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Fig. 5. Lift coefficients of spar-and-membrane profile models, with (pro) and
without a propatagium (no pro), measured in a wind tunnel at a Reynolds number
of 1.2x105, an appropriate value for large pterosaurs
(Wilkinson, 2002). Data
re-plotted from Wilkinson et al.
(Wilkinson et al., 2006).
Measurements were nominally made at angles of attack from –2° to
20°, but below 2° the model without a propatagium luffed so severely
that readings could not be taken. Above 18° the same model stalled, and
again became too unstable for the lift to be measured. For the model with a
propatagium, the best performance was obtained if propatagium deflection (pd),
measured with respect to the chord line of the cheiropatagium, was increased
from 30° to 50° as indicated.
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