Patent ID: 6824109
Filing Date: 2004-11-30
Classification: B64C

Abstract:
An airfoil having at least one movable band is arranged on an upper surface and a lower surface moving from a front portion to a rear portion of said airfoil, said at least one available band being part of means for controlling changes in lift of said airfoil in accordance with the relationship:&Dgr;Lâˆ (RS1)2âˆ’(RSu)2; where &Dgr;L is a change in lift; RS1 is a relative speed of a lower portion of said band on a lower surface or said airfoil, and is equal to Sb+Sa, where Sa is airspeed and Sb is band speed; and, RSu is a relative speed of an upper portion of said band on an upper surface of said airfoil, and is equal to Sbâˆ’Sa, whereby lift increases by front to rear movement of said upper surface of said movable band.