....or this other video that shows a perfect synchronized flight indoor:
Now it appears that the next level have been reached with this video that shows two quadrocopters capable of not only balancing an inverted pendulum,
but also of launching it off the vehicle and catching it again:
I also like this one where three quadrocopters are playing with a ball and an elastic net:
This video 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 to avoid a collision. Once
recovered, the quadrotors cooperatively position the net below the ball in order to catch it.
Because they are coupled to each other by the net, the quadrocopters experience complex forces that push the vehicles to the limits of their dynamic
capabilities. To exploit the full potential of the vehicles under these circumstances requires several novel algorithms, including:
1) an optimality-based real-time trajectory generation algorithm for the catching maneuver;
2) a time-varying trajectory following control strategy to manage the forces on the individual vehicles that are induced by the net; and
3) learning algorithms that compensate for model inaccuracies when aiming the ball.
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