Net buoyancy is a force associated with a displaced fluid in a gravitationally static equilibrium boundary condition. The force resultant is equal to the displaced volume multiplied to the specific gravity differential between the fluid being displaced and the fluid of inflation (78%N2) ….generally 62.4lbs/ft^3 (imperial measure).
Residual buoyancy is the remainder of the inflatable diaphragm, i.e., gross buoyancy less net buoyancy negating the mass of the diaphragm. Gross buoyancy is the upwards force of the entire diaphragm being submerged.
More important than net buoyancy is righting capacity or its acceleration to static equilibrium condition. A round inflatable diaphram with ¼ of its diameter submerged has 80.5% residual buoyancy. A round diaphragm with 1/3 of its diameter submerged has 71% residual buoyancy, the net effect of a round diaphragm becoming more efficient as its percentage of immersion increases. One may ask, “Where is this taking us?”
The most pristine stretches of the most beautiful streams are only accessible by the most efficient inflatable diaphragms. That’s 3 mosts in the same sentence for those counting. Water weighs .0361 lbm/in^3. The hydrostatic pressure of water at 8” deep is 0.29 psi. The hydrostatic water pressure at 6” deep is 0.22 psi; similarly .144 psi for 4”. I submit that USA manufactured inflatable diaphragms are the only diaphragms capable of transporting you across the upper stretches of the most pristine streams and waterways. Commie diaphragms lack form as well as style and allow you to drown in the process. All this and a drag on the US economy, I submit.
If you are in the recently aforementioned group, having purchased a commie......,please repeat after me: “I’m a dumbass for buying a commie diaphragm”. Your guilt being absolved, you can now move on. If in doubt, please call and discuss the finer points of the USA inflatable.
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