MODEL STUDIES FOR AN OCEANOGRAPHIC SHIP DERIVED FROM AN OFFSHORE SUPPLY VESSEL
SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA
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During the last few years, a number of operators of oceanographic research ships have considered the Gulf Coast offshore oil well supply vessel type for possible conversion to a research vessel. Model experiments were conducted on such vessel types to determine the resistance and powering characteristics, the motions in head seas, and rolling in beam seas. The transverse stability was computed for calm water and following seas. Four different hull forms were considered. It is concluded that the most serious deficiency of the vessel type is the tendency to slam in a head sea. This may limit the maximum speed in head seas. The small saving in resistance exhibited by both the narrower and round bilge versions is insufficient to justify choosing either of these on this alone. In addition, both of these forms roll more severely than the two wide, single chine forms. Finally, the increased freeboard of the third form results in an ample margin of stability. It is felt that a single-chine design provides a suitable basis for developing a research ship design.
- Physical and Dynamic Oceanography
- Marine Engineering