How do gliders fly in circles?

Answer 1

Gliders circle by turning. This needs a down aileron on trailing edge of the outside wing, and up aileron on the trailing edge of the inside wing, and a little inwards rudder to balance the different drag from each wing, and a little down elevator from the horizontal tail trailing edge to keep up the speed even though the drag has increased. So when a glider flies in circles, it descends, unless there is an updraft.