A study was made to correlate pilots' opinion of the stall warning properties of 16 airplanes with a number of quantitative factors obtained from time history records for speeds near the stall. The results indicate that, in general, the stall warning was considered satisfactory by the pilots when characterized by any of the following qualities: (a) airplane buffeting at speeds from approximately 3 to 15 miles per hour above the stalling speed and of a magnitude to produce incremental indicated values of normal acceleration factor of 0.04 to 0.22, (b) preliminary controllable rolling motion of 0.04 to 0.06 radian per second occurring anywhere within a range from approximately 2 to 12 miles per hour above the stalling speed, and (c) rearward travel of the control stick of at least 2.75 inches during the 15-mile—per-hour speed range immediately preceding the stall. The magnitude of the rolling velocity in the complete stall influenced the degree of buffet and stick movement required for satisfactory warning.
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