A method of launching a catapult, a catapult and a locking device for a catapult. The catapult comprises a carriage for fastening an aircraft. The carriage can be provided with a high acceleration by directing a launching force generated by a launching device thereto. The carriage can be held at a launching position by means of the locking device. The catapult further comprises a takeoff damper that generates a damping force having a direction opposite relative to the launching force. Accordingly, the takeoff damper restricts the acceleration of the carriage at the initial launching moments.