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Ship Motions: The Six Degrees of Freedom

Inside this lesson
  • Name and define the six rigid-body motions: surge, sway, heave, roll, pitch, yaw
  • Explain why roll is typically the critical seakeeping motion
  • Relate the natural roll period to GM via T = 2π·k/√(g·GM)
  • Explain why a larger GM produces a shorter, stiffer, less comfortable roll

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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.