28.04.2010 11:21 Uhr, Quelle: Engadget

NASA's robot submarine achieves perpetual motion, of a sort

The Sounding Oceanographic Lagrangrian Observer Thermal Recharging (SOLO-TREC) autonomous underwater vehicle is, well, quite a mouthful. It's also the first submarine that can run a sizable percentage of forever without requiring a charge. When the 183-pound buoy dives, cooler water temperature causes a liquid wax-like substance inside to solidify, squeezing out oil that drives a hydraulic generator; when it surfaces, the wax softens once again, ready for another round. Every dive produces 1.7 watt-hours of electricity, enough to power all the instruments, GPS and buoyancy-control pump on board. It's like a drinking bird that never runs out of water. Desig

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