William Gurstelle engineer and author of Adventures From The Technology Underground: Catapults, Pulsejets, Rail Guns, Flamethrowers, Tesla Coils, Air Cannons, and the Garage Warriors Who Love Them (Clarkson Potter) says a homemade Calcium Carbite Cannon made with a PVC pipe, powdered calcium carbite and some water makes a big ass bang.
If you like noise, he also recommends making a pulsejet out of an iron pipe which he insists, pound for pound, is the loudest thing in the world.
Maybe you want to freak out your neighbors. In that case, Gurstelle says to make a Dry Cleaner Bag Balloon out of the clear plastic bag you get from the dry cleaner and some flammable Sterno in a small pie pan. He says the balloon looks like a glowing jellyfish and floats up to 50-feet high.
He laughs and says someone is bound to call the cops claiming theyve seen a UFO.
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