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A 2D airfoil is operating at 0.6M. Find the approximate value of lift curve slope in per rad.(a) 7.85(b) 1.9(c) 2.3(d) 3.87I got this question during an internship interview.This interesting question is from Aerodynamics in portion Aerodynamics of Aircraft Design

Answer» CORRECT option is (a) 7.85

Easiest explanation: Given, MACH number M = 0.6

2D LIFT curve slope = 2*π / (1-M^2)^0.5

= 2*π / (1-0.6^2)^0.5 = 7.85 per RAD.


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