What is the minimum GZ required at an angle of heel of 30 degrees for a regular vessel?

• A. 0.1m
• B. 0.2m
• C. 0.3m
• D. 0.4m

Answer: (B)

The minimum GZ (righting arm) at an angle of heel of 30 degrees is critical for vessel stability. It indicates how well a vessel can return to an upright position after being heeled over by external forces, such as wind or waves.

For a regular vessel, a GZ of 0.2 meters at 30 degrees is considered the minimum requirement. This value ensures that the vessel has a sufficient righting moment to counteract heeling and maintain stability. A GZ of 0.2 meters provides an adequate margin for stability, allowing for safe operations in various conditions.

If the GZ is less than 0.2 meters at this angle, the vessel may not have enough righting capability, increasing the risk of capsizing. This underscores the importance of proper stability calculations during vessel design and operation, ensuring that the minimum GZ requirement is met for safety.

The other values listed (0.1m, 0.3m, and 0.4m) represent either insufficient stability (for 0.1m) or values that exceed what is typically regarded as the minimum standard for safe operation at that angle of heel.