Why we think giant pterosaurs could fly (2018)

This broad flange of bone, situated at the proximal end of the humerus, anchored many muscles running from the shoulder to the wing and powered flapping motions in flight (Bennett 2003), so is a clear correlate for powered flight in giant species. Giant azhdarchid wing bones perform exceptionally well in bending strength tests, being able to resist multiple bodyweights before failing (Witton and Habib 2010), and their expanded diameters maintaining relative failure levels comparable to those of small or mid-sized pterosaurs, despite their size (Witton et al., in prep). Giant azhdarchid wing bones perform exceptionally well in bending strength tests, being able to resist multiple bodyweights before failing (Witton and Habib 2010), and their expanded diameters maintaining relative failure levels comparable to those of small or mid-sized pterosaurs, despite their size (Witton et al., in prep).

Source: markwitton-com.blogspot.com