• A pop-pop engine is a water pulse jet. The space between two metal plates (the boiler) is filled such that both air and water are present. Two metal pipes full of water lead from below the boiler to the back of the boat below the water-line. The rigid bottom plate is heated by a flame and when the water reaches its boiling point, it starts to turn into steam. The upper plate is flexible. 
  • Elaborate if you found more information regarding the main theory or concept
  • Include any relevant pictures, video clips or links 

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