the airfoil surface according to motor commands from autopilots operators sensors and computers disk spoiler systems provide very rapid generation and retreat of controllable height barriers the management of bernoulli lift phenomenon with disk spoilers has unique use on an aircraft 39 s nose along the top of its wings on the forward surfaces of horizontal and vertical stabilizers and within the intake sections of gas turbine aircraft engines disks are rotated by electric rotor positioning motors and aircraft powered axial force systems application_number US 29757894 A description segmented spoiler barrier surfaces fig6 c amp 13c extend through an airfoil slot fig2 w 4w 12w 13w 15w amp 17w to form a composite barrier having multiple height fig1 1 2 3 4 5 patterns segmented surfaces include overlapping rotatable disks fig6 c2 7c2 8c2 and parallel sliding plates fig1 c3 14c3 barrier spoiler segments fig7 of a common surface slot aperture fig6 w are shaped to generate convex arcs fig7 c2 amp 12c2 their multiple installation on an aircraft 39 s convex nose surface fig9 f1 10y amp 12y provides a ring line of spoiler arcs fig1 c2 barrier spoiler segments fig1 1 of a flat common surface slot aperture fig4 c amp 6c are installed in a straight line along the forward areas of cantilever airfoil surfaces fig9 e5 amp 9c4 barrier spoiler segments fig8 within a common surface slot aperture are shaped to generate concave arcs fig8 c2 amp 17c2 a line of these arcs generate a concave ring line of spoiler arcs for the intake airfoil of jet engines fig9 g1 amp 17z parallel sliding plates fig1 c3 14c3 15c3 amp 16j2 are arranged within individual surface slots and bearings to match straight convex and concave.