The craft (1) is delimited circumferentially by a float (2) is closed on itself - same and comprising at least two superposed cylinders floating (3i, 3s). The lower insert (3i) is longer than the upper insert (3s), and extends locally (in 5) to the - beyond the upper insert (3s) towards the outside. The projecting part (6) bounded by the lower insert (3i) to the - beyond the upper insert (3s) is covered by a cover (7) fixed on the projecting portion (5) of the tube and on the lower part of the upper insert (6 projecting bordering this region.). Thus, the craft is provided with a protruding zone forming a bottom flange on which a person to the water can rise to be more easily in the boat.
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