Discussion
At sea level, where the speed of sound is about \( 340 \) m/s, the speed corresponding to the conventional compressibility threshold of \( M = 0.3 \) is nearest to
Answer: D
Multiplying, \( 0.3 \times 340 = 102 \) m/s, or about 200 knots. Below this speed the density varies by less than five per cent through the flow field and an incompressible analysis is adequate, which covers most light aircraft and all low-speed wind-tunnel work.
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