The invention refers to a VTOL aircraft of the type that uses certain aerodynamic phenomena to increase the lifting force and to reduce the thrust/weight ratio. An aircraft 1 uses a propulsion system 2 consisting of four thrust producing elements, two in front 3 and two in rear 4. Each front thrust producing element 3 contains at least one front rotor 5 operated by at least one front electric motor, fixed on a fuselage 10. Each rear thrust producing element 4 contains at least one rear rotor 7 driven by at least a rear electric motor 8, fixed on the fuselage 10. On the fuselage 10 is attached symmetrically a front wing 12. On the fuselage 10 is attached symmetrically a rear wing 13. The wing 12 and 13 are used also in static conditions respectively in take-off and landing.

The unmanned aerial vehicle (UAV) includes detachable motor arms. In this way, the UAV may be conveniently stored and transported, rapidly assembled in the field, and repaired in the event of a crash. The motor arms are also configured to separate from the fuselage in the event of a crash. An example unmanned aerial vehicle comprises: a fuselage and two motor arms. Each motor arm is detachably secured to the fuselage by two mechanical connectors and comprises a tube having a rotary wing propulsion system on each end and an electrical connector, positioned between the two rotary wing propulsion systems, configured to conductively interface with an electrical connector in an underside of the fuselage. The two mechanical connectors detachably securing each motor arm to the fuselage are configured to facilitate the separation of that motor arm from the fuselage during a crash.

The unmanned aerial vehicle (UAV) includes detachable motor arms. In this way, the UAV may be conveniently stored and transported, rapidly assembled in the field, and repaired in the event of a crash. The motor arms are also configured to separate from the fuselage in the event of a crash. An example unmanned aerial vehicle comprises: a fuselage and two motor arms. Each motor arm is detachably secured to the fuselage by two mechanical connectors and comprises a tube having a rotary wing propulsion system on each end and an electrical connector, positioned between the two rotary wing propulsion systems, configured to conductively interface with an electrical connector in an underside of the fuselage. The two mechanical connectors detachably securing each motor arm to the fuselage are configured to facilitate the separation of that motor arm from the fuselage during a crash.

A tie-down for attachment to an aft tail section of an aircraft for inhibiting damage to the aircraft when the aircraft is on the ground is disclosed. The tie-down has a mount member configured to attach to the aft tail section and a projection member supported by the mount member. The projection member extends in a generally downward direction from the mount member so as to provide a contact surface with the ground that is lower than the aft tail section.

Disclosed embodiments include a blown flying wing tailsitter aircraft leveraging distributed electric propulsion to enable a combination of exceptional aerodynamic performance and high bandwidth control in both vertical (hovering) and horizontal flight. A pilot in one disclosed embodiment may be in the prone position during cruise and standing during vertical flight phase to enable greater aerodynamic efficiency with minimal engineering complexity and a small landing footprint. Batteries may be disposed in a high-volume wing sealed off from the piloted compartment to increase the safety of the pilot while distributing the inertial load of batteries and motors across the wingspan, thus enabling a lighter and simpler structure. Propellers may be above head-level for operational safety when the aircraft is standing on the ground.

Disclosed is a ground movement system for a helicopter having a fuselage and rotor blades fixed to the top of the fuselage, the ground movement system comprising at least three wheels secured below the fuselage of the helicopter, the wheels being retractable during flight; a motor positioned in the hub or on the undercarriage leg of each of at least two of the wheels, wherein each motor is operable to rotate the wheel in forward and backward directions; wherein each motor allows the wheel to rotate freely when unpowered; at least one user interface operable to receive user input commands to control the speed and direction of travel of the helicopter using the ground movement system; and a control arrangement to provide control signals to each of the motors based on the user input commands.

The invention relates to a method for controlling an aircraft taxi system, comprising the steps of: generating a traction command (Com) to control an electric motor of a wheel drive actuator; detecting whether or not an external brake command, intended to control braking of the wheel via the brake, is generated; if an external braking command is generated, producing a predetermined minimum command (Cmp) to control the electric motor so that the drive actuator applies a strictly positive predetermined minimum motor torque to the wheel during braking; detecting whether a speed of the aircraft becomes zero and, if so, inhibiting the predetermined minimum command (Cmp) so that the drive actuator applies zero torque to the wheel.

A VTOL (vertical take-off and landing) box-wing aerial vehicle with multirotor to provide VTOL flight includes a detachable cabin, centered fuselage, a pair of first wings extending outward from the upper portion of the fuselage and a pair of second wings extending outwardly and from the lower portion of the fuselage. The first and second wings are spaced apart longitudinally and vertically. The pylon joints the first wing and second wing at the tip to form the box-wing. The pylon includes heading control rudder. Secured to the wing or pylon or both wing and pylon, an overhead boom extending longitudinally to support a plurality of lift rotors or tiltable rotors for VTOL flight. Finally, the overhead boom mounted tiltable rotors propel the vehicle forward to generate lift from the wings. Furthermore, the wings are equipped with elevators and ailerons for flight control.

A VTOL (vertical take-off and landing) box-wing aerial vehicle with multirotor to provide VTOL flight includes a detachable cabin, centered fuselage, a pair of first wings extending outward from the upper portion of the fuselage and a pair of second wings extending outwardly and from the lower portion of the fuselage. The first and second wings are spaced apart longitudinally and vertically. The pylon joints the first wing and second wing at the tip to form the box-wing. The pylon includes heading control rudder. Secured to the wing or pylon or both wing and pylon, an overhead boom extending longitudinally to support a plurality of lift rotors or tiltable rotors for VTOL flight. Finally, the overhead boom mounted tiltable rotors propel the vehicle forward to generate lift from the wings. Furthermore, the wings are equipped with elevators and ailerons for flight control.

A landing gear for a flight vehicle is used during landing. The landing gear for a flight vehicle includes a first cylinder structure configured to have an upper end which is coupled to be able to roll with respect to the flight vehicle; and a second cylinder structure configured to have a lower end which is able to come into contact with the ground, configured to be able to relatively move in an axial direction along a reference axis with respect to the first cylinder structure, and configured to be able to relatively rotate about the reference axis with respect to the first cylinder structure. The first cylinder structure and the second cylinder structure switch the landing gear between a stowed state and a released state by means of the relative movement and the relative rotation.