"Tumblehome is a term describing a hull which grows narrower above the waterline than its beam", with "beam" being its width at its widest point. https://en.wi

"Tumblehome is a term describing a hull which grows narrower above the waterline than its beam", with "beam" being its width at its widest point. https://en.wikipedia.org/wiki/Tumblehome https://en.wikipedia.org/wiki/Tumblehome