Editing Area rule (section)

===Supersonic area rule===
A different area rule, known as the supersonic area rule, developed by NACA aerodynamicist Robert Jones in  "Theory of wing-body drag at supersonic speeds",<ref name="RTJones"/> is applicable at speeds beyond transonic, and in this case, the cross-sectional area requirement is established with relation to the angle of the Mach cone for the design speed.  For example, consider that at Mach 1.3 the angle of the Mach cone generated by the nose of the aircraft will be at an angle μ = arcsin(1/M) = 50.3° (where μ is the angle of the Mach cone, also known as [[Mach angle]], and M is the [[Mach number]]). In this case the "perfect shape" is biased rearward; therefore, aircraft designed for lower wave drag at supersonic speed usually have wings towards the rear.<ref name="RTJones">{{Citation |url = http://naca.central.cranfield.ac.uk/reports/1956/naca-report-1284.pdf | title = Theory of wing-body drag at Supersonic speeds | author-link = Robert Thomas Jones (engineer) | first = Robert T | last = Jones | year = 1956 | place = [[United Kingdom|UK]] | publisher = NACA | type = report | id = 1284 | access-date = 2008-09-12 | archive-date = 2020-12-05 | archive-url = https://web.archive.org/web/20201205131851/http://naca.central.cranfield.ac.uk/reports/1956/naca-report-1284.pdf }}.</ref>