide rail (2), one end of which is fixedly connected to the baffle (8) and the other end is connected to the slide plate (53) of the rotating device (5), and the required linear velocity is generated by the spring (7).

6. A mechanical boomerang launching device according to claim 5, characterized in that, The spring (7) is located below the bottom surface of the descending groove (3) and is used to release the constraint on the boomerang (11) when the slide plate (53) moves to the descending groove (3); the depth of the descending groove (3) is such that the effective positioning height of the limiting post (61) is lower than the contact surface height of the rotating platform (51) after the slider (62) falls.

7. A mechanical boomerang launching device according to claim 1, characterized in that, In the angle adjustment device (10), one end of the base plate (101) is connected to the bottom end of the base (1) via the first hinge (9); the other end of the base plate (101) is connected to the telescopic support plate (102) via the second hinge (13), and the telescopic support plate (102) is provided with a micro-angle adjustment mechanism (103) with locking.

8. A mechanical boomerang launching device according to claim 7, characterized in that, The angle adjustment device (10) includes a base plate (101), a retractable support plate (102), and a micro-angle adjustment mechanism (103). The retractable support plate (102) is equipped with an adjustment gear (1021) and a latch (1022) for coarse adjustment of the retraction. The micro-angle adjustment mechanism (103) includes a triangular adjustment block (1031), a fine-tooth screw (1032), and a nut (1033) for fine adjustment and locking of the firing angle. Specifically: The retractable support plate (102) achieves coarse adjustment and retraction through adjusting gear (1021) and latch (1022). The micro-angle adjustment mechanism (103) is located between the contact end face of the groove (12) on the lower surface of the base (1) of the retractable support plate (102) and the base (1), and is used for fine adjustment and locking after coarse adjustment. The micro-angle adjustment mechanism (103) consists of two symmetrical triangular angle adjustment blocks (1031), which adjust the angle relative to each other through a fine thread screw (1032). After the fine thread screw (1032) is locked by a nut (1033), the angle of the triangular angle adjustment block (1031) remains unchanged.

9. A mechanical boomerang launching device according to claim 1, characterized in that, The lower surface of the boomerang (11) is in contact with the upper surface of the rotating platform (51) and is fixed in position by the limiting post (61). The angular velocity and linear velocity are obtained by the spring (7) and the motor (52).

10. A method of using the mechanical boomerang launching device according to any one of claims 1-9, characterized in that, The method of use includes the following steps: First, install the boomerang (11) on the upper surface of the rotating platform (51) and adjust the position of the limit post (61); use the angle adjustment device (10) to set the required launch elevation angle and tighten the nut (1033); Next, start the motor (52), rotate the platform (51) to drive the boomerang (11) to generate angular velocity. When the motor (52) rotates stably and safety is confirmed, release the buckle (4), and the spring (7) pulls the slide plate (53) forward. Finally, when the slider (62) moves to the position of the descending groove (3), the slider (62) and the limiting post (61) fall from the descending groove (3), and at the same time the limiting post (61) is released from the restriction on the boomerang (11). The boomerang (11) leaves the rotating platform (51) with both linear velocity and angular velocity and flies out along the predetermined trajectory.

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