my 10 year old cousin describes (vaguely) and uses his homemade potato cannon. it is difficult to see the potato after it exits the barrel but with enough fuel (don't overdue it) and a perfectly shaped potato we got it fly about the length of a football field.
It was a lot of fun. just don't stand in front of it. also, it was very cheap to make.
I believe he got the instructions from this website http://www.instructables.com/id/The-Original-Potato-Cannon/
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