Development of a fluidic rudder

Wind tunnel tests were performed to examine the concept of aircraft controls without moving parts, and aircraft stabilization by means of scoop-fed slots. Results of wind tunnel tests, in the framework of a NASA program, to determine the force-control characteristics of a symmetrical airfoil with scoop-fed slots are discussed. Further tests showed that a fluidic amplifier could be built into the airfoil and operate with ram air. A fluidic rudder was then developed, consisting of cascaded fluidic amplifiers necessary to couple low-level fluidic sensors with slot flow control of the aerodynamic force on the vertical tail.