[Ref PPL Instruction Kit Vol1 (306) – 9th Edition, V9.2 P.3]
Relative Airflow (RAF) is defined as the speed AND direction of the air movement past an aerofoil – equal in size and parallel but opposite in direction to the flight path.
Relative airflow (RAF) = Free Stream Flow
– RAF due movement of acft.RAF has 3 qualities:
It flows in a direction parallel and opposite to the direction of flight path
(NOTE: flight path is no need to be heading)
Also, air in a region where pressure, temperature and relative velocity are unaffected by the passage of the acft through it.
the magnitude of RAF is TAS
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