Aeroflexible Aerodynamics

[aerohead]

Originally Posted by euromodder

So ... birds use Coanda in order not to stall out.

At speed, the feathers would remain flush.
They lift as AoA increases, like a spoiler dumping lift, lowering AoA again before it gets out of hand (i.e. stalls out).

I believe that as the angle of attack reaches burble point the feathers are lifted into the low pressure of the turbulence.
Depending upon the birds intentions it can deploy its tail feathers and land on something,or it can morph to decrease the AOA,restoring a 'clean' configuration.
Or,as with the Peregrine falcon,it can tuck everything in close to its body and bound towards Earth at over 200 mph in its stoop.

[botsapper]

Even though bird wings do wing warp, the inspired nature of aeroflexible aerodynamics post - is more of the contribution of the flexible 'feathers' or shown acetate flaps on a RIGID airfoil that instantaneously and self-deploys (in localized/smaller separation zones) to create more drag at high angles of attack, lessening large stall dynamics. As in peregrine falcons, the drag is kept minimal as the flaps/feathers are kept tight to their rigid bodies.

...not exactly relevant to aeroflexible aerodynamics but more on self deploying flaps.

http://www.youtube.com/watch?v=uwID6XZ9UY8

[Jasen]

Interesting.
The thing that comes to my mind other then flight and driving are similar in there aerodynamics yet also have there unique caricaturists, birds wings are a in part, a manually controlled/reactive system.

There are some cars with active aero systems, but othere then an automatically lowering air damn and or suspension, most are to increase down force at the rear or a specific corner of the vehicle.

[redpoint5]

The video showed how the "feathers" allowed a natural dynamic stabilization to flight, but mentioned nothing about efficiency, or if it could decrease energy use.

I've seen flaps on the tops of the wings of various commercial jets that seem to react in a similar manner when turbulent air is encountered. I wonder if those are just large "feathers" and not actively controlled?