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based on the Prandtl factor
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Depending on what your doing with the Prandtl-Glauert correction, you can vary velocity for example as much as ~75 mph TAS over
measured results or even more depending on the design specifics.
The basic correction agreement between calculated and wind tunnel data for a tailess DC-9 for example shows the Prandtl-Glauert correction to be some 66 mph TAS pessimestic over
measured results.