Classic pop pop/steamjet boat/candle boat with recoil drive. “The rattle, putt-putt or puff-paff boat is a toy boat with water impulse drive (steam jet engine, pulsed waterjet). The simple motor does not require moving parts such as pistons, valves or wheels. The energy source is a candle or other heat source. At the stern of the boat, two pipes stick out side by side and in parallel below the waterline. Water is sucked in through the pipes and expelled again. The characteristic rattling sound of the boat that gives it its name is caused by a special design of the evaporator: The top is made of spring steel sheet as a crackfrog, which jumps back and forth during rapid pressure changes, making a cracking sound in each case.” (Source: Wikipedia) The boat then sails on an unforeseeable route. Size: approx. 14 x 6 x 2.5 cm (L x W x H)