Parchim - class corvette The " Parchim " class corvette ( Soviet designation " Project 133 " ) was developed for the East German Navy in the late 1970s , and built by the Wolgast Peene - Werft . The ships were designed for coastal anti - submarine warfare . In case of an all - out NATO - Warsaw Pact war in Europe their prime targets would have been the small U - 206 coastal submarines of the West German navy . The first ship , the " Wismar " ( now the Indonesian " Sutanto " ) , was launched on 9 April 1981 in Rostock , and subsequently another 15 ships were built until 1986 . To make production more economical , the Soviet Union agreed to purchase another 12 ships from Wolgaster Peenewerft built between 1986 and 1990 , thereby effectively subsidising the East German shipbuilding industry . The ships of the Red Navy were named " Parchim II " by NATO . Though useful as a coastal ASW platform , the Soviet production of the similar but far more powerful " Grisha " class made this purchase even more illogical for the Red Navy . After German re - unification the former East German ships were sold to the Indonesian Navy in 1993 . The Indonesian Navy extensively refurbished their " Parchim " s , to the point where the refurbishing exceeded the cost of purchase . They are still in service , both in the Indonesian Navy and in the Russian Baltic Fleet . Construction . The " Parchim " s were built to replace the obsolete " HAI III " class subhunters of the Volksmarine . Because of their displacement , over 800 tons in full load , they were able to leave coastal waters , even in rough weather . Propulsion consisted of 3 Soviet designed M 504 56 cylinder Diesel engines , a development of the M 503 A fast attack craft engine . The middle engine provided power to a variable pitch propeller for cruising speed , while the two outer engines served two outer fixed pitch propellers for boost speed . Total power output was 14250 hp . The ship was constructed with regular ( stainless ) steel and consisted of ten waterproof compartments . Weapon systems and sensors . Air defence . For air defence , the ships were equipped with one double - barrel AK - 230 30 mm gun and one double - barrel AK - 725 57 mm gun . The Ak - 725 double 57 mm AA gun , designed in 1959 , was directed by the ESP - 72 fire control system , which received ranging and target bearing information from an MR 103 ( NATO codename ' MUFF COP ' ) radar . The MR 103 had a 1 . 3 m parabolic radar dish , with an optical camera system slaved to it , as a backup system in case of failure or heavy EW environment . The barrels of the gun were water - cooled and belt - fed , with each belt containing 550 rounds , but the first round had to be manually chambered . In an emergency , the turret could be manually operated with an optical fire control system . The MR 103 radar system , already outdated when the " Parchim " s were developed , used 1950s - style electromechanical systems , built around vacuum tube s . As a result , it wasn ' t considered to be an effective anti - missile system , or CIWS ( Close - in weapon system ) , as was evidenced by a Soviet training accident in 1987 when a test missile drone accidentally locked in on a small Red Navy training vessel . Although the ship ' s AK - 725 system kept firing until the moment of impact , no hits were scored and the ship was destroyed by the resulting fire , allegedly killing 39 crew members . The AK - 230 gun was a fully automatic , stabilized , NN - 30 double - barrel , water - cooled , four - chamber revolver cannon . The guns had a 1000 round per minute ( rpm ) rate of fire and were fed by independent 500 round ammunition belts . The regular associated radar system was the ( Nato codename ) DRUM TILT radar , which was not used in the " Parchim " class . According to some sources the AK - 230 could not only be linked with the DRUM TILT but also with the MUFF COP radar system , but this is disputed by old East German naval sources . According to these East German sources , the AK - 230 gun on the Parchim class corvette was optically guided , thereby leaving the " Parchim " class without an effective CIWS , and therefore unable to counter anti - shipping missiles . There were also two SA - N - 5 ( Naval SA - 7 or Strela II ) MANPAD positions aboard the " Parchim " s . But without an effective , radar guided SAM missile system , the " Parchim " s were left completely vulnerable to enemy precision guided anti - shipping weapons . This was a major restriction and confined the " Parchim " s to brown water coastal operations , close to the protective air force and air defence umbrella . The air search radar was the ubiquitous ( Nato codename ) STRUT CURVE radar . This radar had a 4 m parabolic radar dish , worked in the F - band frequency , and had a respectable radar range against aircraft flying at 5000 m height , and a less respectable radar range against surface shipping or low flying aircraft . The electronic defense suite was very basic , and consisted of an IFF ( Identification Friend or Foe ) receiver and transmitter , and an ' ELOKA ' multiband passive RWR antenna slaved to a double 16 - cell chaff dispenser . All in all , air defence - or the lack of one - was a very restrictive factor in the tactical usefulness of the " Parchim " design . Anti - submarine warfare . A major evolution over the old " HAI III " design was the new hydro - acoustic system . The sonar suite consisted of a bow sonar and a variable depth dipping sonar . The sonarscreen was panoramic , meaning that it gave a two dimensional radarscope - like view of the surrounding waters . This was a major improvement over the old auditive system in the " HAI III " class . Another weakness of the old " HAI III " was its inability to ' see through ' water layers with different temperatures . While sound propagates pretty well in water of the same temperature , it gets easily disturbed by even modest differences in water temperature . Especially in the hot summer months these natural occurring phenomena give submarines an easy hide out for probable subchasing surface vessels . A solution is the use of a ' dipping sonar ' , which in a way is nothing more than a small sonar attached to a long cable . By using this device the " Parchim " s sonar system was able to search the different water layers . The " Parchim " s were also provided with capable anti - submarine warfare weapons . The 400 mm torpedo tubes were loaded with acoustical and / or wire guided torpedoes . This gave the " Parchim " s a precision submarine strike capability . The two RBU - 6000 depth charge rocket launchers created a barrier defense against submarines , incoming torpedoes and frogmen . Though relatively unsophisticated by western standards , the RBU - 6000 was a very successful and popular system , used on many small or large surface ships . It consisted of a twelve launch tubes for unguided rockets , armed with a compact but powerful depth charge . Rockets were directed by simply changing the angle of the tubes and thereby the ballistics of the unguided rockets . The launcher could elevate between - 15° and + 60° , and could traverse 180° , with each launcher thus covering one side of the ship . Range was between 350 m and 6000 m , and the charges could reach 500 m deep . The rockets , RGB - 60 ' s , weighed 110 kg of which 25 kg was a high explosive warhead . The ammunition was swiftly and automatically reloaded from a magazine below deck , by turning the tubes 90° vertically . Maximum magazine capacity was 96 rounds . The whole system was remotely directed by the ' Burya ' fire control system . The RBU - 6000 could also be used for shore bombardment2 . The " Parchim " s were also able to simply drop bigger and more powerful depth charges , and could transport and lay up to 60 mines . Overview . All in all , the " Parchim " s were up to their task , namely to hunt and destroy enemy submarines in coastal waters . Because of their lack of any real anti - shipping weapons and more importantly because of the absence of a modern air defence capability , their ' blue water ' ( out of the coastal regions ) value would indeed have been slight . This shortcoming was partially offset by Volksmarine doctrine , which regarded the " Koni " class frigates , equipped with the radar guided OSA / SA - N - 4 SAM ' s , as the cornerstone of their naval blue water air defence . In other words , in order to survive a modern naval war , they had to be escorted by radar guided SAM carriers . But , as the biggest GDR warship building project in history , the " Parchim " class truly was the " Höhepunkt des DDR - Kampfschiffbaus " . Indonesian service . The 16 x " Parchim " s from the GDR were purchased by Indonesia in 1992 in a deal worth US $ 12 . 7 million arranged by then Vice President , Dr B . J Habibie . The transfer from the Volksmarine also included , 14 x Frosch class landing ships and 9 x Kondor class minesweepers . The " Parchim " s , now known as the Kapitan Patimura class underwent a significant rehabilitation which included air - conditioning and engine replacements . The ships were " Kapitan Patimura " ( 371 ) , " Untung Suropati " ( 372 ) , " Nuku " ( 373 ) , " Lambung Mangkurat " ( 374 ) , " Cut Nyak Din " ( 375 ) , " Sultan Thala Syafuddin " ( 376 ) , " Sutanto " ( 377 ) , " Sutedi Senoputra " ( 378 ) , " Wiratno " ( 379 ) , " Memet Sastrawiria " ( 380 ) , " Tjiptadi " ( 381 ) , " Hasan Basri " ( 382 ) , " Iman Bonjol " ( 383 ) , " Pati Unus " ( 384 ) , " Teuku Umar " ( 385 ) , and " Silas Papare " ( 386 ) .