Riga-class

The Riga class, designated Project 50 Gornostay by the Soviet Union, was a series of escort ships (Storozhevoi Korabl) developed in the early 1950s. Analogous to World War II-era destroyer escorts, the class was designed as a smaller and less costly alternative to the Kola class. Construction took place at shipyards in Kaliningrad, Nikolayev, and Komsomolsk-on-Amur. While 68 vessels were completed, the program was terminated in 1956 by Nikita Khrushchev, who categorized the design as obsolescent. The final vessel of the class entered service in 1959.

The design utilized high-pressure steam turbines and introduced new radar systems into Soviet naval service. Structural protection included 8 mm armor plating on the bridge, gun turrets, and magazines. The primary battery consisted of three single dual-purpose guns managed by a Yakor fire control director and remote power control. Initial operations were marked by reliability issues involving the steam turbines and boilers. A modernization program, designated Project 50 A, was implemented in the late 1950s and early 1960s. These updates included the installation of RBU-2500 anti-submarine rocket launchers, upgraded radar, and the addition of permanent ballast to increase stability.

The Soviet Navy operated the majority of the class, with most units decommissioned by 1980. Because of their size and multi-purpose capabilities, the vessels were utilized by several export customers to fill roles typically held by destroyers or minesweepers. The Indonesian Navy acquired eight ships between 1962 and 1964, and the East German Volksmarine operated four units. The Finnish Navy acquired two vessels in 1964, and the Bulgarian Navy operated three ships between 1957 and 1990. China assembled four ships from Soviet-supplied kits as the Chengdu class (Type 6601/01) and later produced five reverse-engineered units designated as the Jiangnan class (Type 065). One vessel, SKR-72, was abandoned at the mouth of the Iokanga River, where the wreck remained visible as of 2022.