The value of this design approach was demonstrated in the highly successful North American P-51 fighter of World War II fame the high speed and impressive range were directly attributable to such drag-reducing design features.įirst integer: identifies series (i. These sections were the first to reflect the importance of delaying boundary-layer transition on the airfoil surface. In this airfoil configuration, the mean camber line and the thickness distribution are designed to generate a specific pressure distribution at a certain value of lift coefficient. As described in detail herein, early transition from a smooth laminar flow to a turbulent flow leads to increased drag. Six-digit airfoils were designed in the early 1940s with the objective of encouraging a longer run of laminar-boundary-layer flow along the surface to reduce the skin – friction drag.
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