SP-4305 ENGINEER IN CHARGE

Historical evolution of airfoil sections, 1908-1944.

The historical evolution of airfoil sections, 1908 1944. The last two shapes (N.A.C.A. 661 -212 and N.A.C.A. 74 7A315) are low-drag sections designed to have laminar flow over 60 to 70 percent of chord on both the upper and the lower surface. Note that the laminar flow sections are thickest near the center of their chords.

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