The propulsive coefficient combines hull efficiency, propeller efficiency, and relative rotative efficiency with other inputs needed to estimate a ship's attainable performance. Such calculations provide a forensic check on published speed and power claims. Agreement increases confidence in the official figures. A mismatch shows that the inputs and reported result do not fit the same model, which requires investigation before deciding whether someone altered the figures.
Chapter · 39:08-41:57
Using propulsive coefficient to test historical performance claims
Hull, propeller, and relative rotative efficiency provide a mathematical cross-check on whether reported ship performance is physically plausible.