Discussion
At what test-section speed does a one-tenth scale model in sea-level air match a full-scale aircraft flying at \( 70 \) m/s?
Answer: A
Matching Reynolds number at the same density and viscosity requires the product of speed and length to be equal, so the model must be run ten times faster, at 700 m/s. That is beyond Mach 2 and would destroy the very similarity being sought, which is exactly why the Reynolds-Mach conflict cannot be escaped by speed alone.
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