Once when I was a kid I got a Big Bang cannon for Christmas.
I loved it, and would sit on the back porch for hours firing it. Once the “Bangsite” fuel ran out, there was no more to be had. Now I understand why.
I discovered that if you didn’t clear out the fumes after firing, you got a nice puff of flame when you fired it again and very little noise.
I also, in collaboration with my brother, made rockets by filling tin cans with matcheads as fuel. They always blew up before going to far.
My brother and I made rockets from rolled up and glued note cards, fueled with potassium nitrate and powdered sugar. Those puppies made it to the next neighborhood a mile away.
The black powder versions had mixed reviews.
Great tip!