Ulstein has developed a range of X-Bow vessels for the RoPax market based on the company's "compact concept". Equipping the vessels with an X-Bow improves their seakeeping behaviour while reducing costs.
'RoPax is a segment in growth, where we will see fleet renewals in the years to come. We have for some time worked to integrate Ulstein’s design mindset into a range of RoPax vessels. These vessels are all equipped with the X-Bow hull feature, a natural choice when operating in climatically rough conditions,' said COO Design & Solutions, Tore Ulstein.
X-Bow
The X-Bow, or the inverted bow concept, results in a tapered fore ship shape with a different volume distribution as well as sectional angles. This results in a wave piercing effect at small wave heights, and reduces pitching and bow impact loads in bigger seas. When comparing fore ship volumes with more conventional, bulbous bow shapes, the X-Bow has more displacement volume starting from the waterline.
Instead of just rising on the waves and then dropping with colossal force, the X-Bow is able to absorb the force more consistently across its surface. This enables the ship to remain more stable during poor weather conditions, increasing comfort for passengers and crew alike. Additionally, because it uses less fuel to get through the waves, it also helps to save energy.
Benefits of the X-Bow for Ropax Vessels
Many RoPax vessels operate in harsh areas, for which the X-Bow was originally designed. The seakeeping behaviour of RoPax vessels is important to the integrity of the cargo and the comfort of the passengers. In many cases, the movements of a vessel call for a slow-down. This may in turn challenge the regular scheduling of a vessel. However, the X-Bow RoPax vessels will not need to slow down, even in fairly rough weather.
Compact Concept
The "compact concept" of shorter, wider and slower design solutions leads to high capacity vessels and less expensive newbuilds. The concept introduces higher flexibility with respect to vehicle logistics on board the vessels.
The propulsion system of the vessel can be designed according to the vessel’s operational profile and set schedule. A smaller propulsion plant will contribute to lower capital investments (CAPEX), less maintenance (OPEX) and reduced energy consumption (VOYEX), making the operation of the vessel more efficient.
The RoPax designs have been developed to be constructed in series for the volume market.
Picture courtesy of Ulstein.
