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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