Airspeed is the speed of an aircraft
relative to the air. Among the common conventions for qualifying
airspeed are: indicated airspeed ("IAS"), calibrated airspeed ("CAS"),
true airspeed ("TAS"), equivalent airspeed ("EAS") and density airspeed.
The measurement and indication of airspeed is ordinarily accomplished on board an aircraft by an airspeed indicator ("ASI") connected to a pitot-static system. The pitot-static system comprises one or more pitot probes (or tubes) facing the on-coming air flow to measure pitot pressure (also called stagnation,
total or ram pressure) and one or more static ports to measure the
static pressure in the air flow. These two pressures are compared by the
ASI to give an IAS reading.
Sunday, November 1, 2015
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