| 摘要 |
A propeller comprising a hub and a plurality of fins extending radially outwards from the hub, wherein each fin is moveably connected to the hub such that, during rotation of the propeller, either the dihedral, the rake or both the dihedral and the rake of the fin(s) can be altered and controlled over a working range by movement of the fin(s) about one or more axes of rotation; and one or more actuators for controlling the dihe dral or rake of the fins independently of the pitch of the fins. |
