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Wind-Tunnel Investigation of a Low-Drag Airfoil Section with a Double Slotted Flap

S. M. Bogdonoff

Abstract

Tests were made of an 0.309-chord double-slotted flap on an NACA 65, 3-118, a equals 1.0 airfoil section to determine drag, lift, and pitching-moment characteristics for a range of flap deflections. Results indicate that combination of a low-drag airfoil and a double-slotted flap, of which the two parts moved as a single unit, gave higher maximum lift coefficients than have been obtained with plain, split, or slotted flaps on low-drag airfoils. Pitching moments were comparable to those obtained with other high-lift devices on conventional airfoils for similar lift coefficients.

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Key concepts: Airfoil, Drag, Chord (peer-to-peer), Lift-to-drag ratio, Pitching moment, Aerodynamic center, Lift (data mining), Lift-induced drag