Which hull type is characterized by the tendency to roll unless equipped with a deep keel or stabilizers?

The round bottom hull type is characterized by its smooth, curved shape, which allows for efficient movement through the water. However, this design can make it more prone to rolling, especially in choppy or rough conditions. The rounded shape provides less initial stability compared to other hull designs. Without a deep keel or stabilizers, a round bottom hull may have difficulty maintaining a stable position on the water, leading to a tendency to roll side to side. In contrast, other hull types, such as flat-bottom and deep Vee hulls, typically have a more stable configuration that helps resist rolling. This makes the round bottom hull best suited for calm waters or conditions where additional stabilization methods are employed.