Natural Period of Roll & Rolling Period Test — GM, Stability for Mates exam mmd

Описание: Natural Period of Roll & Rolling Period Test — GM, Stability & Exam Concepts Explained | Merchant Navy

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This video explains the *natural period of roll* and why it is one of the most important indicators of a ship’s stability.

You’ll learn how the period of roll relates to GM, how the Rolling Period Test is carried out onboard, and how exam formulas are actually used in practice.

📘 What You’ll Learn

• What “one complete roll” really means
• Natural period of roll — definition & concept
• Why TR depends on ship stability (GM & K)
• Full formula: TR = 2πK / √(GM × g)
• Meaning of radius of gyration (K ≈ 0.35 × B)
• Why roll period does NOT depend on roll angle
• How changing GM or cargo distribution changes TR
• Rolling Period Test — step-by-step procedure
• Empirical shortcut: GM = F × B / TR²
• When and why the test is used on small ships
• Limits, precautions, and common mistakes

This lesson is explained clearly with examples — useful for exams as well as real onboard stability checks.


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