Boomerang
Dangerously fun shows you how to make a boomerang from a sheet of plywood… – “Yes, it really is possible to make a boomerang that comes back when you throw it. Each side of a boomerang has an airfoil shape. These airfoils face opposite directions so the correct edge is always leading while the boomerang is spinning. This is what gives boomerangs lift. A gyroscopic effect causes them to curve in a circular path and return to their origin.

The plywood you choose should have several plys and be around 1/4 inch thick. Birch is an excellent choice because it is light and strong, but others will work also. You can either draw your own boomerang shape or use the link at right to download a .pdf with two premade patterns.” Thanks Dan! – Link.