How can an airplane fly upside down? As long as the front
edge of a wing is tilted far enough above the rear edge, the wing
will produce lift. It doesn't matter which surface of the wing--
top or bottom--is facing "up." Aerobatic airplanes, which are
built to fly upside down, have wings whose upper and lower
surfaces are equally curved. Wings shaped this way make it
easier to fly upside down because they don't need to be tilted as
far to produce enough lift. |

Courtesy of Patty Wagstaff Aircraft Airshows, Inc. |