Torsional Rigidity of Cantilever Wings

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Torsional Rigidity of Cantilever Wings

Beam Deflection and Stress Calculators Formulas & Structural Analysis

Torsional Rigidity of Cantilever Wings with Constant Spar and Rib Sections
Giuseppe Gabrielli, Lufthahrtforshung
National Advisory Committee for Aeronautics
June 26, 1928

During recent years several very thorough and interesting treatises have been devoted to the investigation of systems of spas and ribs stress, especially for the static's of cantilever wings. From them we have obtained a clearer idea of the effect of the ribs and have also been enabled, in a few special cases, to calculate, by relatively simple methods, the magnitude of the principal effect of the union of the spars and ribs, namely, the reduction of the bending moment at the fixed ends of the spars.

The present paper treats less of the effect of the union than of its influence on the torsional rigidity of the wing. The calculations are carried out for a two-spar wing of constant cross section, in which the ribs are replaced by a continuous member of constant rigidity (assumption of an infinite number of ribs) to be very great in comparison with their torsional.

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