Abstract
A new appendage resistance prediction method, which mitigates the technical issues with the existing test procedure, has been developed and presented in this paper. The primary aspects of the new method are 1) the Froude's equivalent flat plate friction drag concept extensively used in the marine industry will not be used in the present method, instead, an aerodynamic profile drag concept for resistance prediction is presented, 2) the turbulent stimulators extensively used in existing model appendage resistance tests will not be used in the proposed test procedure, which eliminates the need for high-speed tests and the problematic issue of estimating the parasitic drag associated with turbulence stimulators, 3) the important juncture vortex drag associated with appendages is considered, 4) the effective velocity entering the stern appendages on resistance is considered, 5) the new scaling formula to relate model profile drag and juncture vortex drag to full-scale appendage drag is developed and presented in this paper.
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