Equivalent airspeed (in function of Mach number)


Equivalent airspeed (EAS) is the airspeed at sea level in the International Standard Atmosphere at which the dynamic pressure is the same as the dynamic pressure at the true airspeed (TAS) and altitude at which the aircraft is flying. In low-speed flight, it is the speed which would be shown by an airspeed indicator with zero error. It is useful for predicting aircraft handling, aerodynamic loads, stalling etc.

It can be calculated as a function of Mach number.

Related formulas


EASequivalent airspeed (m/s)
a0standard speed of sound at 15 °C (661.47 knots) (m/s)
Maircraft Mach number (dimensionless)
Pstatic pressure (Pa)
P0standard sea level pressure (1013.25 hPa) (Pa)