An aircraft wing and method of operating an aircraft wing comprises a fixed wing 7 and a wing tip device 9 rotatably mounted on a hinge 11 at a tip of the fixed wing. An actuation system 20 rotates the wing tip device about the hinge, and the actuation system comprises a motor 22, at least one geared rotary actuator 24, and a clutch 28 for selectively decoupling rotation of the motor from rotation of the geared rotary actuator. A reduction gearbox 26 is disposed between the clutch and the geared actuator along a drive train between the motor and the geared actuator. The gearbox may be back driveable when the clutch is disengaged. A plurality of geared actuators arranged along the hinge may be used. The actuation system may comprise a brake 23 preventing motion of the geared actuator(s) when the clutch is engaged. The actuation system may operate in a driving mode where the clutch is engaged and the motor drives rotation of the wing tip, a flapping mode where the clutch is disengaged and external forces rotate the wing tip, or a braked mode where the clutch is engaged and the brake prevents wing tip rotation.
Moveable wing tip actuation system
2025-01-08
Patent
Electronic Resource
English
IPC: | B64C AEROPLANES , Flugzeuge |