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It's just a 5 gallon bucket, an old steel veggie can, and a piccolo pete (modified to explode, I assume you know how to do that).
Start out by putting an inch of water in the bottom of the 5 gallon bucket. Take your empty veggie or soup can and put a hole about 1/2 inch wide in the bottom (you want the piccolo to fit through it tightly, with no air leaks). Modify your piccolo and place it through the hole, with the majority of the piccolo in the can, and the fuse + about 1 inch of the pete sticking out the hole. Place the whole assembly in the bucket, with the opened end of the can facing down, and the fuse sticking up (obviously). Light the fuse and RUN.
When we first started, we had launches of 15 to 20 feet. Getting higher than that requires practice and a refinement of technique.
WARNING: Never forget Newton. Blasting a steel can over 200 feet straight up is an awesome sight to behold, but that can obviously has to come back down. I've been hit, and it HURTS. If you do this, never take your eyes off the can while it's in the air. Also, never launch around parked cars, babies in strollers, or anything else that might be irreperably damaged by falling sheetmetal.
WARNING: The typical can may be launched four or five times before it starts to come apart at the seams. Inspect your cans before each launch, and do not try to launch a can that appears to be stretched or seperating. Launching in a 5 gallon bucket ensures that any shrapnel from a disintegrating can goes straight up, but it's still a bit risky. Never try to launch any can you are unsure of.
WARNING: In case of a fizzle, always kick the bucket to knock the launch can over before reaching in, so the water can saturate the piccolo. I once reached into a bucket to pull a "dud", only to have it detonate and launch just as I was reaching in. A moment later and it could have taken off my hand.
POLICE WARNING: In my experience, law enforcement officers don't find this stunt nearly as amusing as my friends and I do. These technically qualify as mortars, and you can be fined for creating them like you would any other type of firework mortar.
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