![]() Natural organisms, such as cheetahs, rabbits, or cockroaches, use high-speed locomotion as one of their main survival strategies to hunt for food or flee from predators. Moreover, prototype untethered versions run and swim at a maximum speed of 2.1 BL/s and 1.8 BL/s, respectively. Their tethered versions reach ultra-high running speeds of 70 BL/s (body lengths per second) on 3D-corrugated substrates and 35 BL/s on arbitrary planar substrates while their maximum swimming speed is 4.8 BL/s in water. These robust and versatile robots can walk, run, swim, jump, steer and transport cargo. Their dynamic resonant performance is investigated experimentally and theoretically. Here, we present a class of small-scale soft electromagnetic robots made of curved elastomeric bilayers, driven by Lorentz forces acting on embedded printed liquid metal channels carrying alternating currents with driving voltages of several volts in a static magnetic field. Bio-inspired soft robots equally benefit from versatile and ultrafast motion but require appropriate driving mechanisms and device designs. ![]() High-speed locomotion is an essential survival strategy for animals, allowing populating harsh and unpredictable environments. ![]()
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