Rolling Period | Simple Harmonic Motion & GM Estimation | Mates exam, MMD Exam

Описание: This video explains the Rolling Period of a Ship, its relation to Simple Harmonic Motion, and how rolling period is used to estimate GM (Metacentric Height) — a core concept in Naval Architecture – Stability Phase-II for Chief Mate (FG) and MMD examinations.
The lecture blends theory + real ship application, especially for situations where ingress of water is suspected and stability must be assessed quickly by the Master.
📘 Topics Covered:
• Rolling as simple harmonic motion
• Effect of wave action on rolling
• Why rolling period is important for ship handling
• Measuring rolling period using a stopwatch
• Correct timing procedure on board
• Formula for rolling period: GM × f = 2k / T² (or f / T²)
• Relationship between rolling period and GM
• Effect of fuel/water/stores consumption on GM
• Estimating GM during a voyage
• Detecting ingress of water using rolling period
• Master’s decision-making based on rolling behaviour
• MMD-exam oriented guidance & examples
This lecture is highly useful for:
✔ Chief Mate candidates
✔ Deck Officers & Masters
✔ Anyone studying ship stability, rolling behaviour, or emergency assessment at sea
🛳 Visuals are used only for representational and educational purposes. © Sailor Rider
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