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Multihull vessels have more than one hull or hermetic body, such as catamarans and trimarans. They offer improved stability and deck space, and can be powered by motor or sail. Canoes and kayaks may also feature small stabilizers for added stability in rough water.
Multi-hull vessels are vessels intended to navigate in waters that have more than one hull or hermetic body. Catamarans are perhaps the most recognizable multihull boats, although other styles exist for specific purposes. A boater may choose such a design to improve stability, especially in rough water and at high speeds, and to maximize effective deck space. Ferries are commonly designed with more than one hull to improve speed and stability, and to allow more passenger-carrying space on the deck; many ferries also carry cars, so extra deck space is especially important.
Catamarans are multihull boats that have two different hulls oriented in parallel. A deck or frame runs between the two hulls, and this is where passengers and cargo will be placed while the vessel is in motion. This design is stable and fast; the amount of drag through the water is reduced because the hulls do not sink as deep into the water as a larger single hull boat does. These multihull boats can be motorized, or they can be powered by sails; Smaller multihull ships are more likely to be powered by sails, though not exclusively.
A trimaran is similar in design to a catamaran, but instead of featuring two hulls, the trimaran has three. The function of these multihull boats is somewhat different from that of a catamaran; the trimaran features a main hull in the center of the boat and two smaller stabilizer hulls that extend from either side of the main hull. The stabilizers are connected to the main hull with long struts. A trimaran is much faster and more stable than a single hull boat, although it is somewhat more difficult to maneuver due to its exceptional width. While the trimaran is capable of navigating shallower waterways than a single hull boat, she will not be able to navigate narrow waterways where a single hull design might work well.
Smaller craft such as canoes may also feature a multiple hull design. Some canoes designed for sailing will have one or more small stabilizers that extend from the main hull of the boat. This is done to aid stability in rough water or high winds. Kayaks may also feature small stabilizers designed for the same purposes. These stabilizers are usually removable so that the boater can paddle freely when additional stability is not needed. Therefore, these accessories are usually lightweight and compact.
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