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Robot Walks Underwater

Small wonder that scientists want to copy the cockroach, one of the most durable creatures around. 


But Harvard roboticists are now one-upping the insect with Harvard's Ambulatory Microbot (HAMR). 
The new, next-generation HAMR can walk on land, swim on the surface of water, and walk underwater for as long as needed.What gives HAMR its terrain flexibility are the multifunctional feet, made of electrowetting pads (EWP). The focus of electrowetting is reducing the surface tension in a liquid/solid interaction via electricity. That is, an electric charge makes it easier for materials to break a water surface.With its electrowetting pads submerged and activated, the HAMR can move across the surface of the water. With four pairs of asymmetric flaps and custom-built swimming gaits, the HAMR paddles in a manner that's similar to a diving beetle.

HAMR’s size is key to its performance. If it were much bigger, it would be challenging to support the robot with surface tension and if it were much smaller, the robot might not be able to generate enough force to break it,” says Neel Doshi, a Harvard grad student and co-author of the paper describing the new HAMR capabilities.
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