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Whitewater buoyancy aids are designed to provide enough buoyancy in fast whitewater rivers, should the paddler capsize and leave the kayak. They are often more bulky than Slalom/Polo vests, but are usually cut short at the front to allow the paddler to lean further forward despite the thicker foam and allow good trunk rotation for quick turns.
Personal flotation devices being worn on a navy transport . A personal flotation device (PFD; also referred to as a life jacket, life preserver, life belt, Mae West, life vest, life saver, cork jacket, buoyancy aid or flotation suit) is a flotation device in the form of a vest or suit that is worn by a user to prevent the wearer from drowning in a body of water.
The buoyancy compensator is intended to control buoyancy of a diver and their personal diving equipment, including stage and bailout cylinders, and for minor additional equipment such as reels, cameras and instruments that are lightweight or near neutral buoyancy. It is not a buoyant lifting device for heavy tools and equipment.
An extra low-pressure feed from the regulator first-stage lets the lifejacket be controlled as a buoyancy aid. This invention in 1971 of the "direct system," [citation needed] by ScubaPro, resulted in what was called a stabilizer jacket or stab jacket, and is now increasingly known as a buoyancy compensator (device), or simply "BCD". [citation ...
Buoyancy problems due to weight of tools—Inability to achieve neutral buoyancy for ascent and positive buoyancy on surface. Increased risk of drowning. difficulty in controlling ascent rate. Risk of losing tools if they must be abandoned. Carrying an excessive weight of tools. Tools may be lifted and lowered to the worksite using a rope. [68]
Buoyancy control with a rebreather differs from open circuit in two ways. The change in mass of the diver during the dive is smaller, as less gas is used, and the change in buoyancy during a breathing cycle is negligible, so fine buoyancy adjustment by controlling the volume in the lungs does not work.
It is also referred to as a torpedo buoy (often called a "torp") because of its shape. Because of its rigidity, it is slightly more hazardous in surf conditions. However, the rescue buoy generally has more buoyancy than a rescue tube, allowing the rescuer to assist multiple victims There are several colors and sizes available commercially.
Birds that swim, however, must contend with the increased buoyancy effects of having lighter bones and a reduced body mass. Instead, diving birds increase their muscle mass, resulting in an overall increase in body mass that reduces the effects of buoyancy and makes submersion easier.
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