Thats an easy one. Thats where the plane is connected to wires which go out to a control handle. The control handle controls the elevator to make the plane climb, or loop as it flys in a big circle around the pilot. The wires also keep the plane from flying off into the wild blue yonder. The planes engine is adjusted for high rpm and has no throttle. The pilot simply takes off and then flys the plane until the engine runs out of fuel. [8D]