An airdrop attitude adjustment anti-inversion system and anti-inversion method

Abstract

The application provides an air-drop attitude adjusting anti-rollover system and an anti-rollover method, the system comprising a first unfolding device, a second unfolding device, a first rudder surface, a second rudder surface, a third rudder surface, a fourth rudder surface and a cargo board; the cargo board is used for mounting the first unfolding device, the second unfolding device and containing goods; the first rudder surface, the second rudder surface, the third rudder surface and the fourth rudder surface are respectively arranged on the outer sides of four peripheries of the goods and are flexible and capable of being twisted; the first unfolding device and the second unfolding device are symmetrically mounted on four edges of the cargo board, each unfolding device comprising a support, a rocker arm and an electric push rod; the electric push rod is capable of driving the rocker arm to swing up or down through extension and retraction, the unfolding device is used for driving the rudder surface to change the angle and shape, so that the rudder surface reaches the purpose of adjusting the air resistance, further reaches the purpose of adjusting the air-drop attitude, realizes air-drop landing along the length direction, and thus reduces the risk of rollover.

Description

Technical Field

[0001] This application belongs to the field of airdrop equipment technology, specifically relating to an airdrop attitude adjustment anti-tipping system and anti-tipping method. Background Technology

[0002] Airdrop primarily refers to the use of parachutes or other powered decelerators to drop cargo from a transport aircraft to a designated area. The landing process is cushioned by airbags. However, factors such as tumbling upon release, binding errors, uneven mass distribution, and airflow can cause changes in the airdrop's attitude during descent. Theoretical calculations show that the probability of an airdrop tipping over when landing along its length is lower than that when landing along its width. Therefore, a device needs to be designed to ensure the airdrop lands along its length to reduce the probability of tipping over. Summary of the Invention

[0003] To address the technical problems existing in the background art, this application provides an airdrop attitude adjustment anti-tipping system and anti-tipping method. By adjusting the deployment angle of the control surface, air resistance is adjusted, thereby adjusting the attitude of the airdrop during the airdrop process and enabling the airdrop to land along the length direction, thereby reducing the risk of tipping over.

[0004] Specifically, the first aspect of this application provides an airdrop attitude adjustment anti-tipping system, including a first deployment device, a second deployment device, a first control surface, a second control surface, a third control surface, a fourth control surface, and a cargo pallet;

[0005] The cargo pallet is used to install the first unfolding device, the second unfolding device, and to hold goods.

[0006] The first rudder surface, the second rudder surface, the third rudder surface, and the fourth rudder surface are respectively arranged on the outer periphery of the cargo, and all of them are flexible and can be twisted;

[0007] The first deployment device and the second deployment device are mirror-symmetrically installed on the four sides of the cargo plate and are used to drive the control surface to change its angle and shape, thereby adjusting the airflow resistance and thus adjusting the airdrop attitude.

[0008] As a further explanation of this application, the first deployment device and the second deployment device contain the same component structure and construction, the difference being that they are installed in a mirror-symmetric manner during assembly.

[0009] As a further explanation of this application, both the first deployment device and the second deployment device include a support, a rocker arm, and an electric push rod;

[0010] The bottom end of the support is fixed to the cargo plate, the upper end of the support side arm is rotatably connected to the upper end of the electric push rod, the lower end of the support side arm is rotatably connected to the lower end of the rocker arm, the lower end of the rocker arm is also rotatably connected to the lower end of the electric push rod, and the side of the rocker arm is fixedly connected to the corresponding short side of the rudder surface; by extending and retracting the electric push rod, the rocker arm can be driven to swing up or down.

[0011] A second aspect of this application provides an anti-tipping method for the aforementioned airdrop attitude adjustment anti-tipping system, comprising a deployment process of the deployment device and an airdrop attitude adjustment process:

[0012] The deployment process of the deployment device includes: at the beginning of the airdrop, the first, second, third, and fourth control surfaces are not deployed and are in the state of wrapping the cargo; after the airdrop is thrown away from the aircraft, under the action of the first and second deployment devices, all control surfaces are made parallel to the cargo pallet, thereby increasing the airdrop's frontal area, increasing air resistance, and reducing the airdrop's landing speed.

[0013] The airdrop attitude adjustment process includes: using the first and second deployment devices to drive the four control surfaces to change their angles and shapes respectively, forming a clockwise rotational torque around the airdrop's center of mass. The four torques are superimposed to make the airdrop rotate clockwise around its center of mass until the length direction coincides with the velocity direction; or forming a counterclockwise rotational torque around the airdrop's center of mass. The four torques are superimposed to make the airdrop rotate counterclockwise around its center of mass until the length direction coincides with the velocity direction; wherein, the velocity direction is the actual direction of airdrop movement, and the length direction is the direction parallel to the long side of the cargo pallet.

[0014] As a further explanation of this application, the deployment process of the deployment device specifically includes: at the beginning of the airdrop, the first, second, third, and fourth control surfaces are not deployed and are in the state of wrapping the cargo; after the airdrop is thrown away from the aircraft, all electric push rods retract, driving the rocker arm to swing down around the support, so that all control surfaces are parallel to the cargo plate, thereby increasing the airdrop's frontal area, increasing air resistance, and reducing the airdrop's landing speed.

[0015] As a further explanation of this application, the airdrop attitude adjustment process specifically includes: retracting the electric push rod of the first deployment device, driving the rocker arm to swing downwards around the support; extending the electric push rod of the second deployment device, driving the rocker arm to swing upwards around the support, causing the control surface to form a twisted shape. The relative airflow acting on the control surface will generate a force parallel to the control surface, thereby generating a clockwise rotational torque around the airdrop's center of mass. The other control surfaces work in the same way, all generating clockwise rotational torques around the airdrop's center of mass. The four torques are superimposed, causing the airdrop to rotate clockwise around its center of mass until the length direction coincides with the velocity direction; or,

[0016] Extend the electric push rod of the first deployment device to drive the rocker arm to swing upward around the support; retract the electric push rod of the second deployment device to drive the rocker arm to swing downward around the support, so that the control surface forms a twisted shape. The relative airflow acting on the control surface will generate a force parallel to the control surface, which in turn generates a rotational torque in the counterclockwise direction around the center of mass of the airdrop. The other control surfaces work in the same way, all generating a rotational torque in the counterclockwise direction around the center of mass of the airdrop. The four torques are superimposed, causing the airdrop to rotate counterclockwise around the center of mass until the length direction coincides with the velocity direction.

[0017] As a further explanation of this application, if tilting occurs during the airdrop landing process, the rocker arms around the cargo pallet can provide support and prevent tipping.

[0018] Other features and advantages of this technical solution will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the technical solution. The objectives and other advantages of this technical solution can be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0019] The technical solution of this invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present technical solution and form part of the specification. They are used together with the embodiments of the present technical solution to explain the present technical solution, but do not constitute a limitation thereof. In the accompanying drawings:

[0021] Figure 1 This is a diagram showing the overall collapse of an airdrop attitude adjustment and anti-tipping system provided in one embodiment of this application.

[0022] Figure 2 A fully unfolded diagram of the control surfaces of an airdrop attitude adjustment anti-tipping system provided in one embodiment of this application.

[0023] Figure 3 A structural diagram of the first deployment device of the airdrop attitude adjustment and anti-tipping system provided in one embodiment of this application.

[0024] Figure 4 An exploded view of the first deployment device of an airdrop attitude adjustment and anti-tipping system provided in one embodiment of this application.

[0025] Figure 5 This application provides an embodiment of an installation diagram of the deployment device for an airdrop attitude adjustment and anti-tipping system.

[0026] Figure 6 This application provides an embodiment of an airdrop attitude adjustment and anti-tipping system deployment device installation location diagram.

[0027] Figure 7A diagram showing the retraction of the electric push rod and the swing arm swinging down in an embodiment of the airdrop attitude adjustment and anti-tipping system provided in this application.

[0028] Figure 8 This application provides an embodiment of an airdrop attitude adjustment and anti-tipping system, which is shown in the airdrop ground contact support state diagram.

[0029] Figure 9 A schematic diagram of the rocker arm and support connection of an airdrop attitude adjustment and anti-tipping system provided in one embodiment of this application.

[0030] Figure 10 One embodiment of this application provides an airdrop attitude adjustment and anti-tipping system that adjusts the airdrop attitude counterclockwise.

[0031] Figure 11 One embodiment of this application provides an airdrop attitude adjustment and anti-tipping system that adjusts the airdrop attitude clockwise.

[0032] Reference numerals: support 1, rocker arm 2, electric push rod 3, first control surface 4, second control surface 5, third control surface 6, fourth control surface 7, cargo plate 8, cargo 9. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] The technical solution of this application will be explained below with reference to specific embodiments.

[0040] This application provides an airdrop attitude adjustment anti-tipping system, including a first deployment device, a second deployment device, a first control surface 4, a second control surface 5, a third control surface 6, a fourth control surface 7, and a cargo pallet 8;

[0041] The cargo pallet 8 is used to install the first unfolding device, the second unfolding device, and to hold the cargo 9;

[0042] The first rudder surface 4, the second rudder surface 5, the third rudder surface 6 and the fourth rudder surface 7 are respectively arranged on the outer sides of the cargo 9, and all of them are flexible and can be twisted;

[0043] The first and second deployment devices are mirror-symmetrically installed on the four sides of the cargo plate 8 and are used to drive the control surface to change its angle and shape, thereby adjusting the airflow resistance and thus adjusting the airdrop attitude.

[0044] The purpose of this application is to enable the airdrop to land along its length, thereby reducing the probability of the airdrop flipping. By adjusting the shape of the control surfaces, the airdrop attitude can be adjusted using air resistance. The deployment device also serves as a landing support and anti-flipping function. When the control surfaces are fully deployed, the air resistance of the airdrop can be increased, thereby reducing the landing speed of the airdrop.

[0045] Specifically, the first and second deployment devices contain identical components and structures, differing only in that they are installed in a mirror-symmetrical manner during assembly. Figure 5 and Figure 6 As shown.

[0046] Both the first and second deployment devices include a support 1, a rocker arm 2, and an electric push rod 3.

[0047] The bottom end of the support 1 is fixed on the cargo plate 8. The upper end of the side arm of the support 1 is rotatably connected to the upper end of the electric push rod 3. The lower end of the side arm of the support 1 is rotatably connected to the lower end of the rocker arm 2. The lower end of the rocker arm 2 is also rotatably connected to the lower end of the electric push rod 3. The side of the rocker arm 2 is fixedly connected to the short side of the corresponding rudder surface. The rocker arm 2 can be driven to swing up or down by extending and retracting the electric push rod 3.

[0048] like Figure 7 As shown, specifically, the electric push rod 3 can extend and retract to drive the rocker arm 2 to swing up or down. When the electric push rod 3 extends, the rocker arm 2 swings up; when the electric push rod 3 retracts, the rocker arm 2 swings down.

[0049] In some implementations, such as Figure 9 As shown, the short side of the rudder surface has bolt holes for connecting the rocker arm 2, and the support 1 has bolt holes for connecting the cargo plate 8.

[0050] In some implementations, such as Figure 4 As shown, the electric push rod 3 has a round hole at its upper end, which passes through the horizontal shaft at the upper end of the support 1, allowing the electric push rod 3 to rotate around the horizontal shaft of the support 1. The electric push rod 3 also has a horizontal shaft at its lower end, which passes through the through hole of the rocker arm 2, allowing the rocker arm 2 to rotate around the horizontal shaft of the electric push rod 3. A second horizontal shaft at the lower end of the support 1 passes through another through hole in the rocker arm 2, supporting the rocker arm 2 and allowing it to rotate around it. The bottom of the support has a through hole for connecting and fixing to the cargo plate 8 with bolts.

[0051] The anti-tipping method of the aforementioned airdrop attitude adjustment anti-tipping system includes the deployment process of the deployment device and the airdrop attitude adjustment process:

[0052] The deployment process includes: at the beginning of the airdrop, the first control surface 4, the second control surface 5, the third control surface 6, and the fourth control surface 7 are not deployed and are in the state of wrapping the cargo 9; after the airdrop is thrown away from the aircraft, under the action of the first and second deployment devices, all control surfaces are made parallel to the cargo plate 8, thereby increasing the airdrop's frontal area, increasing air resistance, and reducing the airdrop's landing speed.

[0053] The airdrop attitude adjustment process includes: the first and second deployment devices drive the four control surfaces to change their angles and shapes respectively, forming a clockwise rotational torque around the airdrop's center of mass. The four torques are superimposed, causing the airdrop to rotate clockwise around its center of mass until the length direction coincides with the velocity direction; or forming a counterclockwise rotational torque around the airdrop's center of mass. The four torques are superimposed, causing the airdrop to rotate counterclockwise around its center of mass until the length direction coincides with the velocity direction; wherein, the velocity direction is the actual direction of airdrop movement, and the length direction is the direction parallel to the long side of the cargo pallet.

[0054] like Figure 1 As shown, the deployment process of the deployment device specifically includes: initially, the first control surface 4, the second control surface 5, the third control surface 6, and the fourth control surface 7 are not deployed, remaining in a state of wrapping the cargo 9; after the airdrop is thrown from the aircraft, all electric push rods 3 retract, driving the rocker arm 2 to swing downwards around the support 1 until the first control surface 4, the second control surface 5, the third control surface 6, and the fourth control surface 7 are all parallel to the cargo plate 8. This posture increases the airdrop's frontal area, increases air resistance, and can reduce the airdrop's landing speed, such as... Figure 2 As shown.

[0055] like Figure 11 As shown, during the descent of the airdrop, the airflow moves upward relative to the airdrop. If the airdrop needs to rotate clockwise, a clockwise rotational torque around the center of mass needs to be applied to the airdrop. Through force analysis and fluid simulation analysis, the first control surface 4, the second control surface 5, the third control surface 6, and the fourth control surface 7 form the shape shown in the figure, which can generate a clockwise rotational torque around the center of mass.

[0056] The velocity direction refers to the actual direction of the airdrop's movement. The length direction refers to the direction parallel to the long side of the airdrop pallet.

[0057] By controlling the airdrop to rotate so that its length direction is aligned with its heading for landing, the probability of the airdrop overturning can be effectively reduced.

[0058] The control method is as follows: if the length direction is to the left of the speed direction, control the airdrop to rotate clockwise until the length direction coincides with the speed direction; if the length direction is to the right of the speed direction, control the airdrop to rotate counterclockwise until the length direction coincides with the speed direction.

[0059] Taking the first rudder surface 4 as an example, such as Figure 11As shown, the airdrop attitude adjustment process specifically includes: retracting the electric push rod 3 of the first deployment device, driving the rocker arm 2 to swing downwards around the support 1; extending the electric push rod 3 of the second deployment device, driving the rocker arm 2 to swing upwards around the support 1, causing the control surface to form a twisted shape. The relative airflow acting on the control surface will generate a force F1 parallel to the control surface 4 to the left, thereby generating a rotational torque in the clockwise direction around the airdrop's center of mass. The remaining second control surface 5, third control surface 6, and fourth control surface 7 operate in the same way, all generating a rotational torque in the clockwise direction around the airdrop's center of mass. The four torques are superimposed, causing the airdrop to rotate clockwise around its center of mass until the length direction coincides with the velocity direction.

[0060] Similarly, if a counter-clockwise rotation is required for airdropping, taking the first control surface 4 as an example, such as... Figure 10 As shown, the electric push rod 3 of the first deployment device is extended, driving the rocker arm 2 to swing upward around the support 1; the electric push rod 3 of the second deployment device is retracted, driving the rocker arm 2 to swing downward around the support 1, causing the control surface 4 to form a twisted shape. The relative airflow acting on the control surface will generate a force F1 parallel to the right of the control surface 4, thereby generating a rotational torque in the counterclockwise direction around the center of mass of the airdrop. The other second control surface 5, third control surface 6, and fourth control surface 7 work in the same way, all generating a rotational torque in the counterclockwise direction around the center of mass of the airdrop. The four torques are superimposed, causing the airdrop to rotate counterclockwise around the center of mass until the length direction coincides with the velocity direction.

[0061] like Figure 8 As shown, if the airdrop tilts during the landing process, the eight rocker arms 2 around the cargo platform 8 can provide support and prevent tipping.

[0062] This application has the following advantages:

[0063] 1. This application has low energy consumption, uses an electric push rod to drive the control surface, and uses the air resistance of the control surface to change the attitude of the airdrop.

[0064] 2. The attitude adjustment rocker arm in this application can play a supporting role during the airdrop's ground contact process, effectively reducing the probability of the airdrop flipping.

[0065] 3. This application not only allows for attitude adjustment, but also increases air resistance and reduces landing speed when all four control surfaces are fully deployed, thereby reducing the probability of airdrop rollover.

[0066] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0067] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An air-drop attitude adjustment anti-inversion system, characterized in that, The first deployment device, the second deployment device, the first rudder surface (4), the second rudder surface (5), the third rudder surface (6), the fourth rudder surface (7) and the pallet (8) are included. The pallet (8) is used for mounting the first deployment device, the second deployment device and the goods (9). The first rudder surface (4), the second rudder surface (5), the third rudder surface (6) and the fourth rudder surface (7) are respectively arranged on the four outer sides of the goods (9) and are flexible and capable of being twisted. The first deployment device and the second deployment device are symmetrically mounted on the four edges of the pallet (8) and are used for driving the rudder surfaces to change the angles and shapes, so that the rudder surfaces can adjust the air flow resistance and the air drop posture. The first deployment device and the second deployment device each include a support (1), a rocker arm (2) and an electric push rod (3). The bottom end of the support (1) is fixed on the pallet (8), the upper end of the side arm of the support (1) is rotationally connected with the upper end of the electric push rod (3), the lower end of the side arm of the support (1) is rotationally connected with the lower end of the rocker arm (2), the lower end of the rocker arm (2) is also rotationally connected with the lower end of the electric push rod (3), and the side surface of the rocker arm (2) is fixedly connected with the corresponding short side of the rudder surface. The electric push rod (3) can be extended or retracted to drive the rocker arm (2) to swing upward or downward. The air drop posture adjusting process specifically includes: retracting the electric push rod (3) of the first deployment device to drive the rocker arm (2) to swing downward around the support (1); and extending the electric push rod (3) of the second deployment device to drive the rocker arm (2) to swing upward around the support (1), so that the rudder surface forms a twisted shape, a force parallel to the rudder surface is formed on the rudder surface by the action of the air flow, a rotational torque around the air drop center in the clockwise direction is formed, the other rudder surfaces work in the same way to form rotational torques around the air drop center in the clockwise direction, the four torques are superimposed to make the air drop rotate in the clockwise direction around the center until the length direction coincides with the speed direction; or, The electric push rod (3) of the first deployment device is extended to drive the rocker arm (2) to swing upward around the support (1); the electric push rod (3) of the second deployment device is retracted to drive the rocker arm (2) to swing downward around the support (1), so that the rudder surface forms a twisted shape, a force parallel to the rudder surface is formed on the rudder surface by the action of the air flow, a rotational torque around the air drop center in the counterclockwise direction is formed, the other rudder surfaces work in the same way to form rotational torques around the air drop center in the counterclockwise direction, the four torques are superimposed to make the air drop rotate in the counterclockwise direction around the center until the length direction coincides with the speed direction.

2. The parachute attitude adjustment anti-inversion system according to claim 1, wherein The first deployment device and the second deployment device have the same structure and configuration of components, and the difference lies in that they are symmetrically mounted.

3. A method of preventing a roll of the parachute attitude adjustment anti-roll system according to any one of claims 1 to 2, characterized in that, The deployment process of the deployment device and the air drop posture adjusting process are included. The unfolding device unfolding process includes: the first rudder surface (4), the second rudder surface (5), the third rudder surface (6) and the fourth rudder surface (7) are not unfolded at the beginning of the air drop, and are in the state of wrapping the goods (9); after being thrown away from the airplane, all the rudder surfaces are parallel to the pallet (8) under the action of the first and second unfolding devices, so as to increase the air drop windward area, increase the air resistance and reduce the air drop landing speed. The air drop posture adjusting process includes: the four rudder surfaces change the angles and shapes respectively through the first and second unfolding devices, a clockwise rotation torque around the air drop center of mass is formed, the four torques are superimposed, the air drop rotates clockwise around the center of mass until the length direction coincides with the speed direction; or a counterclockwise rotation torque around the air drop center of mass is formed, the four torques are superimposed, the air drop rotates counterclockwise around the center of mass until the length direction coincides with the speed direction; wherein the speed direction is the actual movement direction of the air drop, and the length direction is the direction parallel to the long side of the pallet.

4. The anti-roll method of claim 3, wherein The unfolding device unfolding process specifically includes: the first rudder surface (4), the second rudder surface (5), the third rudder surface (6) and the fourth rudder surface (7) are not unfolded at the beginning of the air drop, and are in the state of wrapping the goods (9); after being thrown away from the airplane, all the electric push rods (3) are retracted, the swing arms (2) are lowered around the supports (1), so that all the rudder surfaces are parallel to the pallet (8), thereby increasing the air drop windward area, increasing the air resistance and reducing the air drop landing speed.

5. The anti-roll method of claim 3, wherein The air drop posture adjusting process specifically includes: the electric push rod (3) of the first unfolding device is retracted, the swing arm (2) is lowered around the support (1); the electric push rod (3) of the second unfolding device is extended, the swing arm (2) is raised around the support (1), so that the rudder surface forms a twisted shape, and a force parallel to the rudder surface is formed on the rudder surface relative to the airflow, thereby forming a clockwise rotation torque around the air drop center of mass, and the remaining rudder surfaces work in the same way to form a clockwise rotation torque around the air drop center of mass, the four torques are superimposed, the air drop rotates clockwise around the center of mass until the length direction coincides with the speed direction; or, The air drop posture adjusting process specifically includes: the electric push rod (3) of the first unfolding device is retracted, the swing arm (2) is lowered around the support (1); the electric push rod (3) of the second unfolding device is extended, the swing arm (2) is raised around the support (1), so that the rudder surface forms a twisted shape, and a force parallel to the rudder surface is formed on the rudder surface relative to the airflow, thereby forming a clockwise rotation torque around the air drop center of mass, and the remaining rudder surfaces work in the same way to form a clockwise rotation torque around the air drop center of mass, the four torques are superimposed, the air drop rotates clockwise around the center of mass until the length direction coincides with the speed direction; or, 6. The anti-roll method of claim 3, wherein The air drop landing process, if the inclination occurs, the swing arms (2) around the pallet (8) can support and prevent the overturning.

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