has abstract
| - Type 814A spy ship with NATO reporting name Dadie(大谍, meaning Big Spy) is a type of Chinese spy ship in service (as of 2014) with the People's Liberation Army Navy (PLAN). Originally, a total of four ships were planned, but eventually, only one was completed due to the availability of newer designs. PLAN originally issued a requirement of four spy ships to meet its urgent need, after the failure of the earlier cancelled Type 812. To speed up the program, PLAN suggested adopting the hull of Type 635C hydrographic survey ship. The 1st Directorate of the 708th Institute of China State Shipbuilding Corporation, which is also more commonly known as China Shipbuilding and Oceanic Engineering Design Academy (中国船舶及海洋工程设计研究) nowadays, was assigned to design the ship. However, after the design was completed, it was revealed that the design could not meet requirements issued by PLAN during design review. On March 25, 1980, PLAN issued an order to revise the design to 1500 tons, designated as Type 814. On June 30, 1980, the 708th Institute completed the revision. However, due to drastic changes made by PLAN, it was once again revealed during design review that the revised design could not efficiently meet the new requirements issued by PLAN. The designer recommended enlarging the ship by increasing the displacement by twenty percent from 1500 tons to 1800 tons. The recommendation was accepted and in February 1982 the revision was completed, and in August 1982, design was completed. The finalized design is designated as Type 814A. In August 1983, design work for construction was completed and construction began on December 22, 1983. During sea trials, various aircraft and naval warships were deployed in support of trials, including Type 033 submarines, Harbin SH-5, Harbin H-5, submarine chasers, Type 051 destroyers and Type 403 shore based radars. On-board systems such as acoustic, radar, communication, and optical systems proved satisfactory and the ship was accepted into service in the North Sea Fleet. Because the previous design was experienced excessive vibration, particular attention in design was given to reduce vibration. Type 814A is designed to withstand wind scale of 12. The name of the ship is Bei-Diao (北调, meaning North Investigate) 900. (en)
- 814A型近中海侦察船(也称大地級情報收集艦)是1980年代中国人民解放军海军建造的一種重型巡邏艦,武裝不多,但是噸位達到護衛艦、巡防艦等級。屬於特殊任務艦,也可用做護漁等任務,僅有一艘北海艦隊的"北調900"號船,曾用名称北调841、V841、向阳红28号,武器還是以機砲為主,必要時可加裝一些外掛武器。 (zh)
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