A robot fish developed at the U.K.'s University of Bath features a unique method of propulsion--a single fin rippling along its belly like a wave. Bath engineers say Gymnobot might inspire lighter, more efficient robotic submersibles.
Recent robot fish, such as MIT's low-cost polymer fish, have flexible bodies, but Gymnobot is rigid save for a long undulating fin powered by twin crankshafts inside its body.
The design is a nod to freshwater knifefish, which can move forward and backward, and hover, by rippling an elongated ventral fin. The skin of the fin covers hundreds of fin rays … Read more