Для тестовой модели длиной около 38м расчет Loa дает значение 110м. Объем корпуса закрыт транцем и палубой. Сетка от -19.8 до 19.8. Непонятно, в чем ошибка. Картинка ниже.

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Main dimensions is not calculated values, you have to set up it yourself: