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To answer your question about rudder reversal on the Dr1, here it goes.
Although you would expect rudder pedal force to increase with pedal deflection right up to the stops, this does not always happen.Sometimes the pedal force will begin decreasing above a certain rudder angle.In some cases the pedal force can reduce to zero ,or even reverse.This is called rudder reversal , or rudder lock, and is caused by the stalling of tne vertical stabilizer at large angles of side slip. This occurence is typical with full flying rudders such as those on the Dr1.
FYI
C.Grube
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