Airfoil.

摘要

An airfoil 10 to operate at Mach numbers between approximately .2 and 1.0 is designed to achieve high lift capability at low speed and also to minimize drag at high forward speeds. The leading edge region 30 of the airfoil has a relatively large radius of curvature 20 with a slightly drooped configuration to provide high lift at a low Mach number. The curvature of the upper surface 40 aft of the leading edge region and throughout the middle section of the airfoil 10 is relatively low to delay the onset of shock wave drag at moderate lift coefficients at transonic Mach numbers. The lower surface 50 of the airfoil 10 is shaped to provide a nearly uniform load distribution along the chord throughout the middle section at moderate lift coefficients to delay drag increases at transonic Mach numbers.