Power-operated tail-sitting type mixed layout vertical take-off and landing aircraft

Abstract

The invention discloses a power-operated tail-sitting type mixed layout vertical take-off and landing aircraft. The power-operated tail-sitting type mixed layout vertical take-off and landing aircraft is composed of a fuselage, airfoils, motors, propellers and landing gears; the fuselage axis coincides with the OX axis of a body axial system, the projections of the fuselage axis and the OX axis in an XOY plane of the body axial system are distributed in an X shape; each airfoil on the fuselage is divided into several sections, sweepback angles and dihedral angles of all the sections are different from one another, and excellent pneumatic performance and maneuvering performance are achieved through positively-curved airfoil profiles and negatively-curved airfoil profiles; four sets of propeller-motor power systems are installed on the four airfoils correspondingly, and the distances between the positions where the propeller-motor power systems are located and the OX axis of the body axial system are the same; and four power devices take off in an X-shaped quad-rotor mode in the vertical take-off and landing processes and complete conversion operation to enter a cruising state through different tensile forces of the motors or by being matched with maneuvering surfaces, and required maneuvering is completed through tensile force changing of the motors in the whole process. The power devices of the aircraft are simple, the control mode is reliable, propeller slipstreams can be effectively utilized, and the aircraft is suitable for serving as flying platforms of a tail-sitting type vertical take-off and landing unmanned aerial vehicle.

Description

technical field [0001] The invention relates to a vertical take-off and landing aircraft, in particular to a power-operated tail-sitting mixed layout vertical take-off and landing aircraft. Background technique [0002] The cruising speed flight envelope is the design goal that fixed-wing aircraft pays special attention to and pursues. Therefore, aircraft with vertical take-off and landing capabilities, fixed-point hovering capabilities, and fast cruising capabilities are the goals of today's era, especially in military aircraft and small It is more obvious in UAVs, such as the Osprey V-22 and F35 with American tilting rotors, and DJI's Phantom series rotors with a slightly slower cruise speed among small aircraft. They all rely on their unique vertical take-off and landing capabilities and hovering capabilities to get rid of the restrictions of the take-off and landing sites and attract the attention of the public. Tail-sit vertical take-off and landing aircraft is a uniqu...

AI Technical Summary

Problems solved by technology

For tail-sitting vertical take-off and landing aircraft, for example, the invention patent CN103979104A, in the process of vertical take-off and landing, the ground effect is serious and the flying speed of the aircraft is high, the rudder surface is basically ineffective, and only the weak rudder effect under the slipstream of the propeller can be relied on. Therefore, the use of movable control surfaces as a control method is very ineffective for the vertical take-off and landing process

In addition, when the deflection of the rudder surface realizes control, it also increases the trim resistance of the aircraft, which lowers the flight efficiency.

[0004] However, for the low Reynolds number fluid mechanism of small aircraft, for example, patent CN102133926B, it is generally necessary to use a reverse-curved airfoil to trim the aircraft to reduce cruise resistance. Aerodynamic efficiency is greatly reduced

In addition, in order to ensure the lateral stability of the aircraft, it is necessary to increase the vertical tail, which increases the weight and resistance in flight.

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