How to make a Paper Airplane

Things you'll need:  

Paper (copier or computer printer paper works best), some 1/2" or 3/4" cellophane tape, and a paper clip.

(you can make several and experiment with different ways of making it fly)

Procedure 

Build a special paper airplane to demonstrate how airplane wings work and how most birds can fly (when they're not flapping their wings). 

See and print the airplane. 

Cut out the airplane's shape along the dark solid line. Next, fold the top half at the dotted line so that it meets the bottom half. Don't, however, fully crease the paper at the fold (we want to make a nice 'tear drop' air foil shape). After folding the paper back, put a small piece of tape at the wing tips and at the center at the points marked A, B, and C. Now fold the plane along the center crease so that it creates a flattened out 'V'. The angle of the 'V' should be no more than about 15 degrees. 

Test fly the plane and adjust its stability. Keep the nose of the plane from rising (stalling) by adding a small weight to the nose (point D), a paper clip or two does nicely. You can also adjust how much the plane dives or climbs by cutting small slots in the tail of the plane and bending the paper at the cuts up or down. Experiment with putting them up or down and seeing what effect that has on the way the plane flies. People who know about airplanes call these little 'tabs' an elevator if it makes the plane go up or down and a rudder if it makes the plane turn right or left.