MARITIME – AFETY, URVIVAL & RECUE CALCULATOR
Survival Craft Capsize
A precise tool.
What is the Survival Craft Capsize & How does it work?
The stability of a survival craft in rough sea conditions is governed by its righting moment, which depends on the relationship between the centre of gravity (KG) and the metacentric height (GM). A lower KG and higher GM increase the craft’s ability to resist capsizing. When a capsize occurs, rescue teams must apply a recovery load that overcomes the residual overturning moment. This load is a combination of the craft’s weight‑induced righting moment and external forces such as wind pressure on the exposed area. The calculation below provides a quick estimate of the minimum recovery force required to bring a capsized survival craft back to an upright position, allowing rescuers to size winches, ropes, or buoyancy aids appropriately.
R = frac{W cdot g cdot GM}{KG} + P_{w} cdot A
R = recovery load (N); W = displacement (kg); g = 9.81 m/s²; GM = metacentric height (m); KG = height of centre of gravity (m); P_{w} = wind pressure (N/m²); A = projected area (m²)
Parameters
Result
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Frequently Asked Questions
What is the relationship between center of gravity (KG) and metacentric height (GM) in a survival craft?
A lower KG and higher GM increase the craft’s stability, making it less likely to capsize.
How does wind pressure affect the recovery load for a capsized survival craft?
Wind pressure adds to the external forces that must be overcome by the recovery load.
What factors determine the righting moment of a survival craft?
The righting moment depends on the relationship between the center of gravity (KG) and the metacentric height (GM).
How does a lower metacentric height (GM) affect the stability of a survival craft?
A lower GM decreases the craft’s ability to resist capsizing, making it more unstable in rough seas.
What is the purpose of calculating the recovery load for a capsized survival craft?
The recovery load helps rescue teams determine the force needed to right and recover a capsized survival craft.
How can I increase the stability of my survival craft in rough sea conditions?
To increase stability, lower the center of gravity (KG) and raise the metacentric height (GM).
What is the significance of the residual overturning moment in a capsized survival craft scenario?
The residual overturning moment represents the remaining force that must be overcome by the recovery load to right the craft.
Results are for informational purposes only and do not constitute professional advice.