
FlexiQuad: the collision-resistant ring drone from ETH Zurich
Robotics researchers at ETH Zurich have designed a quadcopter without a rigid central body that absorbs collisions without crashing. Invented by Luca Girardi and Stefano Mintchev, the ring-shaped FlexiQuad drone uses an elastic frame that flexes laterally on impact while retaining the vertical stiffness required for flight. The inventors have filed a patent application for the device, which has also earned a nomination for the university's Spark Award.

