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A directional control surface, usually mounted on an aircraft's vertical stabilizer, which causes an airplane to yaw (and, sometimes, roll) to the left or right when deflected.

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Why are there double hinge lines on the rudders of the Grumman C-2?

2 hinge lines will give the rudder more authority because it will direct the air more aggressively. We can think of rudders as vertical and two way extending flaps. … increasing yaw control authority is to increase the distance between the empennage and CG hence increasing torque caused by aerodynamic force, the other way is to make the vertical stabilizer and the rudder
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