Palmer and Dyke (2011) analyze the flight dynamics of pterosaurs (http://rspb.royalsocietypublishing.org/content/early/2011/09/22/rspb.2011.1529.abstract).
According to Palmer and Dyke, pterosaurs would not have been capable of powered flight if previous reconstructions are accurate. The author's suggest new configurations of the wing membrane that would have enabled powered flight in giant pterosaurs such as Quetzalcoatlus.
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