Reduction of jack-up and crane vessel resistance and bow swamping |
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| Authors: | Robert Latorre Julio Arana |
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| Institution: | aNaval Architecture and Marine Engineering, University of New Orleans, 70148 New Orleans, LA, USA |
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| Abstract: | A large bow wave forms when blunt-shaped vessels like self-propelled jack-up crane vessels (liftboats) operate at high speeds. Above a critical speed, this bow wave spills over the bow causing swamping. To investigate this phenomena, towing tank tests of a 1/25 scale model liftboat hull were done over a speed range of 3–8 kn. The test showed above 4 kn the bow wave formed and the vessel trimmed by the bow. At speeds above 8 kn the bow wave spilled over the bow (swamping). To cancel this critical bow wave a vertical bow plate was fitted ahead of the liftboat bow. This bow plate reduced the bow wave formation and achieved a 10–15% reduction in the towing resistance. The wave cancellation bow plate can reduce the liftboat power or increase its liftboat speed and operating range. |
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| Keywords: | Liftboat drag reduction UNO bow plate Swamping |
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