** Kline-Fogleman (KFm) Airfoils - Advanced Theory/Science **
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Sep 05, 2011
, 09:15 PM
Build straight - Fly twisty
Australia, QLD, Little Mountain
Joined Feb 2010
Further to this I searched 'vulture in flight' in Google Images.
There is nothing there that looks to me like a stepped wing section.
But Dragonfly wings are another thing altogether: