Originally Posted by busdriver
servo transparency is a case of the hydraulic servos being incapable of handling the change in load when a rotor system approaches retreating blade stall due to load factor.
The text books used to say "helicopters have symetrical aerofoils" which is not the case. With unsymetrical aerofoils the Center of Pressure moves along the Chord with different Angles of Attack, this is likely to be the cause of 'Servo
Transparency'. (Daft name). The theory used to be that the CoP was near the Pitch Change Axis