Details: While mulling over the thought of trying to put together a boat for a LEGO boat race (an increasingly popular challenge at Adult Fan of LEGO gatherings), it occurred to me that using the off-the-shelf remote controls wouldn't be terribly effective due to light distortion near the water's surface. The obvious solution is to use bluetooth instead, and devise some sort of remote control to steer the boat. Here's a spectacular implementation of that idea. Two small propellers steer the boat, and the motors are safely on board the boat (which is the only way I'd recommend trying to build something like this, although I understand some builders have had luck with risking their motors and other electronic parts touching the water). This design actually changes the angle of both propellers to steer - a nice trick I wouldn't have thought of.
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