Tail-finned projectile

Abstract

A tail-finned projectile for an electromagnetic launching device, the projectile being launchable by the electromagnetic launching device and comprising a projectile body (1) and a tail fin (2), wherein the projectile body (1) comprises a ferromagnetic material; and the tail fin (2) is connected to the projectile body (1), and the tail fin (2) comprises fin blades (21) and a fixing structure (22), the fixing structure (22) being located circumferentially outside the fin blades (21) and being connected to the fin blades (21), and the fixing structure (22) being engageable with the electromagnetic launching device before the projectile is launched by the electromagnetic launching device. The projectile allows the tail fin (2) to be held by a snap to prevent disengagement, such that the flight is more stable, and the projectile body (1) is less prone to rust, reducing energy consumption during firing.

Description

A projectile with tail fins Technical Field

[0001] The present application relates to finned projectiles for use with electromagnetic launchers. Background Art

[0002] The electromagnetic launcher works by generating a magnetic field through electric current. The interaction between this magnetic field and the ferromagnetic projectile generates the propulsion force. When current flows through the coil, it generates a magnetic field that interacts with the projectile, generating a propulsion force that propels the projectile along the guide rail. Because the magnetic field can be very strong, it can generate very high kinetic energy for the projectile, enabling it to achieve extremely high speeds and distances.

[0003] The advantages of electromagnetic launchers include their environmental friendliness, safety, controllability, and ease of maintenance. They produce no harmful gases or residue during use, making them more environmentally friendly. Furthermore, because the magnetic field is generated within the projectile, there is no excessive reaction force or noise, making them quieter and more stable during operation. Because they use electric current to control the magnetic field, control of the launch process is more precise and flexible. Electromagnetic launchers have broad application prospects in fields requiring projectile launches, such as entertainment and firefighting.

[0004] For example, patent CN204649069U discloses an electromagnetic device for launching magnetic projectiles. Specifically, it uses the mutual repulsion between magnetic fields as the projectile's propulsion force, which helps extend the projectile's acceleration distance and reduce circuit complexity. The key points of the technical solution adopted are: the projectile is made of permanent magnetic material and is magnetized; the direction of the projectile's magnetic field is opposite to the direction of the magnetic field generated by the straight solenoid after power is applied; the initial loading position of the projectile is located within the straight solenoid, close to the symmetrical point where the projectile is subjected to force within the straight solenoid's magnetic field, and biased toward the end of the straight solenoid that is in the same direction as the projectile's launch; during launch, a DC current is passed through the straight solenoid from the feed system, generating a magnetic field within the straight solenoid. This magnetic field and the projectile's magnetic field produce a mutually repulsive force, thereby pushing the projectile in the launch direction.

[0005] For example, patent CN112229266A discloses a device for increasing the kinetic energy of a reluctance electromagnetic projectile. The device comprises a cylindrical projectile, at least one primary transmitting coil, a capacitor and a discharge thyristor connected in series to the transmitting coil, and a freewheeling diode connected in parallel to the transmitting coil. The cylindrical projectile is divided into multiple layers of thin slices parallel to its axis, and the surface is coated with a thin layer of insulating varnish or insulating oxide. This patent improves the projectile's velocity by modifying the projectile's structure to reduce eddy currents caused by sudden electromagnetic field changes during launch.

[0006] However, conventional projectiles can suffer from poor flight stability during actual use with electromagnetic launchers, affecting their accuracy and speed. Furthermore, when the launcher's trajectory points downward or encounters bumps and vibrations, the projectile can escape from the electromagnetic launcher, causing it to drop or become stuck.

[0007] Summary of the Invention

[0008] The purpose of this application is to solve the above technical problems.

[0009] To achieve the above-mentioned purpose, the first aspect of the present application proposes a projectile with a tail fin, which is used for an electromagnetic launching device, and the projectile can be launched by the electromagnetic launching device. It is characterized in that the projectile includes a projectile body and a tail fin, the projectile body includes ferromagnetic material, the tail fin is connected to the projectile body, the tail fin includes a wing and a fixing structure, the fixing structure is located circumferentially outside the wing and is connected to the wing, and before the projectile is launched by the electromagnetic launching device, the fixing structure can be engaged with the electromagnetic launching device.

[0010] Furthermore, the fixing structure is an annular fixing ring, and the fixing ring surrounds the wing.

[0011] Furthermore, the maximum value of the outer diameter of the fixing ring is equal to or smaller than the maximum value of the outer diameter of the elastic body.

[0012] Furthermore, the maximum outer diameter of the fixing ring is d, and the maximum outer diameter of the elastic body is D max , 0.95D max ≤d≤D max .

[0013] Furthermore, the number of the fins is greater than or equal to 2.

[0014] Furthermore, the tail wing also includes a tail wing column and a connecting portion, the tail wing column is coaxially arranged with the projectile, the wing is connected to the outside of the tail wing column, the front end of the tail wing column is adjacent to the rear end of the projectile, the connecting portion is connected to the front end of the tail wing column and is located inside the projectile, and the tail wing is connected to the projectile through the connecting portion.

[0015] Furthermore, the outer diameter of the front end of the tail wing column is the same as the outer diameter of the rear end of the projectile.

[0016] Furthermore, the axial direction of the tail wing column includes two or more sections with different outer diameters, at least one of the sections is a transition section, and the outer diameter of the transition section tends to gradually decrease from the front end to the rear end.

[0017] Furthermore, the tail wing column also includes a rear section, and the outer diameter of the rear section is constant.

[0018] Furthermore, a front end surface of the fixing structure facing the front end is an at least partially continuous surface, and the front end surface of the fixing structure is not completely separated by the wing.

[0019] Furthermore, the wing does not contact the front end surface of the fixing structure.

[0020] Furthermore, the normal line of the front end surface of the fixing structure is set at an acute angle to the axial direction of the projectile, and the normal line of the front end surface of the fixing structure points to the front end and the outside of the projectile.

[0021] Furthermore, the connecting portion includes a joint structure, and the joint structure connects the projectile body and the tail wing together.

[0022] Furthermore, the maximum radial height of at least one position of the engagement structure close to the front end is greater than the maximum radial height of at least one position of the engagement structure close to the rear end.

[0023] Furthermore, the joint structure is an inverted trapezoid.

[0024] Furthermore, the length of the projectile is L1, the length of the tail wing located outside the projectile is L2, 5mm≤L1≤40mm, 0.5L1≤L2≤2L1.

[0025] Furthermore, 0.5L1≤L2≤L1.

[0026] Furthermore, the front end surface of the projectile facing the front end is a curved surface, and the radius of the curved surface is R, where R≥0.5L1.

[0027] Furthermore, the winglets are arranged radially outward and parallel to the axial direction of the projectile, and the material of the tail wing includes one or more of the following substances: polycarbonate, polystyrene, polyoxymethylene, nylon, polyetheretherketone, and a mixture of nylon and glass fiber.

[0028] Furthermore, the surface of the elastic body has a plating layer, the plating layer is a nickel plating layer or a chromium plating layer, and the surface finish Ra of the elastic body is less than 6.3.

[0029] Furthermore, the normal of the front end surface of the fixed structure is parallel to the axial direction of the projectile; or, the normal of the front end surface of the fixed structure is set at an acute angle to the axial direction of the projectile, and the normal of the front end surface of the fixed structure points to the front end and inner side of the projectile.

[0030] By applying the above technical solution of the present invention, at least the following technical effects are achieved:

[0031] 1. During the flight of a projectile with a tail fin, the airflow passes through the gaps between the fins, making its flight more stable.

[0032] 2. When a projectile with a tail fin is used in conjunction with an electromagnetic propulsion device with a buckle (especially a magazine with a buckle), the buckle will hold the tail fin so that it is not easy to fall out in the event of falling or bumping.

[0033] 3. When the projectile with tail fins is waiting to be launched in the electromagnetic propulsion device, due to the effect of the annular fixing ring, the tail fins will not be intertwined between the projectiles, making the launch smoother.

[0034] 4. The surface of the projectile is plated with chrome or nickel, making it less likely to rust.

[0035] 5. The maximum diameter of the tail fin is slightly smaller than or equal to the diameter of the projectile body, which effectively prevents the tail fins from interfering with each other between projectiles, and effectively prevents the tail fin diameter from being too small, causing the projectile below to rise prematurely when leaving the magazine and collide with the tail fin of the projectile, affecting the projectile above.

[0036] 6. In some embodiments, the lengths of the tail fin and the projectile body are limited to ensure that the tail fin can stabilize the projectile body.

[0037] 7. In some embodiments, the shape of the front end surface of the projectile is limited. This specially designed shape is more sensitive to electromagnetic attraction and saves energy when firing.

[0038] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0040] FIG1 shows a perspective view of a projectile with tail fins in one embodiment;

[0041] FIG2 shows a side view of a projectile with fins according to one embodiment;

[0042] FIG3 shows a structural diagram of a projectile with tail fins in one embodiment, viewed from the rear end to the front end;

[0043] FIG4 shows an enlarged view of the rear end of a projectile with fins according to one embodiment;

[0044] FIG5 shows a cross-sectional view of a projectile with tail fins according to an embodiment;

[0045] FIG6 shows another perspective view of a projectile with fins according to one embodiment;

[0046] FIG7 shows a side view of a projectile with tail fins mated with a buckle in an electromagnetic launch device in one embodiment;

[0047] FIG8 shows a perspective view of a projectile with tail fins mating with a buckle in an electromagnetic launch device in one embodiment;

[0048] FIG9 shows a side view of a projectile with tail fins disengaged from a snap-fit ​​in an electromagnetic launch device according to an embodiment;

[0049] FIG10 shows a perspective view of a projectile with a tail fin disengaged from a buckle in an electromagnetic launch device in one embodiment.

[0050] Figure numerals: 1. projectile body, 11. front end surface of projectile body, 2. tail wing, 21. wing, 22. fixed structure, 221. front end surface of fixed structure, 23. tail wing column, 231. transition section, 232. rear section, 24. connecting part, 3. buckle. DETAILED DESCRIPTION

[0051] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] The present invention is further described in detail below with reference to specific examples. These examples should not be construed as limiting the scope of protection claimed in the present invention.

[0053] As shown in Figures 1-3, according to one aspect of the present invention, a projectile with tail fins is provided for use with an electromagnetic launch device. The projectile can be launched by the electromagnetic launch device. The projectile includes a projectile body 1 and tail fins 2. The projectile body 1 includes a ferromagnetic material that can interact with the magnetic field of the electromagnetic launch device, thereby accelerating the projectile for launch from the electromagnetic launch device. Specifically, the material of the projectile body 1 can be iron, with an iron content of at least 99% by mass.

[0054] The tail 2 is connected to the projectile body 1. The tail 2 includes a wing 21 and a fixed structure 22. The fixed structure 22 is located outside the circumference of the wing 21 and is connected to the wing 21. Before the projectile is launched by the electromagnetic launch device, the fixed structure 22 can be engaged with the electromagnetic launch device. After the projectile is subjected to the launch force of the electromagnetic launch device, the projectile can be disengaged under the effect of the launch force and launched by the electromagnetic launch device. During the flight of the above-mentioned projectile with tail, airflow passes through the gap between the wing, making its flight more stable. On the other hand, when the projectile with tail is used in conjunction with the electromagnetic propulsion device with buckle 3 (especially the magazine with buckle), it encounters situations such as falling and bumping, and the buckle holds the tail so that it is not easy to come out.

[0055] The preferred materials for the tail wing are polycarbonate (PC), polystyrene (PS), polyoxymethylene (POM), nylon (PA), polyetheretherketone (PEEK), nylon + glass fiber, etc.

[0056] Furthermore, the fixing structure 22 is an annular fixing ring that surrounds the wing 21. When the projectile with tail fins is to be launched in the electromagnetic propulsion device, due to the effect of the annular fixing ring, the tail fins will not be intertwined between the projectiles, making the launch smoother.

[0057] In other embodiments, the fixing structure 22 may not be in the form of a fixing ring. For example, a fixing arc may be provided on the tail wing, and a plurality of fixing arcs may be formed to surround the tail wing in the circumferential direction.

[0058] Furthermore, the maximum outer diameter of the retaining ring is equal to or less than the maximum outer diameter of the projectile 1. In some embodiments, as shown in Figures 1-3, the side surface of the projectile 1 is a cylindrical surface with a constant outer diameter. Therefore, the maximum outer diameter of the projectile 1 is the outer diameter of the cylindrical surface of the projectile 1. At the same time, the maximum outer diameter of the side surface of the retaining ring is also a cylindrical surface. Therefore, the maximum outer diameter of the retaining ring is also the outer diameter of the cylindrical surface on the retaining ring.

[0059] Furthermore, the maximum outer diameter of the fixing ring is d, and the maximum outer diameter of the projectile 1 is D max , 0.95D max ≤d≤D max .

[0060] Since multiple projectiles are installed side by side in the magazine, the maximum diameter of the tail fin is slightly smaller than or equal to the diameter of the projectile body, which effectively prevents the tail fins of the projectiles from interfering with each other, and effectively prevents the tail fin diameter from being too small. When the projectile leaves the magazine, the projectile below it rises too early and collides with the tail fin of the projectile, affecting the projectile above.

[0061] Furthermore, the number of the fins 21 is greater than or equal to 2. In Figures 1-3, the number of the fins is 3. In other embodiments, the number of the fins can be 2, 4, 5, 6, or other numbers.

[0062] Referring to Figures 1-5 at the same time, further, the tail wing 2 also includes a tail wing column 23 and a connecting portion 24. The tail wing column 23 is coaxially arranged with the projectile 1. The wing 21 is connected to the outside of the tail wing column 23. The front end of the tail wing column 23 is adjacent to the rear end of the projectile 1. The connecting portion 24 is connected to the front end of the tail wing column 23 and is located inside the projectile 1. The tail wing 2 is connected to the projectile 1 through the connecting portion 24.

[0063] In the present invention, the "front end" refers to the end along the projectile flight direction, and the "rear end" refers to the end opposite to the projectile flight direction.

[0064] Furthermore, the outer diameter of the front end of the tail wing column 23 is the same as the outer diameter of the rear end of the projectile 1 .

[0065] Referring to Figures 1-6 , the fin column 23 further comprises two or more sections 231, 232 with different outer diameters along its axial direction. At least one section is a transition section 231, the outer diameter of which gradually decreases from the front end to the rear end. The provision of the transition section ensures a smoother transition between the fin and the missile body, guiding airflow and enhancing the stability of the fin.

[0066] Furthermore, the tail wing column 23 also includes a rear section 232, and the outer diameter of the rear section 232 is constant.

[0067] Furthermore, the front end face 221 of the fixed structure 22, which faces the front end, is at least partially continuous, and is not completely separated by the fins 21. The fact that the front end face 221 is at least partially continuous leaves a snap-fit ​​position for the latch 3 on the electromagnetic launch device (particularly the magazine), allowing the latch 3 of the electromagnetic launch device to engage with the front end face 221 before the projectile is launched by the electromagnetic launch device. The latch 3 of the electromagnetic launch device applies a certain force to the front end face 221, securing the projectile in the electromagnetic launch device with a certain degree of firmness. The fact that the front end face 221 is not completely separated by the fins 21 ensures that space exists at all axial positions on the front end face 221 for engagement with the latch 3 of the electromagnetic launch device.

[0068] Furthermore, the wing does not contact the front end face of the fixed structure, further ensuring the space for the electromagnetic launch device's buckle 3 to cooperate with the tail wing, improving the consistency of the engagement between the tail wing and the buckle 3, and at all axial positions of the fixed structure 22, the buckle 3 of the electromagnetic launch device can be fully engaged with the front end face 221 of the fixed structure.

[0069] Furthermore, the normal line of the front end surface 221 of the fixed structure is set at an acute angle to the axial direction of the projectile, and the normal line of the front end surface 221 of the fixed structure points to the front end and the outside of the projectile.

[0070] The normal to the front end face 221 of the fixed structure is the direction indicated by the dotted arrow in FIG4 (the normal pointing to the outside of the fixed structure, rather than the opposite normal pointing to the inside of the fixed structure), which is at an acute angle to the axial direction of the projectile, and is directed toward the front end of the projectile and toward the radially outer side of the projectile.

[0071] This causes the front end surface 221 of the fixed structure to be inclined outward and backward as shown in Figure 4. This inclined surface arrangement makes it easier for the projectile to disengage from the buckle during launch. When combined with the buckle that utilizes the elasticity of the material itself to complete the buckle release process, the advantages are outstanding. It is worth noting that the front end surface 221 of the fixed structure does not necessarily have to be an inclined surface as shown in Figure 4, but can also be a curved surface, which can be slightly convex. As long as the normal line of the front end surface 221 of the fixed structure is set at an acute angle to the axial direction of the projectile, and the normal line of the front end surface 221 of the fixed structure points to the front end and outside of the projectile, a similar effect can be achieved.

[0072] In other embodiments, the front end face 221 of the fixed structure may also be oriented in other directions, such as with the normal of the front end face 221 parallel to the axial direction, or with the normal oriented toward the front and inner side of the projectile relative to the axial direction. If this arrangement is adopted, the projectile and the electromagnetic launch device are more securely engaged and will not disengage even under severe shock. During launch, a greater electromagnetic force is required to disengage the buckle; however, the buckle can also be controlled by a control mechanism to release the tail fin, allowing for smooth launch. This advantage is particularly evident when used in conjunction with a buckle equipped with a control mechanism.

[0073] Furthermore, the connecting portion 24 includes a coupling structure that joins the projectile body 1 and the tail fins 2 together. Furthermore, the maximum radial height of the coupling structure at at least one location near the front end is greater than the maximum radial height at at least one location near the rear end. Furthermore, the coupling structure can be an inverted trapezoidal snap-in structure. Referring to Figure 5 , the portion of the connecting portion 24 framed by the dotted box (the dotted box itself is not a structure on the projectile body) is an inverted trapezoidal snap-in structure. The radial height of the inverted trapezoid gradually decreases from the front end to the rear end, so the maximum radial height of the snap-in structure gradually decreases from the front end to the rear end. Using this snap-in structure facilitates projectile assembly. The projectile body 1 and tail fins 2 of the projectile can be separately formed and then axially engaged to form the projectile. Alternatively, after the projectile body 1 is formed, the tail fins 2 can be directly cast onto the projectile body 1, thereby achieving a secure connection between the projectile body 1 and the tail fins 2.

[0074] In other embodiments, the locking structure may also be a block with a connecting column block, a sawtooth, a spiral, or other structures that can fix the tail fin and the projectile together.

[0075] In some other embodiments, the snap-fit ​​structure may not be used. For example, the connection between the tail wing 2 and the projectile body 1 may be achieved by designing the connecting portion 24 to be in interference fit with the internal space of the projectile body 1 .

[0076] Furthermore, the length of the projectile body is L1, and the length of the tail fin located outside the projectile body is L2. 5mm≤L1≤40mm, 0.5L1≤L2≤2L1. Furthermore, 0.5L1≤L2≤L1. This limitation on the length of the tail fin and the projectile body ensures that the tail fin stabilizes the projectile body.

[0077] Furthermore, the front end surface of the projectile facing the front end is an arc surface, and the radius of the arc surface is R, R≥0.5L1. The shape of the front end surface of the projectile is limited. This specially designed shape is more sensitive to electromagnetic attraction and saves energy when firing.

[0078] Furthermore, the fins are arranged radially outwards and parallel to the axial direction of the projectile. In other words, the fins are straight fins that radiate radially outwards. In certain embodiments, fins with a twist angle can also be used.

[0079] Furthermore, the projectile has a surface coating, either nickel or chromium, with a surface finish of Ra less than 6.3. The chromium or nickel plating prevents rusting. This surface finish ensures that the projectile is not excessively affected by friction during launch from the electromagnetic launcher.

[0080] Figures 7-10 illustrate the process of engaging and disengaging the projectile with the electromagnetic propulsion device of the present invention. In Figures 7 and 8, the projectile's fixed structure 22 cooperates with the snap 3 in the electromagnetic propulsion device (especially the magazine). Specifically, the fixed structure front end face 221 of the fixed structure 22 cooperates with the snap 3, so that the projectile is retained in the electromagnetic propulsion device. In the event of a fall or bump, the snap holds the tail fin, preventing it from dislodging. In Figures 8 and 9, when the projectile is subjected to the launch force of the electromagnetic propulsion device, the projectile moves forward, the fixed structure 22 disengages from the snap 3, and the projectile is launched by the electromagnetic launch device.

[0081] In summary, the application of the above technical solution of the present invention achieves at least the following technical effects:

[0082] 1. During the flight of a projectile with a tail fin, the airflow passes through the gaps between the fins, making its flight more stable.

[0083] 2. When a projectile with a tail fin is used in conjunction with an electromagnetic propulsion device with a buckle (especially a magazine with a buckle), the buckle will hold the tail fin so that it is not easy to fall out in the event of falling or bumping.

[0084] 3. When the projectile with tail fins is waiting to be launched in the electromagnetic propulsion device, due to the effect of the annular fixing ring, the tail fins will not be intertwined between the projectiles, making the launch smoother.

[0085] 4. The surface of the projectile is plated with chrome or nickel, making it less likely to rust.

[0086] 5. The maximum diameter of the tail fin is slightly smaller than or equal to the diameter of the projectile body, which effectively prevents the tail fins from interfering with each other between projectiles, and effectively prevents the tail fin diameter from being too small, causing the projectile below to rise prematurely when leaving the magazine and collide with the tail fin of the projectile, affecting the projectile above.

[0087] 6. In some embodiments, the lengths of the tail fin and the projectile body are limited to ensure that the tail fin can stabilize the projectile body.

[0088] 7. In some embodiments, the shape of the front end surface of the projectile is limited. This specially designed shape is more sensitive to electromagnetic attraction and saves energy when firing.

[0089] The above are only a number of specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

[0090] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0091] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

Claims

1. A projectile with tail fins, used for an electromagnetic launch device, wherein the projectile can be launched by the electromagnetic launch device, characterized in that: The projectile comprises a body (1) and a tail wing (2), wherein the body (1) comprises a ferromagnetic material, the tail wing (2) is connected to the body (1), the tail wing (2) comprises a wing (21) and a fixing structure (22), the fixing structure (22) is located outside the circumference of the wing (21) and is connected to the wing (21), and before the projectile is launched by the electromagnetic launch device, the fixing structure (22) can be engaged with the electromagnetic launch device.

2. The projectile according to claim 1, characterized in that The fixing structure (22) is an annular fixing ring, which surrounds the wing (21), and the number of the wing (21) is greater than or equal to 2.

3. The projectile according to claim 2, characterized in that The maximum value of the outer diameter of the fixing ring is equal to or smaller than the maximum value of the outer diameter of the elastic body (1).

4. The projectile according to claim 2 or 3, characterized in that The maximum value of the outer diameter of the fixing ring is d, and the maximum value of the outer diameter of the elastic body (1) is D max , 0.95D max ≤d≤D max .

5. The projectile according to any one of claims 1 to 4, characterized in that The tail wing (2) further comprises a tail wing column (23) and a connecting portion (24), wherein the tail wing column (23) is coaxially arranged with the projectile (1), the wing (21) is connected to the outside of the tail wing column (23), the front end of the tail wing column (23) is adjacent to the rear end of the projectile (1), the connecting portion (24) is connected to the front end of the tail wing column (23) and is located inside the projectile (1), and the tail wing (2) is connected to the projectile (1) via the connecting portion (24).

6. The projectile according to claim 5, characterized in that The outer diameter of the front end of the tail wing column (23) is the same as the outer diameter of the rear end of the projectile (1); the tail wing column (23) includes two or more sections (231, 232) with different outer diameters in the axial direction; at least one of the sections is a transition section (231); the outer diameter of the transition section (231) tends to gradually decrease from the front end to the rear end; the tail wing column (23) also includes a rear section (232); the outer diameter of the rear section (232) is constant.

7. The projectile according to any one of claims 1 to 6, characterized in that The front end surface (221) of the fixed structure (22) facing the front end is at least a partially continuous surface, and the front end surface (221) of the fixed structure is not completely separated by the wing (21).

8. The projectile according to claim 7, characterized in that The wing (21) does not contact the front end surface (221) of the fixed structure.

9. The projectile according to claim 7 or 8, characterized in that The normal line of the front end surface (221) of the fixed structure is arranged at an acute angle to the axial direction of the projectile, and the normal line of the front end surface (221) of the fixed structure points to the front end and the outside of the projectile.

10. The projectile according to claim 5 or 6, characterized in that The connecting portion (24) includes a joint structure, and the joint structure connects the missile body (1) and the tail wing (2) together.

11. The projectile according to claim 10, characterized in that The maximum radial height of the engagement structure at at least one position close to the front end is greater than the maximum radial height of the engagement structure at at least one position close to the rear end.

12. The projectile according to claim 10 or 11, characterized in that The joint structure is in an inverted trapezoidal shape.

13. The projectile according to any one of claims 1 to 12, characterized in that The length of the projectile (1) is L1, the length of the tail wing (2) located outside the projectile (1) is L2, 5mm≤L1≤40mm, 0.5L1≤L2≤2L1.

14. The projectile according to claim 13, characterized in that 0.5L1≤L2≤L1.

15. The projectile according to claim 13 or 14, characterized in that The front end surface (11) of the projectile (1) facing the front end is a curved surface, and the radius of the curved surface is R, where R≥0.5L1.

16. The projectile according to any one of claims 1 to 15, characterized in that The wing (21) is arranged radially outward and parallel to the axial direction of the projectile, and the material of the tail wing (2) includes one or more of the following substances: polycarbonate, polystyrene, polyoxymethylene, nylon, polyetheretherketone, and a mixture of nylon and glass fiber; the surface of the projectile (1) has a coating, and the coating is a nickel coating or a chromium coating, and the surface finish Ra of the projectile (1) is less than 6.

3.

17. The projectile according to claim 7 or 8, characterized in that The normal line of the front end surface (221) of the fixed structure is parallel to the axial direction of the projectile; or, the normal line of the front end surface (221) of the fixed structure is set at an acute angle to the axial direction of the projectile, and the normal line of the front end surface (221) of the fixed structure points to the front end and the inner side of the projectile.

Images