Drones are already being used for search and rescue missions. Not all of them can fly through narrow holes though. University of Zurich and EPFL researchers have come up with a drone that changes shape to be able to fly through narrow holes. It consists of a frame with 4 rotating arms that fold around it.
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The drone retracts its propeller arms and makes itself small to fit through narrow spaces. Once the drone passes through the gaps, it goes back to its previous shape.
[HT]
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