If {HEAD ~ the design} of the shape of the air bladders in the sides of a folding boat mimic the shape of the air mattress discussed above, and if their placement and orientation in the folding watercraft is such that the natural bending resistance about its y axis works against {TAIL ~ the natural bending} or flex of a folding boat hull as illustrated in the canoe in the rapids, then a method is arrived at to control hull flex 
If { HEAD ~ the design } of the shape of the air bladders in the sides of a folding boat mimic the shape of the air mattress discussed above , and if their placement and orientation in the folding watercraft is such that the natural bending resistance about its y axis works against { TAIL ~ the natural bending } or flex of a folding boat hull as illustrated in the canoe in the rapids , then a method is arrived at to control hull flex
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