Possible Effects of Wing Flexibility on the Aerodynamics of Pteranodon

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Abstract
Wing flexibility in Pteranodon is examined. The theory uses a number of simplifying assumptions restricting the scope of the conclusions that can be drawn. The stability analysis is linear: only small deviations from equilibrium are considered; it is possible that the effects of violent maneuvers may be different. Only 1 aspect of longitudinal stability (although probably the most important) is considered; a complete analysis including the short-period mode and phugoid mode as special cases. Probably the most unrealistic assumption made concerns the tensioning of the wing membrane. It would be interesting to repeat the calculations for spanwise tensioning but this would present a moderately large numerical problem, in contrast to the very simple analysis used here. One would expect the same sort of behavior since essentially the same mechanisms would be operating. It is also assumed that the spar is rigid. Numerical calculations are made for a continuous flexible spar: stability and spar loading relief effects are enhanced; spar bending and twisting are equally effective.

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