Abstract: A wing assembly has a wing and at least one slender delta shaped flap with sharp leading edges pointing into the flow direction and deployable above the upper wing surface close to the quarter line of the wing for providing significantly enhanced lift and maneuverability to an aircraft. In normal flight the delta flaps are retracted into the wing such that the upper surface of the delta flaps become part of the upper surface of the wing. If higher lift is required or the wing has stalled, the delta flaps are deployed at an angle of attack into the high energy flow region outside the boundary layer of the upper wing surface, at a position relative to the wing that depends on the angle of attack of the wing. There the flaps generate strong and stable vortices at the sharp leading edges and a high pressure area between the lower surface of the delta flap and the upper wing surface resulting in a down draft and flow acceleration downstream of the flap.

Abstract: A measurement system for measuring discrete voltages of serially connected battery modules making up a battery power supply wherein there would be connected to each junction between cells one terminal of a dual-level voltage responsive switch and wherein the other terminal of each switch is connected to a common terminal. The switches are identical, and each would close at a first voltage across it and open at a second, slight higher, voltage. A ramp voltage is generated and connected from the common terminal and the high voltage terminal of the supply. The ramp voltage and current through this circuit are concurrently measured and displayed wherein the difference in voltage between the appearance of two current pulses is illustrative of the battery voltage of the battery module connected between switches giving rise to the current pulses.