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Positive to lift the nose up a little more and allow the air to get flowing over that lower hump which gives more lift to the wing. without the incidence the air flow goes more over the top of the wing than the bottom which pushes down thus you dont get the lift. usually with some underchambered airfoils even a 1 deg positive will make a huge difference
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Joe Huntley
In Progress 1/2 scale Fokker DVII
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