FLIGHT MEASUREMENTS OF THE LATERAL AND DIRECTIONAL STABILITY AND CONTROL CHARACTERISTICS OF AN AIRPLANE HAVING A 35° SWEPTBACK WING WITH 40-PERCENT-SPAN SLOTS AND A COMPARISON WITH WIND-TUNNEL DATA

摘要

Flight tests have been conducted to determine the lateral and directional Stability and control characteristics of an airplane on which the wing panels are swept back 35°.For these tests, the wings were equipped with slots extending from 40 to 80 percent of the span of the sweptback wing panels measured from the inboard end. Wind—tunnel tests were made of a model of the airplane and wherever possible the flight and wind—tunnel data have been compared.nThe directional stability was found to be positive with flaps up or down at all speeds tested. A large increase in dihedral effect with decrease in speed was noted, and the agreement between flight and wind-tunnel measurements of dihedral effect was excellent except at high normal—force coefficients. Oscillations of the airplane and rudder resulting from abrupt deflection and release of the rudder were satis¬factorily damped in all cases.