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8A4-class ROUV
The 8A4 class ROUV is a remotely operated underwater vehicle (ROUV), a Chinese ROUV used to perform various underwater tasks ranging from oil platform service to salvage and rescue missions. The 8A4 is a member of a series of related ROUVs developed in the People's Republic of China, with improved versions designed using earlier versions or commercially available versions as a starting point. The predecessor to the 8A4 is the RECON-IV, which is an improved version of the American RECON-III. The 8A4 is an improved version of the American AMETEK 2006. The 7B8 is an improved version of the 8A4.〔(8A4 ROUV (in Chinese) )〕
==Recon-IV Rouv==
The origin of 8A4 traces back to the RECON-IV ROUV. Since the 1980s, China begun to operate ROUVs to support its offshore oil drill operations and salvage operations, such as Hysub 10 ROUVs and Hysub 40 ROUVs supplied by the Canadian firm International Submarine Engineering in British Columbia. Hysub 40 ROUVs was deployed by Shanghai Salvage Bureau and proved its worth not only in oil drilling operations, but also in salvage and rescue missions. However, these foreign built ROUVs were simply too expensive to be adopted in significant numbers, and the salvage operational needs of the People's Liberation Army Navy (PLAN) could not be met. As a result, China decided to develop its own version of ROUVs with similar capability.
One of the first ROUVs domestically built in China was the RECON-IV ROUV, which is based on the American RECON-III ROUV built by Perry Oceanographic (later purchased by Lockheed Martin) based in Riviera Beach, Florida. Based on the technology transfer, the Shenyang Institute of Automation of the Chinese Academy of Science and Perry Oceanographic jointly developed the RECON-IV ROUV, which was adopted by People's Liberation Army Navy for salvage and rescue operations. However, like earlier ROUVs, the RECON-IV is primarily designed for civilian operations and had its limitations in performing certain military operations, such as cutting through specialized steel used to build certain compartments of submarines that were stranded, and opening some valves on sinking vessels, thus a more capable follow-up was needed.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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