X-bow (shipbuilding)
Encyclopedia
The Ulstein X-bow is an inverted ship's bow
Bow (ship)
The bow is a nautical term that refers to the forward part of the hull of a ship or boat, the point that is most forward when the vessel is underway. Both of the adjectives fore and forward mean towards the bow...

 designed by Ulstein Group to improve handling in rough sea, and to lower fuel consumption by causing less hydrodynamic drag. It is shaped somewhat like a submarine
Submarine
A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which has more limited underwater capability...

's bow.

As of 2010, 15 X-Bow vessels of different types are operating.

The Bourbon Orca, design AX104 is an Ulstein A-Series Anchor Handling Tug Supply vessel, built for Bourbon Offshore Norway, and was the first ship built with the Ulstein X-bow in 2006. The operator claims that the design achieves higher speed and a calmer motion in rough seas.

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