Estes rockets with cherry bombs glued fuse down on the ejection charge provided tons of fun and honed our skills at timed fuses and calculating flight paths
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We screwed a cap on one end of a short length of 1/2-in. galvanized
pipe. Lighting the fuse of a 2-in. salute, we dropped it into the
open end of the pipe and a marble on top and had a cannon.
We could easily hit the tin roof of a house a block away.
See, Math is fun kids!