The Douglas DC-3, which first flew in 1935, had a wing with a slightly swept leading edge (and a straight trailing edge). The idea was always more theoretical than practical. Real airplanes would ...

The upperside feathers often feature wing bars that make birds easier to identify. And a small, separate group of feathers on the leading edge of the wing, the alula, is similar to a human’s thumb.

A wing model was constructed to conduct aerodynamic ... pigeons during the takeoff stage cause the leading-edge vortex to attach earlier, enhancing instantaneous lift to overcome gravity and ...

So the wing on the truck is basically the wing that in a year or so will go on the flight test aircraft. The leading edge of the current 31-foot carbon-fiber wing is festooned with 18 small ...

The wings, for example, are shaped to create lift. The leading edge is thicker than the back edge, and they are covered in feathers that narrow to a point. Airplane wings are modeled after bird wings.

Prominent black crescent framing lower edge of auricular. On perched bird, wing patch shows only as a thin white line along the leading edge of the folded wing. Adult male: grayish or grayish ...