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Wake, Thrust Deduction & Hull Efficiency

Inside this lesson
  • Define the wake fraction w and compute the speed of advance Va from the ship speed V
  • Define the thrust deduction factor t and compute the towed resistance R from the propeller thrust T
  • Compute the hull efficiency ηH = (1 − t)/(1 − w) and explain why it can exceed 1
  • Combine ηH, the relative-rotative efficiency ηR, and the open-water efficiency η0 into the quasi-propulsive coefficient ηD

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Educational content covering topics typical of a first- and second-year marine engineering / naval architecture curriculum. Not a substitute for accredited coursework, and not suitable for real vessel design, operation, or safety decisions without review by a licensed professional engineer. References to classification societies, SOLAS, or MARPOL are descriptive context only, not compliance guidance.