MARITIME – AILING PERFORMANCE CALCULATOR
Capsize Screening Factor
A precise tool.
What is the Capsize Screening Factor & How does it work?
The Capsize Screening Factor (CSF) is a simple, dimension‑less index used to gauge a sailing vessel’s initial stability against capsizing in offshore conditions. It compares the beam (width) of the hull to its displacement, reflecting how much buoyant volume is available to right the boat when heeled. A lower CSF indicates a narrower, heavier‑displaced boat that is generally more resistant to capsizing, while a higher CSF suggests a wider, lighter‑displaced craft that may be more vulnerable in heavy seas. The factor is especially valuable for designers and sailors when assessing the suitability of a boat for long‑distance, offshore passages. In practice, a CSF value below 2.0 is often cited as a benchmark for offshore‑capable yachts, whereas values above 2.0 may be acceptable for coastal cruising but warrant caution in extreme weather. Understanding and calculating CSF helps sailors make informed decisions about load distribution, equipment, and safe operating limits.
CSF = \frac{B}{\Delta^{1/3}}
B = Beam (m), \Delta = Displacement (tons)
Parameters
Result
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Frequently Asked Questions
What is the Capsize Screening Factor?
The Capsize Screening Factor (CSF) is a dimensionless index that compares a boat's beam to its displacement to evaluate its initial stability against capsizing.
How do I calculate the CSF for my boat?
To calculate CSF, divide your boat's beam by the square root of its displacement in cubic feet. A lower CSF indicates better stability.
What does a low CSF value mean for my boat?
A low CSF value means your boat is narrower and heavier, making it more resistant to capsizing in rough conditions.
Can the CSF help me choose a safer sailboat?
Yes, using CSF can help you select a sailboat that is better suited for offshore sailing by ensuring it has adequate stability.
What factors should I consider when interpreting my boat's CSF?
Consider the type of sailing you plan to do, weather conditions, and your experience level when interpreting your boat's CSF.
Results are for informational purposes only and do not constitute professional advice.