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The "Customs 201G," a small waterline catamaran designed by the 702 Research Institute, recently underwent testing and was officially handed over to coastal authorities in Guangdong. This vessel marks a global first with its innovative steel and glass-fiber-reinforced plastic hybrid structure. It is also equipped with a domestically produced MTU8V396 diesel engine weighing over 250 tons, showcasing China's growing capabilities in maritime technology. Renowned experts, including Wu Yousheng, an academician of the Chinese Academy of Engineering, and Cai Daming, the Party Secretary of the 702 Research Institute, were present during the trial and final acceptance.
The original "Customs 201" was delivered to Shenzhen Customs in 2001 and was primarily used for anti-smuggling operations and monitoring three islands. In March this year, the user requested a major overhaul, transforming the ship from a surveillance vessel into a patrol boat. The modification included a central hollow design, modern navigation and communication systems, VIP reception areas, meeting rooms, and enhanced safety features, allowing for up to 20 crew members on board. Despite a weight increase of 18.3 tons, the question remained: could the speed and safety of the new version match the original? Although the client trusted the technical expertise of the 702 team, they still required a formal commitment from the institute before proceeding.
Within just over three months, the entire development team at 702 worked tirelessly, maintaining high standards of precision and attention to detail throughout the process. From initial design to simulation tests, and from actual reconstruction to final assembly, the team completed the project after more than 100 days of meticulous work. According to estimates, the modified "Customs 201G" increased its displacement by 13.3 tons while maintaining all original technical specifications.
During sea trials off Sanmen Island in the South China Sea, at coordinates 22°N, 16°E, with a water depth of 23 meters and wave height of 3, the vessel reached speeds of 18 knots at 2000 RPM and 18.1 knots at 2100 RPM—showing a one-knot improvement. The shipowner was impressed by the stability and safety of the vessel at these speeds, highlighting the success of the upgrade.
The successful transformation of the "Customs 201G" represents a significant advancement in the design and performance of small waterplane area twin-hull (SWATH) vessels by the 702 Research Institute, setting a new benchmark in domestic maritime engineering.