Cooperative Quadrocopter Ball Throwing and Catching - IDSC - ETH Zurich

This video was produced by the Institute for Dynamic Systems and Control (IDSC) at ETH Zurich, Switzerland - It shows three quadrocopters cooperatively tossing and catching a ball with the aid of an elastic net.

To toss the ball, the quadrocopters accelerate rapidly outward to stretch the net tight between them and launch the ball up. Notice in the video that the quadrocopters are then pulled forcefully inward by the tension in the elastic net, and must rapidly stabilize in order