1/10/2023 0 Comments Doctor who console calculatorBut how do you get there? Crude Weight Calculation: The question is, how much? While the answer is different for every diver, the goal is the same: carry enough weight to enable you to function efficiently and safely at all depths, and not a gram more.ĭivers are generally taught to define this as being neutrally buoyant at 5 metres (15 feet) deep while wearing an empty BC and carrying a nearly empty cylinder. To overcome the force of buoyancy you have to counterbalance it with ballast weight. We want to go down, but the inherent buoyancy in our wetsuits, our BCs, our lungs and our fat cells are all conspiring to keep that from happening. All the others are variables, changing during the dive along with time or depth or both. Your ballast weight and your trim are the only two factors that, once you've selected them, stay put. The factors that affect your buoyancy besides ballast weight are BC inflation, your trim, exposure suit, depth and breath control. In fact, perfect buoyancy control requires getting more than one thing right. Precise control of your buoyancy is what enables you to hover completely motionless and fin through the water, at any depth, without using your hands at all. There are many tricks, but pinpoint buoyancy control is the fundamental skill. Less BC inflation also means less buoyancy shift with depth, so you'll make fewer adjustments. That means less drag and more efficient finning. If you are carrying just the right amount of weight, you will have the smallest amount of BC inflation. The secret to pinpoint buoyancy control begins with fine-tuning your weighting - that's how much lead you thread on your weight belt, or put into your weight pouches. When all the big talk is over and the water closes over your head, there is nothing that pulls the whole scuba diving thing together like perfect buoyancy control. There's no denying that peak performance buoyancy control separates the dive paddlers from the pros. Lloyd Borrett doing deco above the USS Arkansas battleship at Bikini Atoll. "Any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object." - Archimedes
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