Watch This Flying Ring Propel Itself Around the 'Flying Machine Arena'

That ring flying in circles around the room looks like it has a life of its own. It’s going at 1.4 meters per second, and engineered from a quadrotor (also known as a quadcopter or quadrotor helicopter), a helicopter propelled by four rotors.In this video by Rajan Gill from the Institute for Dynamic Systems and Control, ETH Zurich, he explains that while quadrotors are agile and have high load carrying capabilities, they’re not very efficient in forward flight. Their lift to drag ratios are comparable to that of a fruit fly, he says

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