The wing of Example 29.1 is required to have a minimum divergence speed of 350 m/s. If the torsional stiffness of the wing is to remain unchanged, calculate the required movement aft of the aerodynamic center.

Answer: 0.51 m.

Question

The wing of Example 29.1 is required to have a minimum divergence speed of 350 m/s. If the torsional stiffness of the wing is to remain unchanged, calculate the required movement aft of the aerodynamic center.

Answer: 0.51 m.

Accepted Answer

From Eq. (29.3),

[latex]V_{d}={\sqrt{\frac{2K}{\sqrt{ ho S e c{\bigl(}\partial C_{L}/\partial\alpha }\bigr)}}}[/latex] (29.3)

[latex]e c=1.93 imes10^{6}/\left[(1/2) imes1.226 imes350^{2} imes30 imes3.5 ight]=0.24{\mathrm{m}}[/latex]

In Example 29.1, [latex]e c=0.25 imes3.0=0.75\ \mathrm{m}.[/latex] Therefore the required movement of the aerodynamic center is [latex]0.75-0.24=0.51\ \mathrm{m}.[/latex]

Question 29.1: The wing of Example 29.1 is required to have a minimum diver......

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