There is extensive research on how a fixed-position flap affects lift in the realm of fluid-structure interaction. So, researchers conducted a bio-inspired study with a novel twist — variable stiffness over time much like a bird can tense, or stiffen, the musculature and tendons connected to covert feathers — to learn more about how it affects lift. The results showed a 136 percent benefit.
Click here for original story, Model simulates variable flap stiffness for the best lift
Source: ScienceDaily