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Stall Characteristics Obtained from Flight 10 of Northrop X-4 No. 2 Airplane (USAF No. 46-677)
Longitudinal-stability characteristics of the Northrop X-4 airplane (USAF No. 46-677)
Summary report of results obtained during demonstration tests of the Northrop X-4 airplanes
A flight evaluation of the stability and control of the X-4 swept-wing semitailless airplane
A method for evaluating the loads and controllability aspects of the pitch-up problem