Paper airplanes are a cheap way to make a toy from used materials, such as paper that has already been written on or printed on. You can make paper planes and compete with your friends as to whose plane can glide the longest. You can make a plane that glides the longest by considering the aerodynamics of the design and making certain the folds in the paper for maximum efficiency. The design can be done using a sheet of A4 printer-sized paper or adapted for smaller or larger sheets of paper.
Mark a point on each side of the end of the paper, two inches from the edge. Mark a point on each side of the paper 1/2 inch from the opposite end.
Fold the paper long ways from the outside dot on the end to the outside dot on the other. Repeat this process on the other side.
Fold down the narrow end of the paper about half an inch. Repeat this process for eight folds.
Flip the paper over and fold it in half with the previous folds on the outside of the new fold.
Fold down both wings of the plane so they are parallel to the center fold at about one inch from the edge.
Angle the rear of the wings of the plane up or down to make the plane dive or rise in flight.