# Skin girth

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**Skin girth** is a [measurement](/source/Measurement) of a [yacht](/source/Yacht) [hull](/source/Hull_(watercraft)).

Skin girth is specified in some design rules to handicap or match the capabilities of [sailing vessels](/source/Sailboat) of similar design such as the [12 metre](/source/12_metre) boats. Skin girth is measured by following the surface of the hull from a given elevation on the hull vertically from a specified fore-and-aft position. It differs from the [chain girth](/source/Chain_girth)[1] (see [convex hull](/source/Convex_hull)) which follows the skin on convex surfaces, but goes straight across the chord of concave surfaces, as a tight chain would.

## References

1. ["Rating Rules for Vintage Models"](https://usvmyg.org/rating-rules-for-vintage-models/). US Vintage Model. Retrieved 3 May 2024.

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Adapted from the Wikipedia article [Skin girth](https://en.wikipedia.org/wiki/Skin_girth) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Skin_girth?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.