Available wind-tunnel data on the low-speed hori¬zontal-tail contribution to the static longitudinal stability of high-speed airplane configurations in¬corporating unswept and sweptback wings are reviewed and analyzed. The characteristics of the flow behind wings and wing-body combinations are described and related to the dovmwash at specific tail locations for unseparated, and separated flow condi¬tions. The effects of variations of tail position, variations of wing plan form and airfoil section, trailing-edge flaps, stall-control devices, and ground interference on the air-flow characteristics and tail contribution are analyzed and demonstrated. The more favorable tail arrangements are emphasized and their application to specific configurations is illus-trated.
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