Pencil-Copter

Turn any ordinary pencil into a helicopter! Just spin it in your hands and liftoff!
Finally, a use for all of those old, eraser-less pencils!
This is seriously fun to play with, trust me.

Glue may be necessary after the pencil gets worn-out a bit.
Use caution, and common sense. The blades will hurt if they hit you!

I designed this propeller with a little bit of extra weight at the blade tips, to increase the moment of inertia. That way it won't slow down so quickly, because it has more kinetic energy to begin with.