Mess Mortar

You can achieve similar results using a glass spaghetti tube, hairspray as a propellant and using a gas stove to heat the base. Jeremy Clarkson used to demonstrate these on his chat show.
I've just been banned from firing my pringles tube mortar in the house after I took out a lightbulb... the girlies I live with scream every time it does off and weren't best pleased with me pissing myself laughing as the broken bulb fizzled out.

So now, do I make the combustion space bigger, how big is too big?

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