Bionic wing flaps improve wind energy efficiency

https://techxplore.com/news/2022-03-bionic-wing-energy-efficiency.html

"imitates... words, wings and feathers... feathers on the top of a bird's wings will pop out, creating a natural flap... increase lift and delay the onset of stalling at high angles of attack... simulated the use of the combined flow control accessory in a variety of situations, including high and low angle of attack and pre- and post-stall scenarios. They compared their computational simulations to experimental results for an aircraft wing undergoing a dynamic stall"

Related: Feathered robotic wing paves way for flapping drones

https://techxplore.com/news/2023-01-feathered-robotic-wing-paves-drones.html