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. |