| 摘要 |
An airfoil having improved aerodynamic characteristics has a leading edge and a trailing edge longitudinally spaced therefrom. A continuous lower surface of the air foil forms a lower camber extending from the leading edge to the trailing edge. The upper surface of the air foil has a first fixed upper surface extending rearwardly from the leading edge and terminating in an offset and a second upper surface extends rearwardly therefrom and is movable from a first position defining a first upper camber portion of the airfoil to a second position defining a second upper camber portion thereof.
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