FLIGHT INVESTIGATION OF THE LOW-SPEED CHARACTERLSTICS OF A 45° SWEPT-WING FIGHTER-TYPE AIRPLANE WITH BLOWING BOUNDARY-LAYER CONTROL APPLIED TO THE LEADING- AND TRAILLNG-EDGE FLAPS

摘要

The study has shown the minimum comfortable landing-approach speeds are between 120.5 and 126.5 knots compared to 134 for the airplane with a slatted leading edge and the same trailing-edge flap. The limiting factors in the pilots' choices of landing-approach speeds were the limits of ability to control flight-path angle, lack of visibility, trim change with thrust, low static directional stability, and sluggish longitudinal control. Several of these factors were found to be associated with the high angles of attack, between 13° and 15°, required for the low approach speeds. The angle of attack for maximum lift coefficient was 28°.