The Whitcomb area rule, also called the transonic area rule, is a design technique used to reduce an aircraft`s drag at transonic and supersonic speeds, particularly between Mach 0.75 and 1.2. This is one of the most important operating speed ranges for commercial and military fixed-wing aircraft today, with transonic acceleration being considere....
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http://en.wikipedia.org/wiki/Area_rule
These photos show the narrowing of the YF-102A fuselage near the wings as dictated by the area rule compared to the fuselage of the YF-102. It enabled the aircraft to become supersonic. Credit: NASA A rule in aircraft design discovered by NASA aerodynamicist Richard Whitcomb in 1950. It states ...
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http://www.daviddarling.info/encyclopedia/A/area_rule.html
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