e front and rear spars, but are in tension as members of the top and bottom drag trusses; and conversely for members C and E. By proper proportioning of the members, these tensile and compressive forces in the longitudinals can be made to cancel each other, with the result that the torsion is… … Figtoi S.—Spar trussing In XHB wing THE ELASTIC AXIS OR CENTROID. The elastic axis or centroid of the wing is the line across which a transverse force may be applied without causing any rotation of the wing sections. In structural analysis of a wing having more than two spars, or drag bracing…
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