The model HDU (Hydraulic Drive Unit) is a type motor with "hydraulic piston group" integrated on shaft propeller (photo. 1, 3, 4, 5).

It can be used as transversal thrusters for the bows or the stern, or as estern device of propulsion for transfer .
The "HDU" DRIVE UNIT is an extremely versatile system component in various aspects: it is lightweight and relatively small in relation to the power it manages and its positioning is not limited by connection to an energy source: even when immersed.