correctairspeed

Calculate equivalent airspeed (EAS), calibrated airspeed (CAS), or true airspeed (TAS) from one of other two airspeeds

Syntax

outputAirpseed = correctairspeed(inputAirspeed, speedOfSound, pressure0, inputAirspeedType, outputAirspeedType)

Description

outputAirpseed = correctairspeed(inputAirspeed, speedOfSound, pressure0, inputAirspeedType, outputAirspeedType) computes the conversion factor from specified input airspeed to specified output airspeed using speed of sound and static pressure. The function applies the conversion factor to the input airspeed to produce the output in the desired airspeed.

This function is based on an assumption of compressible, isentropic (subsonic flow), dry air with constant specific heat ratio (gamma).

Input Arguments

inputAirspeed

Floating-point array of size m-by-1 of airspeeds in meters per second. All values must have the same airspeed conversions from inputAirspeedType to outputAirspeedType.

speedOfSound

Floating-point array of size m-by-1 of speeds of sound, in meters per second.

pressure0

Floating-point array of size m-by-1 of static air pressures, in pascal.

inputAirspeedType

Input airspeed string. Supported airspeed strings are:

'TAS'True airspeed
'CAS'Calibrated airspeed
'EAS'Equivalent airspeed

outputAirspeedType

Output airspeed string. Supported airspeed strings are:

'TAS'True airspeed
'CAS'Calibrated airspeed
'EAS'Equivalent airspeed

Output Arguments

outputAirpseed

Floating-point array of size m-by-1 of airspeeds in meters per second.

Examples

Convert three airspeeds from true airspeed to equivalent airspeed at 1000 ms:

as = correctairspeed([25.7222; 10.2889; 3.0867], 336.4, 89874.6,'TAS','EAS')

as =

   24.5057
    9.8023
    2.9407

Convert airspeeds from true airspeed to equivalent airspeed at 1000 m and 0 m:

ain = [25.7222; 10.2889; 3.0867];
sos = [336.4; 340.3; 340.3];
P0 = [89874.6; 101325; 101325];
as = correctairspeed(ain, sos, P0,'TAS','EAS')

as =

   24.5057
   10.2887
    3.0866

References

Lowry, J.T., Performance of Light Aircraft, AIAA Education Series, Washington, D.C., 1999

Aeronautical Vestpocket Handbook, United Technologies Pratt & Whitney, August1986

See Also

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