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From all the books I have read it seems that the maximum angle for a single element wing is around 12-16 degrees to the airflow.
The wing I bought from DJ Racecars for my track day kit car bears this out by only having adjustment holes up to 14 degrees.
The differences between the wing being flat, being half way angled and being fully angled is quite dramatic.
The Simon McBeath book on aerodynamics (published by Haynes) is probably the best all round reference on the subject for laymen and isn't very expensive.
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