Buoyancy, is regulated by A). The amount of air pressure you can maintain for a constant/consistent period in a given area, more air pressure equals more buoyancy, until the weight of the contents/air "trapped" overcomes the space provided. ie; a propane tank, empty, will float, on top of the water, full, it will sink, until the pressure is equal to the pressure of the depth of water, & if it weighs more than the structure of the tank allows for by the capacity of it's internal strength, then it will implode as the pressure increases with the depth. B). The displacement of mass, in a given area, vs the weight of the water ie; a 100 lb block of steel, sinks, vs a 100lb., also made of steel 12' boat floats It is the increased displacement of the mass over a larger surface area that allows one form of steel to float, & the other to sink. By reducing the impact of weight per square inch, allows for the 100 lbs. to float. Increasing the area of coverage by utilizing the same weight will increase the buoyancy, & reduce the amount of draft of the contact surface of the craft. Something to consider thinking about? No? This also applies to the inflatable pontoons. No?