| 摘要 |
Embodiments of the invention relate to blades (10)for turbines, such as wind turbines, comprising a structural frame (24) with a sail (12) mounted thereon. In certain embodiments, a portion of the frame (16, 20) contributes to the buoyancy of the blade. In further embodiments, the frame comprises strengthening cords (46, 48). In further embodiments, the frame comprises a reinforced tip. In further embodiments, the blade has a tip (84) arranged to articulate relative to a body portion (82) to alter the aerodynamic profile of the blade as the blade rotates to thereby assist up-strokes of the blade. |
