Accession Number : ADD000003

Title :   Minimum Drag Circulation Profile.

Descriptive Note : Patent,


Personal Author(s) : Williams,Robert M

Report Date : 04 Sep 1973

Pagination or Media Count : 5

Abstract : The patent relates to an airfoil chord which is divided into five sections, each section producing a specialized flow over its respective surface. A first section extending from the leading edge to approximately the midpoint of the chord has a convex shape and produces laminar flow. The second section adjacent the first has a straight line surface with a negative slope which produces a transition from laminar flow to a turbulent flow. The turbulent flow region is followed by a region of minimum skin friction which has a concave surface. The chord trailing edge is a coanda profile. A tangential jet slot is placed at the trailing edge to blow over and around the coanda profile preventing flow separation and moving the stagnation region aft on the wing. The under surface is cambered to reduce the flow velocity.

Descriptors :   *Airfoils, *Aerodynamic configurations, *Patents, Leading edges, Boundary layer flow, Trailing edge, Wings, Aerodynamic characteristics

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE