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Winged drones that fly in close proximity to obstacles or that are capable of aerial and terrestrial locomotion can benefit from protective systems that prevent damage to delicate aerial structures. Existing protective solutions focus on multi-copter drones and consist of adding structures, such as cages, mechanisms and instruments that add weight and drag. Here we describe a protective strategy for winged drones that mitigates the added weight and drag by means of increased lift generation and stall delay at high angles of attack. The proposed structure is inspired by the wing system found in beetles and consists of adding an additional set of retractable wings, named elytra, which can rapidly encapsulate the main folding wings when protection is needed.
Pedro Miguel Nunes Pereira de Almeida Reis, Claudio Boni