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Speeding up Landing Craft

To reduce vulnerability to attacks from the coast and maintain safe operations with Landing Platform Docks (LPDs), the distance from ship to shore is continuously increased. To bring goods and people ashore as efficiently as possible either the number of landing craft utilities (LCU) or the speed has to be increased. However, the first is often not an option due to constraints on the capacity of the LPDs. Consequently, the Dutch Materiel Organisation (DMO) has requested MARIN to look into two feasible tracks.

Frans Kremer

Improving propulsors The first is to consider propulsion alternatives for the DMO’s existing LCU, which is 36 m long and 6.85 m wide, with 255-tonne displacement and a 65-tonne transport capability. During the upcoming mid-life upgrade, a modification of the vessel aft could be done in order to integrate a new propulsion system. As well as a version with ducted propellers, two different types of waterjets have also been investigated: a conventional waterjet, which

would require severe modification of the vessel aft lines and the second, a more integrated version.

The waterjet has an advantage in shallow water and for beaches. There is less risk of mechanical damage to the propulsor compared to the ducted propeller. However, the efficiency of the latter for lower speeds of around 12 knots is more advantageous. As the vessel transom will not sail dry, the waterjet will

20 report

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