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If CM0 is -0.052 and lift coefficient at zero angle CL0 is 0.92 then, find CMac. Consider rectangular wing.(a) -0.282(b) 0.98(c) 2.5(d) 7.89The question was posed to me during an online interview.My doubt stems from Longitudinal Static Stability and Control-2 topic in portion Stability, Control, and Handling Qualities of Aircraft Design

Answer»

Correct CHOICE is (a) -0.282

The EXPLANATION: CMac = CM0 +CL0*[Xcg-Xac]

For a typical RECTANGLE wing, Xcg-Xac =0.25.

Hence, CMac = CM0 + CL0*0.25 = -0.052+0.95*0.25 = -0.282.



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