1950s style steam powered Putt Putt boat - I discovered this after watching the anime movie "Ponyo". This toy is great! Why dont kids play with educational toys like this anymore?! How it works is simple. You prime the little pipes with water. The candle heats the vessel which is connected to the pipes. Steam rushes out the pipes and propels the boat forward. Cold water gets intermittently sucked into the vessel via the pipes and the vessel constantly expands and contracts, hence the putt putt sound.
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