Flat-Bottomed Flat bottom boats are usually small open boats such as john-boats. Flat bottomed boats can easily ride on top of the water at high speeds. Flat bottom boats are typically used on calm waters such as small lakes and slow rivers because they do not handle well in choppy water, especially at very high speeds. Flat bottomed boats are not very stable, however, as they move with the flow of the water.
Deep-V-Hull
V-hulls are designed to operate at high speeds and to "cut" through rough water, which provides a smoother ride than flat-bottomed or round hull boats. V-hulls are not as efficient as flat or round bottomed boats, and need larger engines to move at similar speeds. Most of the boats sold today are V-hulled in one way or another. However, they may tip over sideways under high side-winds.
Round Bottom Hull
Round bottom boats almost "glide" through the water. Most cruising sail and power boats have rounded hulls because they are efficient at moving through water. Typically, round hulled boats move at slow speeds.
Cathedral Hull
Cathedral or multi-hulls, are two or more hulls attached closely together. This combination of hulls makes sure there is much more stability than what is found in other hulls.The air between the two hulls can provide lift and make sure there is less drag on the boat from the water. However, the extra air resistance may flip the boat over if it is too light.
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