The "most valuable single contribution to airplane efficiency since the War" was the epithet that Chairman Joseph Sweetman Ames of the National Advisory Committee for Aeronautics last week placed upon a new form of cowl for radial air-cooled motors. The cowl, shaped like a huge bowl, fits over the cylinders back of the propeller and over the entire motor. It cuts down air resistance; it lets a plane that can go 118 m. p. h. go 137 m. p. h.; it saves in such case about three gallons of gasoline for every hour of...
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