How do you make a pinewood derby car that's powered by a C02 cartridge

Question

if you dont know a pine wood derby car is a small car one makes out of wood and puts on a slanted track next to another car and races with the force of gravity being its main power source. However I thought it would be awesome to strap a c02 cartridge on there. I know others have done...but I'm having trouble making a triggering device...(I dont want to just put a hole in the cartridge and strap it on the car) please help if you can! oh and this isn't an official pine wood derby so I'm not breaking any rules!

Answer 1

Check out this example.

http://www.et.byu.edu/~wheeler/benchtop/...

http://www.science-of-speed.com/science....

http://sketchup.google.com/3dwarehouse/d...