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The hind wing pair is the lower pair in this sketch.
This and the next 2 images are from:
Herbert, R.C. (1), Young, P.G. (2), Smith, C.W. (2), Wootton, R.J. (1), Evans, K.E. (2),
(1) School of Biological Sciences, University of Exeter, Hatherly Laboratories, Prince of Wales Road, Exeter EX4 4PS, UK
(2) School of Engineering and Computer Science, University of Exeter, Exeter EX4 4QF, UK
“The hind wing of the desert locust (Schistocerca gregaria Forskal), III. A finite element analysis of a deployable structure”, J. Exp. Biol. 203, 2945–2955 (2000)
ABSTRACT: Finite element analysis is used to model the automatic cambering of the locust hind wing during promotion: the umbrella effect. It was found that the model required a high degree of sophistication before replicating the deformations found in vivo. The model has been validated using experimental data and the deformations recorded both in vivo and ex vivo. It predicts that even slight modifications to the geometrical description used can lead to significant changes in the deformations observed in the anal fan. The model agrees with experimental data and produces deformations very close to those seen in free-flying locusts. The validated model may be used to investigate the varying geometries found in orthopteran anal fans and the stresses found throughout the wing when loaded
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