Buoy-vertical fin integrated structure of tandem type overwater tilting wing unmanned aerial vehicle

Abstract

The invention discloses a buoy-vertical fin integrated structure of a tandem water tilting wing unmanned aerial vehicle. The buoy-vertical fin integrated structure is vertically connected to the rear part of a wing tip. According to the invention, the stability requirements of water surface take-off and landing and air flight of the water tilting wing unmanned aerial vehicle can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft design, and in particular relates to a tandem water tilt-wing UAV float-vertical tail integrated structure. Background Art

[0002] For tilt-wing UAVs that take off and land vertically on the water, it is necessary to design a float structure to ensure lateral stability on the water surface, and a vertical tail structure to ensure heading stability in the air. Therefore, for conventional seaplanes, the float and vertical tail structures are two completely separate parts, which increases the overall weight and complexity.

[0003] Existing multi-rotor / tilt-rotor drones for vertical take-off and landing on water do not have the function of tilting wings, so it is impossible to use a structure similar to a vertical tail as a buoy by tilting. Existing tilt-wing drones lack a configuration for vertical take-off and landing on water.

[0004] Chinese patent CN115924148A is a tilt-rotor water drone. In order to ensure lateral stability on the water surface, it adopts the double buoy design of conventional seaplanes and a V-shaped vertical tail structure.

[0005] Chinese patent CN112357075A is a tilt-rotor water drone, but it is designed as a tilt-rotor rather than a tilt-wing. In order to ensure lateral stability on the water surface, a larger double buoy structure is designed. At the same time, the configuration does not have a corresponding structure to ensure the heading stability of the flight in the air.

[0006] There are no published precedents for the use of this type of integrated float / vertical tail structure design. Summary of the invention

[0007] Purpose of the Invention

[0008] In view of the problem that existing multi-rotor / tilt-rotor UAVs for vertical take-off and landing on water do not have the function of tilting wings, the present invention provides a tandem water tilt-wing UAV buoy-vertical tail integrated structure, which simultaneously realizes the functions of the buoy and the vertical tail, reducing the overall weight and structural complexity of the UAV.

[0009] Inventing technical solutions

[0010] A tandem water tilt-wing UAV float-vertical tail integrated structure, the structure is vertically connected to the rear part of the wing tip.

[0011] Preferably, the wings to which the structure is connected are capable of tilting.

[0012] Preferably, the structure is formed by connecting two trapezoidal wings, an upper one and a lower one.

[0013] Preferably, the chord length of the root portion of the two trapezoidal wings is greater than the chord length of the tip portion.

[0014] Preferably, the cross-section of the structure is streamlined.

[0015] Preferably, the structure is connected to the rear wing tip.

[0016] Preferably, the height of the lower trapezoidal wing is less than the height of the upper trapezoidal wing.

[0017] Preferably, when the UAV performs vertical takeoff and landing on the water surface, the wings are tilted 90 degrees, and the structure is partially immersed in the water, acting as a buoy.

[0018] Advantages of the present invention:

[0019] (1) Reduced overall weight, with an overall weight reduction of 3%-4%.

[0020] (2) Reduced forward flight resistance, with a maximum drag reduction of 5%.

[0021] (3) The UAV based on this design has a simple structure and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a configuration diagram of the tandem water tilt-wing unmanned aircraft of the present invention.

[0023] Figure 2 It is a three-dimensional diagram of the appearance and installation position of the buoy-vertical tail integrated structure of the present invention.

[0024] Figure 3 It is a side view of the buoy-vertical tail integrated structure (with wings) of the present invention.

[0025] Figure 4 It is a top view of the buoy-vertical tail integrated structure (with wings) of the present invention.

[0026] Figure 5 It is a front view of the buoy-vertical tail integrated structure (with wings) of the present invention.

[0027] In the figure: 1. pontoon-vertical tail integrated structure; 2. front wing; 3. front aileron; 4. main fuselage; 5. rear wing; 6. rear aileron; 7. upper part of pontoon-vertical tail integrated structure; 8. lower part of pontoon-vertical tail integrated structure; 9. pontoon-vertical tail integrated structure connected to wing; 10. wing; 11. aileron. DETAILED DESCRIPTION

[0028] The present invention is achieved through the following technical solutions.

[0029] The invention discloses a tandem type floating buoy-vertical tail integrated structure of a water-based tilt-wing UAV, which is used for a UAV with a tandem wing layout, a tilt-wing and the ability to take off and land on the water surface.

[0030] like Figure 1 The tandem wing layout includes a front wing 2, a front aileron 3, a main body 4, a rear wing 5, and a rear aileron 6. The integrated structure is connected to the rear wing 5.

[0031] The installation position of the float-vertical tail integrated structure is different from that of the general wingtip winglet. It is located at the rear of the wingtip airfoil. This is to increase the submerged volume of the structure to increase buoyancy when the UAV takes off and lands vertically on the water.

[0032] from Figure 3 It can be seen that the cross-section of the pontoon-vertical tail integrated structure is streamlined. The structure is divided into two parts, both of which are trapezoidal wings, and the lower part is shorter than the upper part. In the specific design, based on the requirements of the vertical tail, the cross-section adopts a streamlined design. However, the streamlined design will result in a smaller displacement volume when functioning as a pontoon, so there are requirements for the installation position. The structure is installed at the rear of the wingtip airfoil. When the wing tilts downward, sufficient submerged volume is guaranteed to meet the restoring moment requirement for lateral stability.

[0033] In view of the characteristics of the tandem layout, the present invention eliminates the conventional vertical tail at the rear of the fuselage and installs a structure similar to a winglet at the wing tip of the rear wing to realize the function of the vertical tail. In view of the characteristic that the wings of the UAV can be tilted, the conventional buoy design is eliminated and the structure is installed at the rear of the wing tip airfoil, which is placed under the fuselage through tilting to realize the function of the buoy on the water surface.

[0034] The buoy-vertical tail integrated structure has two main usage modes:

[0035] When the UAV performs vertical takeoff and landing on the water, the wings tilt 90 degrees and the float-vertical tail integrated structure is partially immersed in the water, acting as a float and enhancing the lateral stability of the UAV.

[0036] When the UAV is flying in the air, because the float-vertical tail integrated structure is located at the rear wing, far away from the center of gravity, the UAV's heading stability is enhanced. At the same time, it has some functions of winglets, which improves the aerodynamic characteristics of the wing.

[0037] The protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these changes and modifications.

Claims

1. A tandem floating tilt-wing UAV buoy-vertical tail integrated structure, characterized in that: The structure is attached vertically to the rear of the wing tip.

2. A tandem water tilt-wing UAV buoy-vertical tail integrated structure as claimed in claim 1, characterized in that: The wings connected to this structure can tilt.

3. The tandem water tilt-wing UAV buoy-vertical tail integrated structure as claimed in claim 1, characterized in that: The structure is composed of upper and lower trapezoidal wings connected.

4. The tandem water tilt-wing UAV buoy-vertical tail integrated structure as claimed in claim 3, characterized in that: The root chord length of the two trapezoidal wings is greater than the chord length of the tip.

5. The tandem water tilt-wing UAV buoy-vertical tail integrated structure as claimed in claim 1, characterized in that: The cross section of the structure is streamlined.

6. The tandem water tilt-wing UAV buoy-vertical tail integrated structure as claimed in claim 1, characterized in that: The structure is connected to the wingtips of the two rear wings.

7. The tandem water tilt-wing UAV buoy-vertical tail integrated structure as claimed in claim 3, characterized in that: The height of the lower trapezoidal wing is smaller than the height of the upper trapezoidal wing.

8. The tandem water tilt-wing UAV buoy-vertical tail integrated structure as claimed in claim 1, characterized in that: When the drone performs vertical takeoff and landing on the water, the wings tilt 90 degrees and the structure is partially submerged in the water, acting as a buoy.

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