Aircraft speed: Difference between revisions

Aircraft speed (view source)

No change in size , 7 October 2011

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 *'''Equivalent''' airspeed (EAS) takes into account another correction (above [[#Calibrated airspeed]], this time having to do with air properties rather than sensor errors.
-At high altitude, the compressibility of air changes, so even CAS becomes more and more unreliable. For the SR-71 Blackbird with a ceiling of 85.000 foot, the CAS becomes very unreliable and the plane has to be flown based on a KEAS. For more conventional aircraft, EAS is not used. Thus, EAS is what a perfect dynamic pressure sensor would show when properly calibrated for the air compressibility at the current altitude.
+At high altitude, the compressibility of air changes, so even CAS becomes more and more unreliable. For the SR-71 Blackbird with a ceiling of 85.000 feet, the CAS becomes very unreliable and the plane has to be flown based on a KEAS. For more conventional aircraft, EAS is not used. Thus, EAS is what a perfect dynamic pressure sensor would show when properly calibrated for the air compressibility at the current altitude.
 === Mach number ===