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Quite correct, I should have said ‘control surfaces that don’t modify the shape of an aerofoil’.
You could probably argue that a spoiler does modify the camber/AoA of an aerofoil, analogous to the way a split flap does. At least, I say you could, but it’s 24 years since I last studied aeronautics and I’ve forgotten most of it, so my degree of confidence about what does and doesn’t modify an aerofoil’s camber/AoA is not high.
rodan
gbj_tester
There are spoilers with no curvature, and the effect on the aerofoil to which they are attached is not one of changing camber or AoA