The NB50 is a versatile twin-screw tugboat, meticulously designed by Robert Allan for ship-assist, harbor duties, and construction support. With a low air draft and shallow navigational draft, it can access areas where many other tugs cannot operate. Configurable to achieve a maximum bollard pull of 30 tons, it offers exceptional power and adaptability for challenging tasks.

The NB50 design ensures high standards of comfort and functionality, accommodating up to four crew members. The lower deck features a combined mess and pantry, along with two double crew cabins sharing an en-suite. The wheelhouse provides excellent all-round visibility from the forward control station, equipped with conventional helm controls for precise and reliable handling. NB50 sets a new standard for efficiency and performance in the tugboat class.