Which component transfers motion from the control yoke to the elevator?

The single cable system is used to transfer motion from the control yoke to the elevator in many aircraft designs. This system operates by utilizing cables connected to the yoke, which, when moved by the pilot, pull or release the cables attached to the elevator control surfaces. The simplicity and directness of this system make it effective for providing feedback and control precision to the pilot.

In contrast, a hydraulic system is typically used in larger aircraft for enhanced control and assistance but operates differently by using fluid pressure to move the control surfaces rather than a direct mechanical linkage. The airfoil system does not refer to a motion transfer mechanism; instead, it pertains to the design and characteristics of the wing or control surfaces themselves. Lastly, a mechanical lever, while it can transfer motion, is not the standard mechanism in typical aircraft for connecting the yoke to the elevator. The single cable system remains the most commonly used and reliable method in many aircraft configurations.