Equivalent Airspeed (EAS) in flight mechanics refers to the calibrated airspeed corrected for compressibility effects. It represents the airspeed at sea level that would result in the same dynamic pressure as the true airspeed at a given altitude. EAS is a valuable parameter for aircraft performance calculations and flight testing, allowing for a more accurate assessment of aerodynamic behavior across different altitudes and airspeeds. The formula to calculate EAS as follows:
Where:
- is the Equivalent Airspeed.
- is the speed of sound at sea level in m/s.
- is the Mach number.
- is the static pressure at altitude in Pa.
- is the standard static pressure at sea level in Pa.