Slingshot Helicopter / Flying Arrow

I created this thing as a printable copy like the LED-Helicopter (http://www.ledhelicopters.com/)!
You need 2 extra parts: a rubberband and 2cm of filament (1.75mm), which you must stick in the smale whole!
The wings should you print on a printable plastic sheet (dont use the option "fit to page")! Cut the wholes out and fold it (green and blue lines) like you can see it in the picture!