Few efforts have been made to compare model test results from different facilities for possible bias on the measurements. The purpose of this study was to investigate the differences in model test results of a trimaran hullform that exist among the towing tank facilities at four academic institutions: Webb Institute, United States Naval Academy (USNA) and University College London (UCL) and Stevens Institute of Technology. Two models (at 1/125th scale and 1/80th scale) of a US navy’s 268m trimaran concept design were built and tested at the four facilities to study the optimal side-hull location for calm water resistance. The model is equipped to facilitate movement of the side-hull location both longitudinally and laterally. Model tests were conducted for various outrigger locations over a range of Froude numbers from 0.1 to 0.5. The measurements included resistance, trim and heave. The agreement among the four facilities was found to be acceptable and the differences were explained in terms blockage effects and test methodologies.

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