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Re: Check out our cannon bot!
My 16 year old does the building, I just buy the goodies.
My favorite is a 2 liter soda bottle with a 1/4 to 5/16 inch (or so) hole in the cap. About a 6 to 7 second spritz of propane from a torch, put the cap back on, put it on some sort of guide rail and light it. WHOOSH. It ignites and the exhaust goes sonic, so watch your ears and don't get burned by the hot exhaust. It'll send a bottle quite aways. You have to squeeze the bottle a few times to purge between firings. The bottles start to deform after several launches.
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Richard Linn
Proud father of Marine LCpl. Karl R. Linn
Co-founder Team 975
KIA, Iraq 1/26/2005
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