summary:

• eddy flaps prevent sudden drop in lift generation during stall

• pressure distribution indicates: eddy-flaps restrict eddy to hind part of aerofoil

outlook:

• automatic contour adapting flaps

• dynamic stall behaviour

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With flaps that were built according to the biomechanical properties of covert feathers of birds we were able to prevent the sudden drop in lift generation that usually accompanies flow separation.

The pressure distribution on the aerofoil indicates that the ‘eddy-flaps’ are able to contain the eddy in the hind part of the aerofoil, so that it cannot spread up to the leading edge of the aerofoil, where it would cause flow separation and therefore a decrease in lift generation.