Rotor blades flying thing

Actual airfoil equipped propeller. What is more fun than to play outdoors with your own printed things! Indoor is also possible. The airfoils used is simillar to these: http://m-selig.ae.illinois.edu/ads/coord_database.html
As a bonus a spool with hole in it for the cord, but located at the BOTTOM = non breaking.
Have a look here for other components for the handle: http://www.thingiverse.com/thing:51489

PS: please wear safety goggles, etc. In case it breaks can be dangerous as PLA shrapnel