My Uncle in the 1970s taught me how to make a cannon that went boom with just tin cans, electrical tape and Rossignol fluid, taped together and holes in the first few cans. Made a very loud boom. How was this made?
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We used to make those too. We called them tennis ball canons. You pretty much described the whole thing. Make a big tube from a bunch of cans taped together and put a hole in the bottom one. Squirt lighter fluid into the hole, put your tennis ball in the other side, and light the lighter fluid through the hole.
Check out aerosol spud launchers, that might give you some ideas.