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It is listed in the Navy's inventory as a "miscelaneous craft." We've corrected the headline. Navy says the ship was for research purposes only, "was never intended to be mission-capable" and did was not designated as a "USS" vessel. Eastern - several readers have noted that Lockheed built the Sea Shadow for the U.S. Navy reportedly has expressed interest in them as well. The first two will be formally commissioned into active duty later this year. The first was launched in 2000 the vessels are being readied for active duty. The original plan called for six Visbys in two classes - one for surface combat and the others for submarine hunting and mine detection - but cutbacks in the early 1990s by the Swedish government cut the fleet to five vessels. Some of the components are made of bronze instead of stainless steel to further reduce their magnetic signature. Water jets are about 10 to 15 decibels quieter than props, and to further minimize noise the Visbys use impellers with seven blades instead of five. Propulsion comes from two diesel engines and four gas turbines that power a pair of water jets. The vessels are capable of speeds exceeding 35 knots. "You actually need waterjets for these vessels, as they're more efficient than propellers at high speeds." "The need for agility and a high top speed meant that a light weight was an essential factor," Hjorth says. The plastic and carbon fiber hull displaces 600 tons of water, about half that of conventional, steel-hulled ships of a similar size.
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