Abstract <p>A launching device having a constant traction force based on elastic hinges with an assigned characteristic is considered. The elastic hinge in this case represents a pneumatic spring moving between the guides of a calculated shape. The restoring moment of the elastic hinge is set such that the traction force of the launching device is constant almost throughout the entire working area. In the case of such a characteristic, the accumulated energy at the same maximum tension force is significantly greater than that inherent in the existing catapults and crossbows. It is proposed to use such a launching device as a catapult for unmanned aerial vehicles (drones) and crossbows.</p>