559 THE TORSIONAL STRENGTH OF WINGS the spars may be calculated from the internal work under a given load, on the principle that the rigidity is inversely proportional to the work. This follows directly from the well-known fact that with a given load, the work is proportional to the deflection,… … Figure 4.—Drag truss In XHB wing The moment of inertia of the cross section, or the reciprocal of the internal work under a given load may be taken as rigidity factors of the spars. The sum of the moments of the rigidity factors about the leading edge of the wing, divided by the sum of these…
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