Bull roarer

The bullroarer is an ancient method of signalling used by many people, often in tribal ceremonials. It consists of a piece of wood that is carved into an aerodynamic wing shape at least 30 cm long attached to a string that is spun over the head to create a buzzing noise. They are easy to make and decorate with your most interesting designs.

Supplies you need:
Connecting string should be 1200 mm long.

Now go and spin it over your head.

You can also read more about making bullroarers here:
http://sctritonscience.com/Wilson/physics/worksheets/practical%20physics…

And take a look of some of the examples here:
http://www.youtube.com/watch?v=Ozr4pRy0sU4
http://www.youtube.com/watch?v=zcvpJoNukq8