Discussion
The USAF DATCOM method estimates derivatives from
Answer: B
DATCOM is a handbook of empirical charts and correlations keyed to geometric parameters, built from decades of tunnel and flight data, and it remains the quickest route to a first derivative set at the preliminary design stage. It solves no equations, so the second option describes computational fluid dynamics instead. It is built from measurements but is not itself a measurement method. And no exact potential-flow solution exists for a general configuration.
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