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Spitfire Mk.21 (etc) ailerons

Hello all,

Can someone tell me (or quote chapter and verse) exactly how the aileron on these functioned? Did the tab “drive” the aileron (spring tab) or did it just relieve the aerodynamic forces while the cables were moving the aileron in the good old fashioned way (balance tab)? And forgive me if I am using incorrect terminology.

Over,
bob

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