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Notizen:
Working as a bionics project it is only natural to look at natures role model first.
So we tested the porosities of the bird feathers and found that the covert feathers are slightly porous.
This makes sense when we look at a schematic pressure distribution on an aerofoil.
When using impervious materials like plastic sheets, the flaps were lifted off the surface before the critical angle of attack is reached.
As a result, lift and drag are influenced negatively
