Cataraft

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Cataraft is a contraction of the words "catamaran" (a vessel consisting of two hulls that float side by side) and "raft". Catarafts consist of two inflated pontoons, most often from 8' to 18' in length, strapped to a metal frame containing a rowing seat, oar locks, and oars. Cataraft floors may be open (often the case for whitewater), nylon mesh, or solid materials.

The main advantage of a cataraft over the more common rubber raft is maneuverability, as there is much less inflated tube in contact with the water. This results in less drag, both in terms of navigating river shallows and when faced with strong headwinds.

The main disadvantage is carrying capacity, for the same reason; there is less inflated tube to bear the weight of gear. Hence, a cataraft's main advantage is lost when overburdened. But the ease of maneuvering is a significant enough advantage that an increasing number of whitewater enthusiasts have made the switch from rubber rafts.