Ulstein Group has introduced the X-Stern, a design feature increasing OSV operability through positive effects on station keeping, wave response, comfort and safety in harsh conditions.
The X-Stern is characterised by a sloping and higher stern, allowing for a sharp stern shape in which the transom plate is replaced by a pointed aft.
"An X-Stern vessel can stay on position in harsh weather with the stern towards waves, wind and current," said the naval architect.
"For vessels where the best possible motion characteristics are vital, positioning the X-Stern towards the weather instead of the bow will be the captain's natural choice."
The X-Stern concept leads to reduced pitch and wave drift forces, as well as eliminating slamming. The concept also reduces power and fuel consumption whilst engaged in dynamic positioning.
Featuring several of the same characteristics as Ulstein's X-Bow concept, with additional ice operation capabilities, the design's gentle displacement reduces acceleration, pitch and heave.
The design also improves comfort and safety, as well as increasing the vessel's operational window.
"There will be no sea on deck, and ice build-up in cold climates will be reduced due to the stern shape and enclosed nature of the aft deck," continued Ulstein.
