Type 917 Yang / Dong (Rescue Ship)
Since the 1980s, China has listed high-performance vessels such as trimaran as a special project of the National 863 Program, and has set up a national key laboratory for multi-hull vessels. After experiencing the stages from the previous theoretical research to the later model pool test, China has focused on some major key issues of the trimaran such as resistance and ship optimization technology, wave resistance and motion control technology, structural design technology, etc. Lloyd's classification society's trimaran specifications and other early conceptual design of the trimaran, preliminary data of the ship's layout, size and side and side hull approach, for the next step of the trimaran.
The North Rescue 143 rescue vessel is China 's first Type 917 three-body rescue vessel, not to be confused with Type 917 torpedo retriever. In 2012, it served in the North Sea Fleet a life-saving rescue detachment. The ship is the first three-hull ship type high-speed search and rescue vessel jointly developed by China's "Special Discipline Laboratory for Multi-hull Technology". The ship has many advantages such as fast speed, good stability, and full search and rescue equipment.
The 917 three-body rescue boat was built by the China Shipbuilding Guijiang Shipyard. A total of three ships were built: the “Northern rescue 143” ship, the “Dongshui 335” ship, and the “Nan rescue 511” ship, which were deployed in the North Sea Fleet, the East China Sea Fleet and The South China Sea Fleet's anti-life rescue detachment. The CSMC Guijiang Plant has long been responsible for the construction of various types of workboats under 70 meters and high-speed patrol vessels of less than 1,000 tons. It has also built 42-meter-class side wall air-cushion carriers, Nanjiao 86 and 47-meter aluminum wave-piercing doubles. The passenger ship "Strait" is also very familiar with the construction of such unconventional small ships.
The North rescue 143 three-body rescue vessel consists of three hulls with a main hull in the middle. There is one auxiliary hull of the same size on each side of the shoulder. The three elongated hulls share a main deck and superstructure, about 550 tons. A new life-saving dinghy is carried on the left and right sides of the rear end and is released by the davit.
The Type 917 trimaran South Rescue 511 belongs to the South China Sea Fleet Life Saving Branch. Perhaps because of this, the three-body-wearing vessel type in China has not given any tall positioning, this is a realistic, pragmatic attitude, from the 022 missile boat, to the present three-body vessel, the purpose is clear, single function, clear positioning.
East Rescue 335 is a 917 type three-body lifeboat, a risk-proof life-saving detachment. The ship consists of three hulls, the middle main hull, the two sides side by side have auxiliary hull, three thin hulls share a main deck and superstructure, drainage capacity of about 550 tons, the maximum speed of more than 35 knots, although this is no U.S. littoral combat ship, the speed is enough to conduct offshore search and rescue,
Quickly rescue ships in distress and the people who crashed the plane into the water and other tasks. The 917 three-body ship is China's "multi-body ship technology national defense key discipline laboratory" co-developed the first three-body ship-type high-speed search and rescue vessel, highlighting practical, not the pursuit of unrealistic high-tech, in the front of the cockpit installed a dual-mode H/PJ-14 type 30 mm rapid-fire gun, can be manually operated can also be operated automatically, Provide a certain amount of self-defense firepower for lifeboats.
As an important component of the completion of diversified military missions, the vessel will be tasked with offshore maritime search and rescue, rapid rescue of ships in distress and wrecked aircraft, and can be used in conjunction with medical ambulance vessels and helicopters to build efficient A fast and convenient rescue system.
The Model 917 is about 60 meters long, about 20 meters wide, and has a displacement of about 550 tons. A flight deck for Z-9 helicopter take-off and landing is available on the spacious rear deck. From the current public photos, it can be roughly estimated that the size of the rear deck is about 15 meters x 20 meters, which is quite close to the flight deck of the 054A frigate with a full load of more than 4,000 tons.
The successful attempt of the three-body rescue vessel not only provided reliable offshore search and rescue capabilities, but also provided practical experience for the planned new frigate project. In fact, the three-body frigates on display in China are not the first three-hull ship-designed warships in China. As early as the beginning of this century, the relevant domestic research units used the Chinese navy's next-generation frigates as the background, and conducted preliminary research on the practical use of the three-hull ship in military warships.
It is a pity that the proposed multi-purpose missile frigate design scheme for anti-ship, anti-submarine and air defense operations is more than 140 meters long, with a width of more than 30 meters and a displacement of 4,000 tons. Lost in the type of bidding. This is mainly due to the Navy's decision to consider the difficulty of directly constructing such a three-body combat ship.
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