Gliders as a rule have only one rudder, and this is in the rear.
To ensure rigidity the rudder must be stayed with guy wires.
The rudder may also be curved or warped in similar manner by lever action.
The ship's rudder got loose, and was secured with difficulty.
I used the paddle as a rudder, and to push floating timber away.
A sudden shift of the rudder shook the Vulcan ...