This easy build uses two important scientific principles, buoyancy and stored kinetic energy, to float and drive a simple boat. The parts are all readily available around most homes, and the boat can be assembled in minutes, though a bit more time with waterproof markers can add some style to the outcome. Consider experimenting with additional components like fins for stabilization, to improve the performance.
Projects from Make: Magazine
Two Liter Soda Bottle Boat
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Steps
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Step #1: Attach the Sticks
Using the tape, attach the sticks or dowels on opposite sides of the soda bottle (empty, but with cap secured) so that they overlap the bottle by about 1/3 its length, and then extend 6" - 8" from the bottom.