The usual type of throttle control on motor and sailing yachts is called a single lever throttle. As the name suggests, there is one lever that controls the direction of the drive. When the lever is moved forwards or backwards from the neutral position, the drive is engaged in forward or reverse gear and accelerates. The propeller rotates depending on how far the lever is pushed forwards or backwards. Two Bowdencables are attached to each lever, which lead to a respective motor. The first cable tells the gearbox the direction it should move and thus determines the rotational direction of the propeller.
The second Bowden cable controls fuel injection and thus the speed. In addition, there is a device on the lever so that the throttle can be accelerated without coupling the drive, for this purpose there is a button on the lever. Alternatively, the lever can be completely removed.
On a ship with several motors, each motor has one lever. Operation is very simple, making user error practically impossible. However, abruptly switching from forward to reverse is very damaging for the gearbox.