pop bottle launcher

My launcher has only 6 parts and some epoxy.

pvc

O-rings

pvc

coupler

pop bottle top

cable ties

valve stem (from any tire)

I was in a hurry to make it and I did some surfing to sites like these:

http://www.osa.com.au/~cjh/rockets/
http://www.scioly.org/eventpages/bottlerockets.htm
They gave me the basic idea and I whipped it together in under an hour. It shoots 1 liter bottles almost a hundred feet, and at this time I haven't yet shot a 2 liter. Very groovy.

DISCLAIMER: If you make one of these, you are accepting the responsibility for your creation.
I hold this launcher in my hand (which some might frown upon) and I still have both eyes and all my fingers, but if you make one, you would be wise to consider a remote launcher of some type.