: a principle used to design aircraft with minimal drag at speeds approaching and in excess of Mach 1
The area rule states that the more closely the progression of the cross-sectional area of an aircraft's body from nose to tail matches the progression of the cross-sectional area of an aerodynamically smooth, idealized shape, the less drag will be generated.
Called the area rule, it says that drag at high speeds is a function of an airplane's total cross-sectional area (essentially, the thickness of the fuselage). Because projections from the fuselage increase a plane's cross section, narrowing the fuselage where the wings and tail assembly attach reduces drag.—Aaron Nicodemus, Telegram and Gazette (Worcester, Massachusetts), 16 Oct. 2009
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