The Type 062 gunboat is a class of gunboat of the People's Liberation Army Navy first developed and constructed in the 1950s. This unsophisticated class is relatively well-armed for its size and is the most widely built and exported Chinese naval vessel in terms of numbers. A total of 30 were built, initial boats being known as the Shanghai I class and later slightly improved boats being known as the Shanghai II class. The Shanghai I class was slightly smaller than its successor, the Shanghai II class, displacing 125 tons instead of 135 tons, and had a twin Chinese Type 66 57 mm gun mount forward. All other specifications are identical to the Shanghai II class, which replaced the 57 mm with twin 37 mm gun mounts. Some boats remained in active service well into the early 1990s in the PLA navy and longer in the case of the Korean People's Navy. Origin Type 062 gunboat is a result of several competing/developmental designs, all in response of PLAN's request of a new 100 ton gunboats, first of which was Type 0108 gunboat that was based on PLANS Sea Whale (Hai Jing, 海鲸), an E-boat that was ex-ROCS No 101. Specification: Displacement: 110 ton Length: 33.5 meter Propulsion: 4 ex-Soviet M50F-3 diesel engine, 4800 horse power, 4 shafts Armament: 1 twin 37mm, 1 twin 25 mm guns Speed: 30.4 kt Also referred as “81 gunboat (81炮艇)”, construction begun in November 1958 at Naval Shipyard 301 (current Plant No. 4808), and completed at the end of 1959, but proved not successful, with only 1 unit built and since retired. A follow-on design was the Type 0110 gunboat, which was built by Huangpu Shipyard (Naval Shipyard No 201), with a total of 3 completed in 1960. Specification: Displacement: 120 ton Length: 35.53 meter Beam: 5.48 meter Draft: 1.6 meter Propulsion: 4 ex-Soviet M50F-3 diesel engine, 4800 horse power, 4 shafts Armament: 1 twin 37mm guns, 1 twin ZPU-2 14.5 mm machine guns Speed: 28.5 kt Endurance: 650 nm Based on experience gained from Type 105, 0108, & 0110, PLAN issued a new requirement which was assigned to Dalian Shipyard, with the first unit completed in 1961, designated as Type 0111. Specification: Displacement: 115 ton Length: 38.78 meter Propulsion: 4 ex-Soviet M50F-3 diesel engine, 4800 horse power, 4 shafts Armament: 1 twin ZIF-31 57 mm, 1 twin 25 mm guns Speed: 30.2 kt After