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Dear friends and followers, welcome back to my channel and to a great video about the split rudder you see on most wide-body aeroplanes.
The primary flight controls such as the ailerons, elevator and rudder are hydraulically powered. In case of the Boeing 747 which has four independent hydraulic systems, 1, 2,3 and 4 are each powered and pressurized by its respective engine. Now if we look at this schematic, you see that tail fin rudder or vertical stabilizer is split into the upper and lower rudder. The upper rudder is deflected to either side by three actuators, two of them powered by hydraulic system number three and one by system number one. The lower rudder comes with two actuators one powered by system number two and the other by system number four.
As you apply force into the rudder pedals to either side, both the upper and lower rudder will be deflected simultaneously towards the given input.
The slower you fly the more deflection you need of the rudder to have an effect and the faster you fly, the less deflection you need.
So for example, as she comes in for landing, if the pilot applies full left or right rudder, it will go to the maximum deflection of 31.5 degrees, which sometimes can be necessary in strong crosswind conditions. During cruise or speeds higher than 350 knots, with the same amount of input into the pedals, the rudder will only deflect 5 degrees and less to either side.
But as an airline pilot, you always expect the same reply of your plane, no matter the speed. Therefore, airplane engineers have fitted the flight control system with a so-called rudder ratio changer. The general purpose of the rudder ratio changer is to gradually reduce the surface deflection of the rudder by the pedals with increasing airspeed. Please do not mistake this with the yaw damper, that´s a whole other system.
But see more in the video!
Thank you very much for your time! I hope you enjoy this video!
Wishing you all the best!
Your "Captain" Joe
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