Swiss researchers built tiny drones powered by sound, using 40 kHz ultrasound and 3D-printed resonators to generate thrust

Engineers from Switzerland have innovated remarkable microfliers and miniature boats that harness sound waves for propulsion. Using Helmholtz resonance, these devices can propel themselves without mechanical parts. The tiny vessels are capable of agile maneuvers by adjusting sound frequencies, while microfliers, weighing just micrograms, can achieve flight through ultrasonic vibrations. This breakthrough technology presents a pioneering approach to propulsion for tiny machines.
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