Abstract: The invention is particularly adapted, but not limited to, control of hand-launched gliders. A weight or mass is suspended in the manner of a pendulum below the aircraft. The weight is controllable by a gimbal mechanism which allows the weight to be swung fore and aft and laterally. The gimbal mechanism includes members mounted to be rotatable about a fore and aft axis and a lateral axis, which axes intersect and are perpendicular to each other. Radio controlled servomotors are provided for individually rotating the gimbal members for controlling the position of the weight or mass for controlling the aircraft in flight. The servomotors are controlled by a radio by way of separate frequency channels.