Laminar-flow airfoil

Details Laminar-flow airfoil Laminar-flow airfoil

2006-08-22

2006-08-22

Dinh, Tien (Department: 3644)

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

Reexamination Certificate

active

07093792

ABSTRACT:
An upper wing surface of a laminar-flow airfoil for decreasing an undesirable head-lowering pitching moment around an aerodynamic center of the airfoil. The upper wing surface includes: a convex front profile portion extending from a leading edge to a largest-thickness point located corresponding to 38% of a wing chord length. A convex central profile portion extends from the largest-thickness point to a position corresponding to 90% of the wing chord length at which a value obtained by dividing a thicknesswise difference between the position and the largest-thickness point by a distance in a direction of the wing chord from the largest-thickness point is equal to or smaller than 0.12. A concave rear profile portion extends from a position corresponding to 95% of the wing chord length to the trailing edge. The rear profile portion forms a pressure gradient is steeper than that formed by the central profile portion.

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