True Airspeed - High-speed flight
The true airspeed (TAS; also KTAS, for knots true airspeed) of an aircraft is the speed of the aircraft relative to the airmass in which it is flying. The true airspeed is important information for accurate navigation of an aircraft.
TAS can be calculated as a function of Mach number and static air temperature as shown.Related formulas
|true airspeed (m/s)
|speed of sound at standard sea level (661.47 knots) (m/s)
|Mach number (dimensionless)
|static air temperature in kelvin (K)
|temperature at standard sea level (288.15 K) (K)