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08-23-2010 | 07:50 PM

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HO-229

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From: California, MD

NACA numbers?

Hughes H-4 Hercules utilizes the following NACA airfoils
NACA 63(420)-321 and NACA 65(420)-415

What NACA series airfoil are these and what do the numbers in parentheses & dash number identify/mean?
Examples: NACA 4 digit
NACA 6 digit

Thanks in advance,
Dave

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