Any explanation of what the advantages are to having so many rotors? Based on a recently-linked article [1], it seems like you'd take a big efficiency hit. [1

Any explanation of what the advantages are to having so many rotors? Based on a recently-linked article [1], it seems like you'd take a big efficiency hit. [1] https://news.ycombinator.com/item?id=6730309 https://news.ycombinator.com/item?id=6730309