Clemens used a standard R/C controller, which sends commands to a radio receiver installed in the airship’s control cockpit. The receiver is wired to each of the eight propeller motors. He can adjust the forward thrust of three motors on each side, and he can rotate the fourth to provide upward or downward thrust. To steer, the controller sends signals to a cable-and-pulley system in the airship’s tail that adjusts the rear fins to turn, ascend, and descend. The model airship can’t reach the original’s maximum speed of 80 mph, but it does cruise along comfortably at up to 15 mph.