A helicopter has a mast axis and a rotorcraft blade assembly. The rotorcraft blade assembly has a main body and a blade tip movable relative to the main body. The rotorcraft blade assembly is selectively rotatable about the mast axis.

A helicopter has a mast axis and a rotorcraft blade assembly. The rotorcraft blade assembly has a main body and a blade tip movable relative to the main body. The rotorcraft blade assembly is selectively rotatable about the mast axis.

An unmanned aerial vehicle having an airframe whose horizontal dimension is efficiently reduced. This object is solved by an unmanned aerial vehicle that includes: a rotor; an arm; and an arm connector. The arm connector includes an arm holder that is a fixing member holding a part of the arm in a longitudinal direction of the arm. The part of the arm held by the arm holder is changeable by sliding the arm in the longitudinal direction of the arm relative to the arm holder. The arm holder is a movable member movable in directions in which the arm is turned upward and downward and/or rightward and leftward. The object is also solved by an unmanned aerial vehicle that includes: a rotor; an arm; and an arm connector. The arm is provided with a hinge on which the arm is foldable at a middle portion of the arm.

An unmanned aerial vehicle having an airframe whose horizontal dimension is efficiently reduced. This object is solved by an unmanned aerial vehicle that includes: a rotor; an arm; and an arm connector. The arm connector includes an arm holder that is a fixing member holding a part of the arm in a longitudinal direction of the arm. The part of the arm held by the arm holder is changeable by sliding the arm in the longitudinal direction of the arm relative to the arm holder. The arm holder is a movable member movable in directions in which the arm is turned upward and downward and/or rightward and leftward. The object is also solved by an unmanned aerial vehicle that includes: a rotor; an arm; and an arm connector. The arm is provided with a hinge on which the arm is foldable at a middle portion of the arm.

A UAV (unmanned aerial vehicle) arm mechanism includes an arm fixed device, a control device, a limiting device, and an arm connecting device, wherein the control device is adapted for controlling an assembly and disassembly of the arm fixed device and the arm connecting device, the limiting device is adapted for relatively fixing the arm fixed device and the arm connecting device; the control device is adapted for driving the limiting device to be detached from the arm connecting device, so as to achieve that the arm fixed device and the arm connecting device switch among at least three different states through a relative rotation. The UAV and the UAV arm mechanism can be locked up through the positioning pins, and also can be folded and disassembled after pressing the controlling device.

A UAV (unmanned aerial vehicle) arm mechanism includes an arm fixed device, a control device, a limiting device, and an arm connecting device, wherein the control device is adapted for controlling an assembly and disassembly of the arm fixed device and the arm connecting device, the limiting device is adapted for relatively fixing the arm fixed device and the arm connecting device; the control device is adapted for driving the limiting device to be detached from the arm connecting device, so as to achieve that the arm fixed device and the arm connecting device switch among at least three different states through a relative rotation. The UAV and the UAV arm mechanism can be locked up through the positioning pins, and also can be folded and disassembled after pressing the controlling device.

A tandem tiltrotor aircraft in which the tiltrotor assemblies are operably coupled at the forward and aft ends of the fuselage of the aircraft is disclosed. The tiltrotor assemblies are capable of rotating between a vertical lift position and a horizontal flight position. The in-line location of the tiltrotor assemblies allow the aircraft to have the vertical take-off and landing capabilities, and, in combination with the at least one wing, can be used in horizontal flight. The nacelles can be disposed on the fuselage they are coaxial in forward flight and do not add to the drag profile like wing-tip nacelles would. When wing-borne flight is desired some or all of the rotors can rotate down so the thrust vector is in a generally horizontal plane.

A tandem tiltrotor aircraft in which the tiltrotor assemblies are operably coupled at the forward and aft ends of the fuselage of the aircraft is disclosed. The tiltrotor assemblies are capable of rotating between a vertical lift position and a horizontal flight position. The in-line location of the tiltrotor assemblies allow the aircraft to have the vertical take-off and landing capabilities, and, in combination with the at least one wing, can be used in horizontal flight. The nacelles can be disposed on the fuselage they are coaxial in forward flight and do not add to the drag profile like wing-tip nacelles would. When wing-borne flight is desired some or all of the rotors can rotate down so the thrust vector is in a generally horizontal plane.

An unmanned aerial vehicle includes a fuselage and a plurality of arm assemblies disposed at the fuselage. Each arm assembly includes an arm connected to the fuselage and a drive mechanism for driving the arm to rotate. The arm includes an unfolded state and a folded state. Each drive mechanism is configured to drive a corresponding arm to rotate relative to the fuselage and to enable a switching between the unfolded state and the folded state of the corresponding arm.

An unmanned aerial vehicle includes a fuselage and a plurality of arm assemblies disposed at the fuselage. Each arm assembly includes an arm connected to the fuselage and a drive mechanism for driving the arm to rotate. The arm includes an unfolded state and a folded state. Each drive mechanism is configured to drive a corresponding arm to rotate relative to the fuselage and to enable a switching between the unfolded state and the folded state of the corresponding arm.