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We at REEDEREI NSB have developed an entirely different widening concept. The ship will be cut in the hold area at amidships, where the load is low at right angles to the cut and the steel is therefore comparatively thin. The necessary cuts at right angles to the ship are made at the engine room front bulkhead and at the collision bulkhead. Here the bending moments are much lower than at the main frame. The front part of the ship is lengthened by a hold so that the form remains. It is trickier aft. However, we assume that the influence of an ideal form declines with speeds below 20kn. Thus, for a containership of medium size at 18kn the friction resistance is 67%, the wave resistance 9% and the form resistance 24%. The bulbous bow – which has to be replaced by a new one because of the widening anyways – is optimised for reducing the wave resistance with the aid of CFD methods for speeds below 20kn.
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