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Old 3rd Jan 2011, 17:30
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barit1
 
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The B-17 started out as Boeing's model 299, and it used NACA 0018. Its commercial derivative, the 307, likewise.

Also using 0018, Boeing's much larger XB-15, as well as the flying boat 314 which borrowed the XB-15's wing. The XB-15 was probably the earliest of the lot.
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