Tools
Working Excel calculators: the same arithmetic the lessons teach, as sheets you can run on your own ship's numbers. Each one is included with its course, where a required exercise walks you through it step by step, and is downloadable by enrolled learners.
All calculators
Ship Resistance Fundamentals 1 calculator
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Hull-roughness penalty calculator Excel · for enrolled learners
Turns an average hull roughness reading into added power, tonnes and money: the penalty-per-micrometre assumption exposed as an input, with a sensitivity table pricing every combination of hull condition and assumption.