I made a pulse pot jet engine once. You need a metal can a bit taller than as its width. Drill a one centimetre hole in the centre of either end of the can. Remove the food contents of the can; obviously you need a food type that is easy to remove. Then pour some methylated spirit into the hole so that there is about a centimetre of depth of methylated spirit. Dim the lights. Hold your thumb over the hole and give the can a good shake to generate some vapour. Then hold a match or lighter near the hole to start the engine. You should see a pulsating jet of flame and hear a pulsating noise as your pulse pot jet engine roars. The German V-1 flying bomb, also known as the Buzz Bomb or Doodlebug, was an early pulse-jet-powered predecessor of the cruise missile. The following clip shows the pulse pot jet engine in action. This is how I made my first one and it blew up like this one too.