Dark Harbor
Stability Calculations

Now that the 'Vertical Center of Gravity' has been established Dynamic Stability for the Orginial - Plank on Frame version can be calculated.

With the ‘Stability’ results for the wood version of 'Dark Harbor' at hand for angle of heel will be of the most interest. 

• Thirty-degree (30) angle of Heel : - This angle of heel is considered the high end of the normal sailing range.
• The Angle of heel where the Rail of 'Dark Harbor' meets the water. 
• Maximum Righting Moment Angle: -  Beyond this angle of heel, the Righting Moment starts to decrease until it vanishes at the AVS – Angle of Vanishing Stability.  
• AVS – Angle of Vanishing Stability: -  This is the angle of heel that the hull will overturn. 

Minimum AVS – Angle of Vanishing Stability Values: 

·  Protected water sailboats can have an ‘AVS’ as low as 90- degrees.

·  A 'Coastal Cruiser' would have an 'AVS' of at least 110-degrees.

·   For offshore sailing where wind and large breaking waves are a real possibility, the 'AVS' should be no less than 120-degrees.  If wind and seas overturned and inverted a boat with an 'AVS' over 120-degrees, it would probably right itself in two minutes, whereas a  boat with an ‘AVS’ of 150-degree and over would right itself on the next wave.

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