Dynamic morphing Airfoil - gliding flight test:
At around 1.31 you can see the killer fake feathers gnashing at an imaginary pedestrian of superhuman speed!
This also caught my eye as I recall boat-tailers here mentioning instability:
"...The culmination of these effects produces a pressure distribution that increases the longitudinal stability of the airfoil..."
https://www.bamlab.princeton.edu/_fi...fd70b218cf.pdf