Servo control for variable geometry rudder - has hydraulic servos for end flat and pneumatic return springs (SW 10.7.78)

摘要

The variable geometry rudder has a small flap (20) pivoted about the rear edge of the main rudder and operated by a hydro pneumatic servo control to improve the steering effect. The return force of the flap is generated by gas springs. The two gas springs (30) are tensiong when the flap is moved relative to the rudder, with the self centering control (80) reinforced by hydraulic control.