If you’ve flown a quadcopter, you’ll know what happens when a propeller stops or fails: the thing flips around and crashes. Using a new system from Mark W. Mueller, Simon Berger, and Raffaello D’Andrea at ETH Zurich, however, quadcopters can automatically right themselves after motor failure and even can even allow a human operator to control the drone until it is safely on the ground.
When a motor or propeller fails, the fail-safe routine keeps the drone more or less upright. LEDs on the arms show the user a “virtual yaw angle” so they can handle the robot as it flies but eventually the team will add a magnetometer to handle this automatically. The team writes:
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