Axes and ‘X’s have become confused. The X bow was developed by the ship design division of Ulstein. It was developed In 2005 and had its first use on Bourbon Orca in 2006.
There is little Change below the waterline to a Normal hull, but the bow rises up And slopes massively aft from where The forward end of the bow would Be on a conventional Offshore Supply Vessel. The aim is similar To that of the Damen axe bow, with Better efficiency (through lower Hull resistance), better Performance In a head sea , less slamming and Higher maintained speed.
Axe bow
The Sea Axe was a logical Evolution of the work damen did in developing patrol craft that could maintain speed and Comfort in bad weather a complex formula (see Synfo Extras)defines the Axe Bow, but in Simple terms it has a higher bow, less change of water line beam, Finer entry, less (actually no) flare And a deeper bow, deeper than any Other part of the vessel; it resembles An axe in profile hence the name. Why the hull works is well illustrated By the difference in sound and pain If you slam the flat of your hand Hard on water or do the same with The edge. The comparison with Conventional enlarged and Sea Axe Forms is shown here Which shows the difference of Conventional hull enlarged ship at a Reduction of 75 to 80% with vertical Peak accelerations that was achieved In sea state 5 in the north sea .
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