The world's airplane speed record has risen from 30 m.p.h. in 1903 to 440 m.p.h. in 1936. Last week for the first time man knew the point at which this progression must stop. In Manhattan Dr. George William Lewis, research director of the National Advisory Committee for Aeronautics, demonstrated to the Institute of Aeronautical Sciences that the highest speed airplanes can attain with present wing design is 575 m.p.h.
Presenting motion pictures taken in the NACA's new "superspeed" wind tunnel at Langley Field, Va., where airflow up to 750 m.p.h.* is possible, Dr....
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