Like death and taxes, drone crashes are basically inevitable. Even experienced pilots arenât immune to hardware failures or software problems. But instead of building drones stronger, or wrapping them in awkward safety cages, Swiss researchers have designed a flexible quadcopter that squishes when it crashes, minimizing the damage it takes.
Itâs another design innovation that Mother Nature already came up with eons ago. Flying insects crash into things all the time, but their bodies are designed to be flexible and absorb most of the impact, without causing any permanent damage. Most drones, however, are made from lightweight plastic or carbon fiber that helps them fly, but is easily broken after a rough landing, leaving them grounded.
Researchers at Switzerlandâs Ăcole Polytechnique FĂŠdĂŠrale de Lausanneâor EPFL, for shortâhave long been stealing ideas from nature and built an insect-inspired quadcopter that crumples up during a crash only to pop back to its original form once itâs come to rest.
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It turns out that wasps have a unique flexible joint in their wings that allows them to remain rigid during flight, but also crumple in the opposite direction in the event of a collision. This design ensures that if a waspâs wing hits something while itâs flapping away, it wonât catastrophically tear the thin membrane, leaving the insect unable to fly.

But quadcopters donât have wings, and their propellers are cheap and easy to swap out when broken. Itâs the rest of the craft that usually sustains the expensive damage. So the EPFL researchers designed a new type of drone fuselage with a flexible elastic frame that attaches to a central rigid core using a series of magnets. When the drone crashes into something, the force of the impact causes its central core to separate from the outer frame, which then squishes and compresses to absorb the energy of the impact.
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Once itâs done flopping around, everything pops back into place thanks to the magnets and (assuming it lands right side up) the drone is immediately ready to take to the skies again. But the design isnât just applicable to drones. Other robots are just as prone to crashing and falling, often resulting in expensive repairs. So by engineering them with a strategic mix of rigid and flexible components, they could also better survive inevitable accidents.
When you think about it, your own body, a skeleton covered in flexible tissue, is essentially the same thing.
[Ăcole Polytechnique FĂŠdĂŠrale de Lausanne via IEEE Spectrum]
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