Question

Determine the value of tail angle of attack if, elevator floats down by 1.8 degree. Consider CHδe as 0.003 and CHɑt as -0.006.

(a) 0.9

(b) 2.5

(c) 3.4

(d) 1.8

The question was posed to me by my college professor while I was bunking the class.

The question is from Stick-Free Stability in portion Stability, Control, and Handling Qualities of Aircraft Design

Answer 1

The correct choice is (a) 0.9

To explain I would say: Given, elevator float e = 1.8°. CHδe = 0.003, CHɑt=-0.006.

Now, tail angle of attack = – e* CHδe / CHɑt = -1.8*0.003/-0.006 = 0.9°.