Electric ducted fan type fixed wing short-distance take-off and landing aircraft

Abstract

The invention relates to the technical field of aircrafts, in particular to an electric ducted fan type fixed wing short-distance take-off and landing aircraft which comprises an aircraft body (1), a flight control system (2), electric ducted fans (3), jet engine tail nozzles (4), front wings (5), power batteries (6) and rear wings (7). The electric ducted fan type fixed wing short-distance take-off and landing aircraft is high in flight speed and can also fly at an extremely low speed; special airports and runways are not needed, so that the use cost is reduced; through electric driving, the carbon emission is obviously reduced; and the fan is mounted in the duct, so that the danger to the surrounding environment can be reduced, and the safety is high.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft, and in particular to an electric ducted fan type fixed-wing short take-off and landing aircraft. Background Art

[0002] The aviation industry needs to curb the rapid growth of carbon emissions and reduce them, especially to significantly reduce the amount of carbon dioxide emitted by aviation engines burning fuel. This requires seeking fundamental answers from the design and manufacture of aircraft.

[0003] By 2027, my country's general aviation equipment supply capacity and industrial innovation capacity will be significantly improved, a modern general aviation basic support system will be basically established, an efficient and integrated industrial ecosystem will be initially formed, and a general aviation public service equipment system will be basically improved. New general aviation equipment with unmanned, electrified, and intelligent technical features will be commercially applied in urban air transport, logistics distribution, emergency rescue and other fields. By 2030, a new model for the development of the general aviation industry characterized by high-end, intelligent, and green development will be basically established, supporting and ensuring the safe and efficient operation of the "short-distance transport + electric vertical take-off and landing" passenger network, the "trunk-branch-end" drone delivery network, and the low-altitude production operation network that meets the needs of industrial and agricultural operations. General aviation equipment will be fully integrated into all areas of people's production and life, becoming a powerful driving force for the growth of the low-altitude economy and forming a trillion-level market scale.

[0004] Intelligence, automation, electrification, and short takeoff and landing are the current trends, requiring aircraft to undergo changes;

[0005] The electric ducted fan fixed-wing short take-off and landing aircraft involved in the present application has at least the following beneficial technical effects: the electric ducted fan fixed-wing short take-off and landing aircraft can take off and land in a short distance without the need for a dedicated airport and runway, thus saving expensive airport construction costs and reducing operating costs; the electric ducted fan fixed-wing short take-off and landing aircraft can significantly reduce carbon emissions. Summary of the invention

[0006] The purpose of the present application is to provide an electric ducted fan fixed-wing short take-off and landing aircraft, which has a high flight speed and can also fly at an extremely slow speed; it can take off and land in a short distance, does not require a dedicated airport and runway, and reduces the cost of use; it is electrically driven and significantly reduces carbon emissions; the fan is installed in the duct to reduce the risk to the surrounding environment and has high safety.

[0007] The technical solution of the present application is: an electric ducted fan fixed-wing short take-off and landing aircraft, characterized in that the electric ducted fan fixed-wing short take-off and landing aircraft comprises a fuselage (1), a flight control system (2), an electric ducted fan (3), a jet engine tail nozzle (4), a front wing (5), a power battery (6), and a rear wing (7);

[0008] The main function of the fuselage (1) is to carry equipment, passengers, cargo, etc., and to connect components such as a flight control system (2), an electric ducted fan (3), a jet engine tail nozzle (4), a front wing (5), a power battery (6), and a rear wing (7) into a whole; the flight control system (2) is used to operate and control the aircraft;

[0009] The electric ducted fan (3) is an electrically driven ducted fan structure. After the driving motor receives the input voltage and electric power, it drives the fan to rotate at a high speed, accelerates the ejection of air to obtain thrust, and overcomes the resistance encountered by the aircraft during flight. The air inlet of the electric ducted fan (3) is directly facing the front airflow in the level flight state (i.e., facing forward in the direction of level flight, or similar to facing forward in the direction of level flight). Since the electric ducted fan (3) does not require air to participate in combustion, the rear electric ducted fan (3) will not be greatly affected if it inhales the air discharged by the front electric ducted fan (3).

[0010] The jet engine tail nozzle (4) can be deflected downward by 90 degrees (or approximately 90 degrees, or similar to 90 degrees) or more. When the electric ducted fan type fixed-wing short take-off and landing aircraft is to take off and land short distances, the jet engine tail nozzle (4) is deflected downward by 90 degrees (or approximately 90 degrees, or similar to 90 degrees). The relatively high-speed airflow ejected from the electric ducted fan (3) passes through the jet engine tail nozzle (4) deflected downward by 90 degrees (or approximately 90 degrees, or similar to 90 degrees), generating a downward thrust, thereby generating an upward reaction force, thereby providing lift to the electric ducted fan type fixed-wing short take-off and landing aircraft;

[0011] The front wing (5) is located at the front part (or close to the front part) of the fuselage (1), and the rear wing (7) is located at the rear part (or close to the rear part) of the fuselage (1). When the electric ducted fan fixed-wing short take-off and landing aircraft is in level flight, the front wing (5) and the rear wing (7) are the main components for generating lift. Since both the front and rear wings provide lift, the wingspan can be made shorter compared to a traditional aircraft with only one set of wings.

[0012] The left front wing (5), the right front wing (5), the left rear wing (7) and the right rear wing (7) are each equipped with one (or several) (or a group) of the electric ducted fans (3) and the jet engine tail nozzle (4);

[0013] When the electric ducted fan type fixed-wing short take-off and landing aircraft is to perform a short take-off and landing, the jet engine tail nozzles (4) of the left front wing (5), the right front wing (5), the left rear wing (7) and the right rear wing (7) are all deflected downward by 90 degrees (or approximately 90 degrees, or similar to 90 degrees), and the take-off and landing, pitching, left-right rolling, etc. of the electric ducted fan type fixed-wing short take-off and landing aircraft are controlled by controlling the thrust of the electric ducted fan (3) at the four locations;

[0014] When the electric ducted fan fixed-wing short take-off and landing aircraft is about to take off and land, the jet engine tail nozzles (4) of the left front wing (5), the right front wing (5), the left rear wing (7) and the right rear wing (7) are all deflected downward by 90 degrees (or approximately 90 degrees, or similar to 90 degrees), and the relatively high-speed airflow ejected from the electric ducted fans (3) at the four locations passes through the jet engine tail nozzles (4) at the four locations deflected downward by 90 degrees (or approximately 90 degrees, or similar to 90 degrees), thereby generating a high-speed airflow. A downward thrust is generated, thereby generating an upward reaction force, providing lift to the electric ducted fan type fixed-wing short take-off and landing aircraft; at the same time, when the electric ducted fan (3) accelerates the air, it is subjected to a forward reaction force, pushing the electric ducted fan type fixed-wing short take-off and landing aircraft forward. When the force exceeds the forward resistance of the electric ducted fan type fixed-wing short take-off and landing aircraft, the electric ducted fan type fixed-wing short take-off and landing aircraft moves forward and has a forward speed, and the front wing (5) and the rear wing (7) generate lift;

[0015] Since the electric ducted fan fixed-wing short take-off and landing aircraft has a relatively low forward speed during short take-off and landing, the lift generated by the front wing (5) and the rear wing (7) is small, and the lift generated by the front wing (5) and the rear wing (7) is not considered when explaining the relevant control;

[0016] When the electric ducted fan fixed-wing short take-off and landing aircraft is to ascend or accelerate in the short take-off and landing stage, the electric ducted fans (3) at the four locations are controlled so that the sum of the lifts generated for the electric ducted fan fixed-wing short take-off and landing aircraft is greater than the weight of the electric ducted fan fixed-wing short take-off and landing aircraft; when the electric ducted fan fixed-wing short take-off and landing aircraft is to accelerate in descent, the electric ducted fans (3) at the four locations are controlled so that the sum of the lifts generated for the electric vertical take-off and landing aircraft is less than the weight of the electric ducted fan fixed-wing short take-off and landing aircraft;

[0017] When the electric ducted fan type fixed-wing short take-off and landing aircraft needs to maintain the original lifting state during the short take-off and landing phase, the electric ducted fans (3) at the four locations are controlled so that the sum of the lifts generated for the electric ducted fan type fixed-wing short take-off and landing aircraft is equal to the weight of the electric ducted fan type fixed-wing short take-off and landing aircraft;

[0018] When the electric ducted fan fixed-wing short take-off and landing aircraft is to roll to the left during the short take-off and landing phase, the thrust of the electric ducted fan (3) of the left front wing (5) and the left rear wing (7) is reduced, or the thrust of the electric ducted fan (3) of the right front wing (5) and the right rear wing (7) is increased;

[0019] When the electric ducted fan fixed-wing short take-off and landing aircraft is to roll to the right during the short take-off and landing phase, the thrust of the electric ducted fan (3) of the left front wing (5) and the left rear wing (7) is increased or the thrust of the electric ducted fan (3) of the right front wing (5) and the right rear wing (7) is reduced;

[0020] When the electric ducted fan fixed-wing short take-off and landing aircraft needs to pitch up (raise its head) during the short take-off and landing phase, the thrust of the electric ducted fan (3) of the left front wing (5) and the right front wing (5) is increased, or the thrust of the electric ducted fan (3) of the left rear wing (7) and the right rear wing (7) is reduced;

[0021] When the electric ducted fan fixed-wing short take-off and landing aircraft needs to pitch down (lower its head) during the short take-off and landing phase, the thrust of the electric ducted fan (3) of the left front wing (5) and the right front wing (5) is reduced, or the thrust of the electric ducted fan (3) of the left rear wing (7) and the right rear wing (7) is increased;

[0022] When the electric ducted fan fixed-wing short take-off and landing aircraft is taking off or landing, the jet engine tail nozzle (4) is deflected downward by more than 90 degrees (generally not more than 120 degrees), and the high-speed airflow ejected from the electric ducted fan (3) passes through the jet engine tail nozzle (4) that is deflected downward by more than 90 degrees (generally not more than 120 degrees), thereby generating a downward thrust component, thereby generating an upward reaction force to provide lift for the electric ducted fan fixed-wing short take-off and landing aircraft; and generating a forward thrust component, thereby generating a backward reaction force, and controlling the magnitude of the forward thrust component to be equal to the magnitude of the forward reaction force received by the electric ducted fan (3) when accelerating the air. The fan-type fixed-wing short take-off and landing aircraft offsets the influence of the forward reaction force when the electric ducted fan (3) accelerates the air, and the electric ducted fan fixed-wing short take-off and landing aircraft can achieve vertical take-off and landing without short take-off and landing; if the sum of the lifts generated by the electric ducted fans (3) at the four parts of the left front wing (5), the right front wing (5), the left rear wing (7) and the right rear wing (7) respectively to the electric ducted fan fixed-wing short take-off and landing aircraft is equal to the gravity of the electric ducted fan fixed-wing short take-off and landing aircraft, and the sum of the moments of the thrusts of the electric ducted fans (3) at the four parts to the center of gravity is 0, hovering in the air can be achieved;

[0023] When the electric ducted fan fixed-wing short take-off and landing aircraft in the short take-off and landing state wants to turn to level flight, it only needs to slowly turn the jet engine tail nozzles (4) of the left front wing (5), the right front wing (5), the left rear wing (7) and the right rear wing (7) backwards, and after the aircraft speeds up, turn to a horizontal rear position (or an approximately horizontal rear position, or a position similar to the horizontal rear position) to achieve normal level flight;

[0024] When the electric ducted fan type fixed-wing short take-off and landing aircraft is in level flight, the front wing (5) and the rear wing (7) are the main components for generating lift; the thrust of the electric ducted fan (3) is mainly used to overcome the resistance encountered by the aircraft during flight, and the resistance is generally much smaller than the gravity of the electric ducted fan type fixed-wing short take-off and landing aircraft, so the flight efficiency is high;

[0025] When the electric ducted fan type fixed-wing short take-off and landing aircraft is in a level flight state, the jet engine tail nozzles (4) of the left front wing (5), the right front wing (5), the left rear wing (7) and the right rear wing (7) are rotated to a horizontal rear position (or approximately to a horizontal rear position, or a position similar to a horizontal rear position), and the thrust of the electric ducted fan (3) is used to overcome the resistance encountered by the aircraft during flight; the thrust of the electric ducted fan (3) at the four locations can be controlled to achieve the control of the electric ducted fan type fixed-wing short take-off and landing aircraft in level flight, such as pitching up and down, turning left and right, and maintaining the state;

[0026] When the electric ducted fan fixed-wing short take-off and landing aircraft is in a uniform straight-line level flight state, the resultant lift force generated by the aircraft is equal to the gravity; the thrust of the electric ducted fan (3) of the left front wing (5), the right front wing (5), the left rear wing (7), and the right rear wing (7) and the lift of the left front wing (5), the right front wing (5), the left rear wing (7), and the right rear wing (7) acting on the aircraft, the sum of the pitch moments is zero, the sum of the yaw moments is zero, and the sum of the rolling moments is zero; the resultant thrust of the electric ducted fan (3) of the left front wing (5), the right front wing (5), the left rear wing (7), and the right rear wing (7) is equal to the resistance encountered by the aircraft during flight;

[0027] When the electric ducted fan fixed-wing short take-off and landing aircraft is about to roll to the left in the level flight phase, the lift of the left front wing (5) and the left rear wing (7) is reduced or the lift of the right front wing (5) and the right rear wing (7) is increased;

[0028] When the electric ducted fan fixed-wing short take-off and landing aircraft is about to roll to the right in the level flight phase, the lift of the left front wing (5) and the left rear wing (7) is increased or the lift of the right front wing (5) and the right rear wing (7) is reduced;

[0029] When the electric ducted fan fixed-wing short take-off and landing aircraft needs to pitch up (raise its head) during the level flight phase, the lift of the left front wing (5) and the right front wing (5) is increased, or the lift of the left rear wing (7) and the right rear wing (7) is reduced; if the thrust of the electric ducted fan (3) of the left front wing (5) and the right front wing (5) is above the center of gravity of the aircraft, and the thrust of the electric ducted fan (3) of the left rear wing (7) and the right rear wing (7) is below the center of gravity of the aircraft, the thrust of the electric ducted fan (3) of the left front wing (5) and the right front wing (5) may be reduced, or the thrust of the electric ducted fan (3) of the left rear wing (7) and the right rear wing (7) may be increased;

[0030] When the electric ducted fan fixed-wing short take-off and landing aircraft pitches down (lowers its head) in the level flight phase, the lift of the left front wing (5) and the right front wing (5) is reduced, or the lift of the left rear wing (7) and the right rear wing (7) is increased; if the thrust of the electric ducted fan (3) of the left front wing (5) and the right front wing (5) is above the center of gravity of the aircraft, and the thrust of the electric ducted fan (3) of the left rear wing (7) and the right rear wing (7) is below the center of gravity of the aircraft, the thrust of the electric ducted fan (3) of the left front wing (5) and the right front wing (5) may be increased, or the thrust of the electric ducted fan (3) of the left rear wing (7) and the right rear wing (7) may be reduced;

[0031] When the electric ducted fan fixed-wing short take-off and landing aircraft is turning left in the level flight phase, the thrust of the electric ducted fan (3) of the left front wing (5) and the left rear wing (7) is reduced or the thrust of the electric ducted fan (3) of the right front wing (5) and the right rear wing (7) is increased;

[0032] When the electric ducted fan fixed-wing short take-off and landing aircraft is turning right in the level flight phase, the thrust of the electric ducted fan (3) of the left front wing (5) and the left rear wing (7) is increased or the thrust of the electric ducted fan (3) of the right front wing (5) and the right rear wing (7) is reduced;

[0033] When the electric ducted fan fixed-wing short take-off and landing aircraft is in the level flight stage, the lift of the left front wing (5), the right front wing (5), the left rear wing (7), and the right rear wing (7) can be adjusted by controlling the ailerons of the left front wing (5), the right front wing (5), the left rear wing (7), and the right rear wing (7) or the tail nozzle (4) of the jet engine to deflect downward by a certain angle;

[0034] When the electric ducted fan type fixed-wing short take-off and landing aircraft is in a level flight state, the jet engine tail nozzles (4) of the left front wing (5), the right front wing (5), the left rear wing (7), and the right rear wing (7) can be respectively controlled to deflect downward by a certain angle, so that the high-speed airflow ejected from the electric ducted fan (3) passes through the jet engine tail nozzles (4) deflected downward by a certain angle, thereby generating a downward thrust component, thereby generating an upward reaction force, providing additional lift to the electric ducted fan type fixed-wing short take-off and landing aircraft, achieving left and right rolling, maintaining a state, etc., and being able to fly at a low speed;

[0035] Flight control system (2) is used to operate and control the aircraft. Since the control requirements of electric ducted fan fixed-wing short take-off and landing aircraft are complex and precise, computer-aided control systems are often used. This is conducive to unmanned operation, and relevant personnel do not need to obtain a pilot's license, which reduces the cost of use.

[0036] The electric ducted fan fixed-wing short take-off and landing aircraft uses the power battery (6) as a power source for flight, does not burn fuel, and the emission of pollutants such as CO, NO2, and unburned hydrocarbons is zero, the carbon emission is extremely low, energy-saving and environmentally friendly, and the use cost is low;

[0037] The electric ducted fan fixed-wing short take-off and landing aircraft has a simple structure, relatively low material performance requirements, relatively low manufacturing process requirements, low maintenance difficulty, and low use cost.

[0038] Unless otherwise defined, the technical terms or scientific terms used in the description of this application shall be the common meanings understood by the general technicians in the field to which this application belongs. In the description of this application, the terms "outer", "inner", "a section", "a level", "import", "export", "axial", "tangential", "inner diameter", "outer diameter", "interlaced", "corresponding", "circumference", "certain", "last", etc. indicate the position or position relationship, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the devices and elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, "first level", "next level", "step by step", "a module unit", "last level" and similar terms are only used for descriptive purposes to distinguish different components, and cannot be understood as indicating or implying relative importance. The words "one", "a level" and the like used in the description of this application should not be understood as an absolute limitation on the number, but should be understood as the existence of at least one. The words "deflected downward 90 degrees", "horizontally backward" and the like used in the description of this application should not be understood as an absolute limitation on the degree, but should be understood as including "deflected downward 90 degrees" and "horizontally backward". The words "including", "or", "or" and the like used in the description of this application mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects;

[0039] In addition, it should be noted that, unless otherwise clearly stipulated and limited, the words "connect", "assembly", "installation", "combination", "connection" and similar words used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the short take-off and landing of the electric ducted fan fixed-wing short take-off and landing aircraft provided in an embodiment of the present application;

[0041] Figure 2 This is a schematic diagram of the electric ducted fan fixed-wing short take-off and landing aircraft provided in an embodiment of the present application during level flight;

[0042] Figure 3 It is a schematic diagram of the tail nozzle of the jet engine of the electric ducted fan fixed-wing short take-off and landing aircraft provided in the embodiment of the present application being deflected downward by a certain angle during level flight;

[0043] Among them: 1-fuselage, 2-flight control system, 3-electric ducted fan, 4-jet engine tail nozzle, 5-front wing, 6-power battery, 7-rear wing.

[0044] In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; in addition, the drawings are used for illustrative purposes, and the terms describing the positional relationships therein are limited to illustrative purposes and cannot be understood as limitations on this patent. DETAILED DESCRIPTION

[0045] The specific embodiments described herein are only some embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0046] The following is a supplementary description of this application in conjunction with the accompanying drawings;

[0047] Figure 1 , Figure 2 , Figure 3 In the implementation example, the power battery (6) is installed on the wing, and the power battery (6) is used as a power source for flight, which significantly reduces the emission of pollutants such as CO, NO2, and unburned hydrocarbons, and also reduces carbon emissions and reduces the cost of use; the front wing (5) adopts an upper wing structure, which is simple in structure and has a wider downward field of view; the rear wing (7) adopts a mid-wing structure, which is closer to the ground and convenient for setting up a landing gear compartment; the wingspan of the front wing (5) and the rear wing (7) is much shorter than that of a traditional fixed wing, and the manufacturing difficulty is lower and the cost is lower;

[0048] like Figure 1As shown, the jet engine tail nozzles (4) of the left front wing (5), the right front wing (5), the left rear wing (7) and the right rear wing (7) are all deflected downward by 90 degrees (or similar to 90 degrees), and the take-off and landing, pitching, left and right rolling of the electric ducted fan type fixed-wing short take-off and landing aircraft are controlled by controlling the thrust of the electric ducted fan (3) at the four locations;

[0049] like Figure 2 As shown, the left front wing (5), the right front wing (5), the left rear wing (7) and the jet engine tail nozzle (4) of the right rear wing (7) are rotated to a horizontal rearward position (or a similar horizontal rearward position), and the thrust of the electric ducted fan (3) is used to overcome the resistance encountered by the aircraft during flight; the thrust of the electric ducted fan (3) at the four locations can be controlled to achieve the control of the pitch, left and right turn, and maintenance of the electric ducted fan type fixed-wing short take-off and landing aircraft during level flight;

[0050] like Figure 3 As shown, when the electric ducted fan type fixed-wing short take-off and landing aircraft is in a level flight state, the jet engine tail nozzles (4) of the left front wing (5), the right front wing (5), the left rear wing (7), and the right rear wing (7) can be respectively controlled to deflect downward by a certain angle, so that the high-speed airflow ejected from the electric ducted fan (3) passes through the jet engine tail nozzle (4) deflected downward by a certain angle, thereby generating a downward thrust component, thereby generating an upward reaction force, providing additional lift to the electric ducted fan type fixed-wing short take-off and landing aircraft, achieving left and right rolling, maintaining state, etc., and being able to fly at a low speed;

[0051] The electric ducted fan fixed-wing short take-off and landing aircraft has no tail, which reduces weight and has a lower cost;

[0052] The electric ducted fan fixed-wing short take-off and landing aircraft does not need to consider the control torque of the tail wing, and the fuselage (1) can be made shorter, which reduces the weight and reduces the cost;

[0053] The electric ducted fan fixed-wing short take-off and landing aircraft has high flight efficiency and high flight speed. It can also fly at an extremely slow speed and can take off and land in a short distance. It can perform tasks that require rapid arrival at the destination, search, and return.

Claims

1. An electric ducted fan fixed-wing short take-off and landing aircraft, characterized in that: The electric ducted fan type fixed-wing short take-off and landing aircraft comprises a fuselage (1), a flight control system (2), an electric ducted fan (3), a jet engine tail nozzle (4), a front wing (5), a power battery (6), and a rear wing (7).

2. The electric ducted fan fixed-wing short take-off and landing aircraft according to claim 1, characterized in that: The main function of the fuselage (1) is to carry equipment, passengers, cargo, etc., and to connect components such as a flight control system (2), an electric ducted fan (3), a jet engine tail nozzle (4), a front wing (5), a power battery (6), and a rear wing (7) into a whole; the flight control system (2) is used to operate and control the aircraft.

3. An electric ducted fan fixed-wing short take-off and landing aircraft according to any one of the preceding claims, characterized in that: The electric ducted fan (3) is an electrically driven ducted fan structure. The driving motor drives the fan to rotate at a high speed, accelerates the air to be ejected to obtain thrust, and overcomes the resistance encountered by the aircraft during flight. The jet engine tail nozzle (4) can be deflected downward by 90 degrees (or approximately 90 degrees, or similar to 90 degrees) or more. When the electric ducted fan type fixed-wing short take-off and landing aircraft is to take off and land short distances, the jet engine tail nozzle (4) is deflected downward by 90 degrees (or approximately 90 degrees, or similar to 90 degrees), and the relatively high-speed airflow ejected from the electric ducted fan (3) is deflected downward by 90 degrees. The jet engine tail nozzle (4) is angled at 90 degrees (or about 90 degrees, or similar to 90 degrees) to generate a downward thrust, thereby generating an upward reaction force, thereby providing lift for the electric ducted fan type fixed-wing short take-off and landing aircraft; the air inlet of the electric ducted fan (3) is directly facing the front airflow in the level flight state (i.e., forward toward the level flight direction, or similar to forward toward the level flight direction). Since the electric ducted fan (3) does not require air to participate in combustion, the rear electric ducted fan (3) will not be greatly affected if it inhales the air discharged by the front electric ducted fan (3).

4. An electric ducted fan fixed-wing short take-off and landing aircraft according to any one of the preceding claims, characterized in that: The front wing (5) is located at the front part (or close to the front part) of the fuselage (1), and the rear wing (7) is located at the rear part (or close to the rear part) of the fuselage (1). When the electric ducted fan fixed-wing short take-off and landing aircraft is flying level, the front wing (5) and the rear wing (7) are the main components for generating lift.

5. An electric ducted fan fixed-wing short take-off and landing aircraft according to any one of the preceding claims, characterized in that: The front wing (5) on the left, the front wing (5) on the right, the rear wing (7) on the left and the rear wing (7) on the right are each equipped with one (or several) (or a group) of the electric ducted fans (3) and the jet engine tail nozzle (4).

6. An electric ducted fan fixed-wing short take-off and landing aircraft according to any one of the preceding claims, characterized in that: When the electric ducted fan type fixed-wing short take-off and landing aircraft is to perform a short take-off and landing, the jet engine tail nozzles (4) of the left front wing (5), the right front wing (5), the left rear wing (7) and the right rear wing (7) are all deflected downward by 90 degrees (or approximately 90 degrees, or similar to 90 degrees), and the take-off and landing, pitching, left and right rolling, etc. of the electric ducted fan type fixed-wing short take-off and landing aircraft are controlled by controlling the thrust of the electric ducted fan (3) at the four locations.

7. An electric ducted fan fixed-wing short take-off and landing aircraft according to any one of the preceding claims, characterized in that: When the electric ducted fan fixed-wing short take-off and landing aircraft in the short take-off and landing state wants to turn to level flight, it only needs to slowly turn the jet engine tail nozzles (4) of the left front wing (5), the right front wing (5), the left rear wing (7) and the right rear wing (7) backwards, and after the aircraft speeds up, turn it to a horizontal rear position (or an approximately horizontal rear position, or a similar horizontal rear position) to achieve normal level flight.

8. An electric ducted fan fixed-wing short take-off and landing aircraft according to any one of the preceding claims, characterized in that: When the electric ducted fan type fixed-wing short take-off and landing aircraft is in a level flight state, the jet engine tail nozzles (4) of the left front wing (5), the right front wing (5), the left rear wing (7) and the right rear wing (7) are rotated to a horizontal rear position (or approximately a horizontal rear position, or a similar horizontal rear position), and the thrust of the electric ducted fan (3) is used to overcome the resistance encountered by the aircraft during flight; by controlling the thrust of the electric ducted fan (3) at the four locations, the electric ducted fan type fixed-wing short take-off and landing aircraft can be controlled to pitch up and down, turn left and right, maintain the state, etc. during level flight.

9. An electric ducted fan fixed-wing short take-off and landing aircraft according to any one of the preceding claims, characterized in that: When the electric ducted fan fixed-wing short take-off and landing aircraft is in a level flight state, the jet engine tail nozzle (4) of the left front wing (5), the right front wing (5), the left rear wing (7), and the right rear wing (7) can be respectively controlled to deflect downward by a certain angle to generate additional lift, thereby achieving left and right rolling, state maintenance, etc., and can fly at a low speed.

10. An electric ducted fan fixed-wing short take-off and landing aircraft according to any one of the preceding claims, characterized in that: The power battery (6) is a power source that provides a power source for the aircraft.

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