Discussion
Arrange these aerofoil families in the order they were developed:
1. NACA four-digit series
2. NACA five-digit series
3. NACA six-series laminar flow sections
4. Supercritical sections
Select the correct sequence.
Answer: C
The four-digit series of the 1930s was followed by the five-digit, then the six-series laminar-flow sections of the 1940s, and finally the supercritical sections of the late 1960s. Each answered a limitation of its predecessor.
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