REPORT No. 883 FLIGHT MEASUREAIENTS OF THE LATERAL CONTROL CHARACTERISTICS OF NARROW-CHORD AILERONS ON THE TRAILING EDGE OF A FULL-SPAN SLOTTED FLAP

Results are presented oj @ight tests made to determine the <feet oj jlap de$ection on the lateral control characteristics of a modi$ed Brewster F2A-2 airplane equipped with partial-spa-n narrow-chord ailerons on the trailing edge oj a full-span NACA slotted -flap. The inrestiga~ion included determination of the rolling and yawing characteristics oj the airplane in abrupt aileron rolls with the slotted $ap at carious wftings ranging from (la to abouf @O. The results shorted that i’he e~ectireness of the ailerons was greatly reduced at $ap de$ection.s grea[er than about 2’0°. For .tiap defections up to about 90°, the aileron e$ectirene.ss UYLS about the same as with jlaps retracted, but the adr.erse yawing reloci@ dereloped in the abrupt aileron rolls was someu’hat increased. This increase in the adwrse yawing r~locity, lLo-LOerer, was not considered objec~ionable by the pilot.