WING FOLDING

A control system for a moveable control surface on a wing or stabilizer of an aircraft, for example a flying car, comprising: a wing or stabilizer having a moveable control surface (20, 22); a mounting structure (30) for mounting the wing or stabilizer on the body of an aircraft; a hinge connection (32) between the wing or stabilizer and the mounting structure, to allow the wing or stabilizer to be moved between extended and folded positions; and a control shaft mounted on the mounting structure and extending into the wing or stabilizer, the control shaft being configured to rotate under the influence of a control input so as to move the control surface on the wing or stabilizer; wherein the control shaft comprises separable first (36) and second shaft parts (44), the first part being mounted on the mounting structure, and the second part being mounted on the wing or stabilizer, the first shaft part having a peg (38) with a non-cylindrical outer surface, and the second shaft part defining a bore (46) with a non-cylindrical inner surface, such that, when the wing or stabilizer is in the extended position, the peg is engaged in the bore so as to prevent relative rotation of the first and second shaft parts; the system further comprising a resiliently-biased locking pin (62) mounted on the wing, the locking pin having a non-cylindrical outer surface, wherein the locking pin is configured such that it is biased into the bore when the peg on the first shaft part is withdrawn from the bore so as to lock the second shaft part against rotation and prevent movement of the control surface.