R calls and useful sizes
Aerospace propulsion

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R calls and useful sizes
Aerospace propulsion

Author : Marc BOUCHEZ

Publication date: February 10, 2010 | Lire en français

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1. R calls and useful sizes

1.1 Speed-related quantities

  • The Mach number of an aircraft, for example, is defined by the ratio between the speed of the aircraft and the speed of sound (local) in the surrounding environment:

    M= Vitesse de l'avion  Vitesse locale du son ( 1 )

    The Mach number (introduced in 1877 by the physicist of the same name, see

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