Hovering robots could get more lift by 'treading water' in the air

Moving like an insect may not be the most efficient way for tiny flying robots to hover – they get more lift by taking advantage of vortices of air that form under their wings

Hovering robots could get more lift by 'treading water' in the air
Moving like an insect may not be the most efficient way for tiny flying robots to hover – they get more lift by taking advantage of vortices of air that form under their wings