This weekend we decided to make our own pop-pop or putt-putt boats like the one in the movie Ponyo. We followed the directions from Science Toy Maker: http://www.sciencetoymaker.org/boat/
It took a couple hour-long sessions to make the pop-can flash engines. Luckily all four engines worked on the first try. Some were obviously more powerful than others. We also learned that the smaller, lighter boats go faster. The foam used for the hull is rigid extruded polystyrene made by Dow that we picked up form Lowe's. Thick, but stable enough to hold the boilers without additional weights.
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