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Drones with large installed power, capable of impressive stunts, but a narrow aperture may be for the apparatus an insurmountable obstacle. A team of researchers from the University of California at Berkeley attempted to solve this problem by developing "passively evolving quadcopter" that can temporarily emerge to fly a bottleneck.
"Passive" in the description refers to the folding mechanism without any actuators and power source. Drone saves the unfolded state in the presence of the thrust of the engines. Should the screws to stop the rotation as the spring fold design, making it more compact. If you correctly calculate the trajectory, you can fly through the obstacle with a narrow opening, as shown in the video posted by the developers.
of Course, the obstacle must be large enough so that the drone could again go to the active flight and gain altitude.
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