EFFECT OF 40° SWEEPBACK ON THE SPIN ANDnRECOVERY CHARACTERISTICS OF A 1/25-SCALE MODEL OF A TYPICAL FIGHTER-TYPE AIRPLANE AS DETERMINED BY FREE-SPINNING-TUNNEL TESTS

摘要

Free-spinning-turmel tests have been performed with a model of a typical fighter-type airplane to determine the effect of 40° sweepback on the spin and recovery characteristics. The spin and recovery characteristics of the model for both a swept-wing and an unwept-wing configuration were obtained for a range of typicalfighter loading conditions and for two tail designs. The investiation included tests of two wing-tip shapes on the swept-back wing.nThe results of the tests indicated that for the model with a tail design considered unsatisfactory as regards spin recovery, sweeping the wings back 40° improved the recovery characteristics appreciably.