Hovering robots could get more lift by 'treading water' in the air
https://www.newscientist.com/article/2333339-hovering-robots-could-get-more-lift-by-treading-water-in-the-air/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
Hovering robots could get more lift by 'treading water' in the air