Aerones, a Latvian startup, designed a giant industrial cleaning drone. Cleaning wind turbines and grain storage drums is often done by helicopters, but it's expensive. This drone does it for a lot less money. Aerones is still in its incubator phase (it's backed by Y combinator), so the company's drone has yet to reach the commercial market.
Read more: http://robotics.sciencemag.org/content/3/16/eaar3449
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