The PELskin project-part V: towards the control of the flow around aerofoils at high angle of attack using a self-activated deployable flap

During the flight of birds, it is often possible to notice that some of the primaries and covert feathers on the upper side of the wing pop-up under critical flight conditions, such as the landing approach or when stalking their prey (see Fig.  1 ) . It is often conjectured that the feathers pop up...

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