51. The generator drive engines fitted on your harbor tug are started by the type of starter shown in figure «A» of the illustration. What type of starter is shown

The illustration depicts an axial piston hydraulic motor, characterized by pistons arranged parallel to the output shaft and acting on a swash plate. This configuration distinguishes it from radial piston, turbine air, and sliding vane air motor designs, which have different structural arrangements not visible in the figure.