Jiangnan Shipyard
SS "Yongfeng" was the first of four 780-ton s ordered from Mitsubishi by the Qing Empire in 1910. Under the deal signed between the Qing naval minister Prince Rui, his deputy Admiral Sa Zhenbing, and the Japanese, the first two ships were built in Japan and the second pair at Jiangnan Shipyard in China with Japanese technical help. All four ships differed slightly from one another. Due to their small size (less than 1000 tons displacement), these ships are also frequently referred as gunboats.