If 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 {TAIL ~ its y axis} works against the natural bending or flex of {HEAD ~ a folding boat hull} as illustrated in the canoe in the rapids, then a method is arrived at to control hull flex 
If 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 { TAIL ~ its y axis } works against the natural bending or flex of { HEAD ~ 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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