The frigate ARG GUSAR (G121) was built at Pribaltiyskiy Shipyard Yantar at Kaliningrad for the Soviet Navy as one of Project 159A.
The Petya class was the NATO reporting name for a class of light frigates designed in the 1950s and built for the Soviet Navy in the 1960s. The Soviet designation was “Storozhevoi Korabl” Project 159.
The ships had a length of 81.8 m (Petya-I-Klasse and Petya-I-Mod) or 82.5 m (Petya-II-Klasse and Petya-II-Mod). The width of all variants was 9.1 m. All ships also had a draft of 2.9 m. The water displacement was therefore only slightly changed.
For the ships of the Petya-I-Class and Petya-I-Mod, it was 950 t standard and 1150 t fully loaded. On the ships of the Petya II class and Petya II Mod 950 t standard and 1160 t fully loaded.
All variants of the Petya class were driven by a CODAG system. It consisted of a diesel engine with approx. 6,000 HP and two gas turbines with 30,000 HP. The ships reached a maximum speed of over 30 knots. The maximum range at an ideal speed of 10 knots was approximately 4,870 nautical miles.