A CONTROVERSIAL ASSUMPTION CONCEALED IN PERFORMANCE PREDICTION
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Some questions are raised concerning traditional thinking on calculating ship performance, and some new formulas are proposed. The assumption referred to in the title is that in using open-water measurements for any purpose in ship design, the characteristics determined in the uniform onset velocity of the open-water test will serve, instead of the characteristics that apply to a ship model when propelled and when the screw operates in a completely different velocity field governed strongly by the shape of the hull upstream of the screw.