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The ''Spearhead''-class joint high speed vessel (JHSV) is a United States Navy-led shipbuilding program to provide "a platform intended to support users in the Department of the Navy and Department of the Army. The Joint High Speed Vessel (JHSV) program is a cooperative effort for a high-speed, shallow draft vessel intended for rapid intratheater transport of medium-sized cargo payloads. The JHSV will reach speeds of and will allow for the rapid transit and deployment of conventional or special forces as well as equipment and supplies."〔(【引用サイトリンク】title=Joint High Speed Vessel (JHSV) )〕〔(【引用サイトリンク】title=Joint High Speed Vessel (JHSV) )〕 In September 2015, the Navy decided to redesignate the JHSV class of ships as the Expeditionary Fast Transport (EPF).〔(A New Class of Ship – 'Expeditionary Support' ) - Navytimes.com, 3 September 2015〕 ==Capabilities== The JHSV is able to transport U.S. Army and U.S. Marine Corps company-sized units with their vehicles, or reconfigurable to become a troop transport for an infantry battalion.〔 The JHSV has a flight deck for helicopters and a load ramp that will allow vehicles to quickly drive on and off the ship. The ramp is suitable for the types of austere piers and quay walls common in developing countries. JHSV has a shallow draft (under ).〔 A JHSV is essentially an aluminum twin-hull catamaran shell containing four diesel engines, rudimentary control facilities for up to 40 crewmembers, and 312 airline-style passenger seats, along with an expansive flight deck on the top. The rest of the vessel is an empty mission bay that can be loaded to carry whatever cargo is needed.〔(Navy’s Newest Ship Is Pickup Truck of the Sea ) - Wired.com, 19 September 2011〕 Vehicles and cargo are loaded and unloaded by a ramp that can support up to 100 tons of weight. Although designed for a military crew of 46, the ships usually have a crew of just 26 mariners. The passenger room contains reclining seats with overhead televisions and racks for weapons and equipment.〔(Navy explores new roles with first-in-class USNS Spearhead ) - Stripes.com, 29 April 2014〕 A vessel has 104 permanent berthing spaces. Without resupply, it can support 312 embarked personnel for four days, or 104 personnel for 14 days.〔 The design is 70 percent in common with the Hawaii Superferry, also built by Austal USA. The JHSV has a greater level of comfort for the crew and passengers than larger Navy ships for short-term embarkations. The interior is spacious and berthing areas have private features like toilet stalls, outlets, air conditioning, and even thermostats; there is no gym on board. One disadvantage of the ship's design is stability in rough seas and at high speeds. At 10 knots in calm sea states, the hull can rock up to four degrees to each side, while conventional ships would roll very little, which would increase if the ship goes faster in rougher conditions, raising the possibility of seasickness.〔 To achieve its top speed, the ship has to be traveling in waters not exceeding sea state 3 (waves up to high). At sea state 4 it can travel up to 15 knots, travel only 5 knots in sea state 5, and has to hold position in any sea state higher; while this might be seen as an operational limitation that can delay its arrival to port facilities, the ship was intended to operate closer to shore rather than in blue water conditions. As of late 2014, a JHSV costs $180 million to build and has an annual operating cost of $26 million.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Spearhead-class joint high speed vessel」の詳細全文を読む スポンサード リンク
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