A radio-controlled model airplane, including: a fuselage; first and second wings connected to the fuselage; and a control system including: a battery; a receiver powered by the battery and arranged to receive radio frequency signals; and a computer powered by the battery, electrically connected to the receiver, and arranged to transmit control signals in response to the received radio frequency signals. The airplane also includes a first motor powered by the battery and arranged to receive the transmitted control signals to rotate a propeller; and a single flexible wire: passing through an opening in a distal end of the first wing; with a first end fixed to a point at or near a junction of the first wing and the fuselage; and with a second end for connection to a point outside of the model airplane.