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Suppose an airplane is flying in windy conditions. Now, for the calculation of the dynamic pressure should I use the relative velocity or the absolute velocity as the free stream airspeed?

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  • $\begingroup$ A wing only cares about he airmass it is moving in. Thus you must take speed of the wing/the aircraft relative to the airmass you are flying in. $\endgroup$
    – Manu H
    Mar 4, 2020 at 12:07

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You should use the speed of the air relative to the object.

Take the extreme example of a stationary wind turbine. It obviously experiences aerodynamic forces and dynamic pressure, yet always has an absolute speed of zero.

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