| 摘要 |
The invention is a small wedge shaped flap (20) for attachment to or near the trailing edge (14) of a airfoil (10) which improves the coefficient of lift and reduces the coefficient of drag providing an overall increase in fuel ecomony at cruise conditions. In detail the wedge shaped flap (20) has a downward height (26) of between 0.5 percent to 1.5 percent of the chord (16) of the airfoil (10) and has an included angle (30) to the chord of between 15 DEG and 45 DEG . The wedge flap is preferably placed at distance (24) of between 0 to 1.0 percent of the chord (16) from the trailing edge (14).
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