Fold the ends of the tail up. Tape the tail on the opposite end of the tube from the wing, making sure that the inside tube is free to move. Try to fly the airplane. Compare its shape with other students. Have students continue making adjustments until all their airplanes fly.
Gravity tends to pull an airplane to the earth when it is in flight.
In order for an airplane to become airborne and to stay in the air, it must create a lifting force greater than the pull of gravity. Lift is created by a change of air pressure around the airplane's wing. When an airplane is on the ground, the air pressure above and below the wing is the same. As the airplane begins move, the pressure changes. The faster it goes, the greater the lift beneath its wings.