Trailing edge device for an airfoil
AssigneeLockheed Corporation
InventorJames A. Boyd
Life of this patent
Estimating the term…
Abstract
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.degree. and 45.degree.. 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).
Claims3
An improvement for a transonic airfoil of an aircraft or the like, said airfoil having a chord length defined by the leading and trailing edge of the airfoil, the improvement comprising:
- a wedge-shaped member rigidly mounted to the underside of the airfoil between 0 percent and 1.0 percent from the trailing edge, having a height of between 0.4 percent to 0.8 percent of the chord of the airfoil;
- and further having a wedge angle to the chord of between 15.degree. and 45.degree..
Dependencies are inferred from the claim text.