A landing gear system includes a drive shaft extending through an axle. A wheel with a drive surface is rotatably coupled to the axle. A drive assembly, which has disengaged and engaged states, includes a drive element and an idler element. The drive element, which has an engagement feature, is coupled to the drive shaft for rotation about an axis. The engagement feature has first and second diameters when the drive assembly is in the disengaged and engaged states, respectively. The idler element is frictionally engaged with the engagement feature of the drive element to transfer rotation of the drive element to the wheel when the drive assembly is in the engaged state. The idler element is disengaged from at least one of the engagement feature of drive element and the wheel when the drive assembly is in the disengaged state.

A biplane flying device includes a fuselage, an upper wing, a lower wing, a first propulsion assembly and a second propulsion assembly. The upper wing is connected to one side of the fuselage. The upper wing has a first end and a second end opposite to each other. The lower wing is connected to the fuselage and opposite to the upper wing. The lower wing has a third end and a fourth end opposite to each other. The first end is opposite to the third end, and the second end is opposite to the fourth end. The first propulsion assembly is connected between the first end, the third end and the fuselage. The second propulsion assembly is connected between the second end, the fourth end and the fuselage.

A biplane flying device includes a fuselage, an upper wing, a lower wing, a first propulsion assembly and a second propulsion assembly. The upper wing is connected to one side of the fuselage. The upper wing has a first end and a second end opposite to each other. The lower wing is connected to the fuselage and opposite to the upper wing. The lower wing has a third end and a fourth end opposite to each other. The first end is opposite to the third end, and the second end is opposite to the fourth end. The first propulsion assembly is connected between the first end, the third end and the fuselage. The second propulsion assembly is connected between the second end, the fourth end and the fuselage.

In a wheeled landing gear of an aircraft, an axle sleeve 10 that includes a low friction wear surface 19 on a portion of an internal surface of the axle sleeve. The low friction wear surface 19 includes a ring 20 of composite material including fibres in a polymer matrix.

In a wheeled landing gear of an aircraft, an axle sleeve 10 that includes a low friction wear surface 19 on a portion of an internal surface of the axle sleeve. The low friction wear surface 19 includes a ring 20 of composite material including fibres in a polymer matrix.

An aircraft braked wheel comprising a rim integral with a hub for rotationally mounting thereof on an axle of the aircraft along an axis of rotation, the wheel being equipped with a heat shield (11) extending opposite an inner face of the rim to protect the rim from the thermal radiation generated by a stack of discs extending inside the rim, characterized in that the heat shield has a face facing the discs (15) which has longitudinal ribs (16) extending in operation parallel to the axis of rotation of the wheel.

An aircraft braked wheel comprising a rim integral with a hub for rotationally mounting thereof on an axle of the aircraft along an axis of rotation, the wheel being equipped with a heat shield (11) extending opposite an inner face of the rim to protect the rim from the thermal radiation generated by a stack of discs extending inside the rim, characterized in that the heat shield has a face facing the discs (15) which has longitudinal ribs (16) extending in operation parallel to the axis of rotation of the wheel.

An aircraft includes: an aircraft body including rotating wings and motors that rotates the rotating wings; wheels arranged on both sides of the aircraft body and rotatably supported around an axis that extends in a left and right direction of the aircraft body; rollers that protrude forward and upward with respect to each of the wheels when the aircraft body is in a horizontal state, and are rotatably supported around an axis that extends in a tangential direction of each of the wheels; and a controller that controls a rotation speed of the motors such that, when the aircraft body is moved in the left and right direction along a vertical wall surface, the aircraft body is inclined forward to bring the rollers into contact with the vertical wall surface, and the aircraft body is inclined to a side where the aircraft body moves in the left and right direction.

An aircraft includes: an aircraft body including rotating wings and motors that rotates the rotating wings; wheels arranged on both sides of the aircraft body and rotatably supported around an axis that extends in a left and right direction of the aircraft body; rollers that protrude forward and upward with respect to each of the wheels when the aircraft body is in a horizontal state, and are rotatably supported around an axis that extends in a tangential direction of each of the wheels; and a controller that controls a rotation speed of the motors such that, when the aircraft body is moved in the left and right direction along a vertical wall surface, the aircraft body is inclined forward to bring the rollers into contact with the vertical wall surface, and the aircraft body is inclined to a side where the aircraft body moves in the left and right direction.

An aircraft landing gear bogie beam including first and second ends and a mounting bearing for connection to an aircraft landing gear main strut between the ends. Each end has a respective axle, and each axle defines a wheel mounting portion on each side of the bogie beam. The bogie beam is arranged to enable the first and second axles to each pivot relative to the bearing about a respective longitudinal axis of the bogie beam by an amount that is sufficient to place a wheel rim of a wheel assembly in contact with the ground in the event of a tyre of the wheel assembly deflating.