Stenka - class patrol boat The Stenka class is the NATO reporting name for a class of patrol boat s built for the Soviet Navy and Soviet Allies . The Soviet designation was Project 205P Tarantul ( not to be confused with the Tarantul class corvette ) . The boats are an anti - submarine patrol boat version of the Osa class missile boat Design . Project 205P Stenka is a variant of the Project 205 Osa missile boat . The Stenka used the hull of the Osa class and had a slightly larger crew . The development office of the " Alma " Shipyard in Leningrad used the standardized components of the Osa missile fast patrol boat , in order to develop an anti submarine boat . The anti ship missile launch containers were replaced by four torpedo tubes but the anti - ship missile related structures and equipment were retained . The living spaces in the Stenka were improved for long patrol endurance by raising the superstructure in order to create more usable space inside , compared to the Project 205 Osa missile boat . They also installed a more powerful air conditioner . The drive system is three diesel radial engines of the type M504 B2 with a total capacity of 15 , 000 hp . Armament . The primary ASW weapon for combating submarines were SET - 40 torpedoes . The boats has four 406 - mm torpedo tubes installed on the deck in the aft part of the boats , two on the port side and two on starboard side . Behind the torpedo tubes on the aft deck , in the port and starboard sides , are each one Abrollgestell depth charge launcher . Twelve depth charges , six for each launcher can be carried . As the boats of the Project 205 Osa class , the Project 205P Stenka boats has two radar - controlled AK - 230 30 - mm twin guns , one in the bow , the other at the rear . One of the boats was tested with a 57 - mm gun AK - 725 on the bow and received a modified project number - 205PE . Sensors . To search for air and surface contacts with a 205P project is MR - 102 - ( NATO : " Pot Drum " ) or a " positive " - Radar ( NATO : " Peel Cone " ) provided that are installed on the mast . Including two antennas on the mast of the system to be friend or foe identification attached , which NATO described as " High Pole B " . For directing the fire of two guns AK - 230 - Towers is a fire control radar of the type MR - 104 , which was christened by NATO ' Drum Tilt " , mounted on the rear of the building . The search for submarines , the ships with an MG - 345 " Bronza " system fitted , which consists of a submersible sonar - type MG - 329 " Sheksna " as well as the corvettes of Project 133 . 1 bear , and a MG - 11 - " Tamir - 11 " sonar sensor composed of the fuselage . Ships . Soviet Navy . A total of 114 or 117 ( sources vary ) boats were built between 1967 and 1990 . They were operated by the Maritime Border Guard The Soviet Union classified the boats of their border troops as " border guard ships " ( Russian Пограничные сторожевые корабли ( ПСКР ) ) and the five boats of the Navy as a gunboat ( Russian артиллерийский катер ) . A similar allocation of boats for submarine control are designed into the regular border security , which in the NATO countries is rather unusual , so that project there as 205P patrol boat is kept .