(57) Abstract Objective With improvement of having easiness, while (while river descending) usingBoth of cancellation of the caught primary factor of the obstacle which you can put simultaneouslyAssuring in offer of the inflator bull boat for the river descent which is obtained aru. Constitution The toe of switch 4of a aerial cloth 4 '' in boat itself 1It adheres to the match region surface of Tip side of both air drums 1,1With, the rear end 4b '' shift on inside base 3of a boat itself 1Sticking, to begin and transfer, and the toe of switch 4of a another aerial cloth 4 '',The match of rear end side of both air drums 1,1 in boat itself 1As it adheres to the region surface, the rear end 4b '' the boat itselfAdhering on inside base 3of a 1, by the fact that it begins and transfers, the hand front and backIn order opening 5,5 for applying phase to oppose, it is constituted.
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