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Manufacturer of fishing, recreational, and touring kayaks - including the Carolina, Essence, Expression, Impulse, Prodigy, Tribe, Tribute, and Triumph models. [12] Perception Kayaks was founded by Bill Masters in the early 1970s. The company develops rotational molding of plastic kayaks, reducing the expense and maintenance of kayaks. [2]
Less common in the 1950s to 1970s was an "R-valve" which was equipped with a restriction that caused breathing to become difficult as the cylinder neared exhaustion, but that would allow less restricted breathing if the diver began to ascend and the ambient water pressure lessened, providing a larger pressure differential over the orifice.
The divers exit the bell and ascend on the lifting cable or, depending on circumstances, some other line leading to the surface. Umbilicals should be managed to limit snagging risk, and may have to be tended by the divers while leaving the bell.
Dropping weights can have an effect difficult to predict with accuracy, and dropping the minimum amount which allows the diver to ascend under control is desirable, as buoyancy may increase during the ascent, and an ascent with insufficient buoyancy can become an excessively buoyant ascent part way up, with a decompression obligation as a ...
A buoyancy compensator (BC), also called a buoyancy control device (BCD), stabilizer, stabilisor, stab jacket, wing or adjustable buoyancy life jacket (ABLJ), depending on design, is a type of diving equipment which is worn by divers to establish neutral buoyancy underwater and positive buoyancy at the surface, when needed.
Inability to achieve neutral or positive buoyancy, and potential difficulty or inability to make controlled ascent or to ascend at all. Catastrophic leak in buoyancy compensator: Loss of manifold fitting. Corrugated hose failure. Torn bladder. Maintenance and inspection of BC before use. Use of drysuit as emergency buoyancy control device