My son (a 5th grader at the time) did a 4-H project on lift and Bernoulli's
Principle using paper airplanes...he placed 1st in the region! Now that I've
had a chance to brag, I can also tell you that you can tie in a science
lesson (aerodynamics, etc.) using paper airplanes. Nelson also used a
balloon to demonstrate how rockets fly...the lift from escaping gases/the air
rushing from the balloon. Does that help?
There is another wonderful book that has different shapes of
planes...including the Vortex, which is a 3" cylindrical shape that flies
beautifully! I think it's The World's Best Paper Airplanes, or 10 Best,
something like that...I'll ask Nelson when he returns from school.