ORP Czajka is a Polish base minesweeper from the Cold War era, one of a series of 12 vessels of Orlik-class, converted between 1998 and 1999 to a minehunter of Projekt 206FM. The unit measured 58.2 meters in length, 7.97 meters in width, and had a draft of 2.14 meters, with a full displacement of 470 tons. It was armed with three double sets of 25 mm 2M-3M autocannons and depth charges, and was also adapted for transporting and deploying naval mines.
It was launched on 17 December 1966 at Stocznia Gdynia, and it was commissioned into the Polish Navy on 23 June 1967. The heavily utilized unit, designated with the pennant number 624, initially served in the 13th Minesweeper Division of the in Hel, and after its dissolution in 2006, it was assigned to the 8th Coastal Defence Flotilla. ORP Czajka was part of the NATO mine countermeasures task forces four times and participated in numerous international maneuvers and exercises, clearing dangerous remnants of World War II from Polish and foreign waters. The ship was decommissioned in December 2021.
Design and construction
Work on a new type of minesweeper began at the Central Ship Design Bureau No. 2 in Gdańsk in 1958 to replace the minesweepers, which had been in service since 1946. Initially, the new vessels were intended to be roadstead minesweepers, capable of conducting both contact and non-contact mine clearance operations in the vicinity of naval bases and laying small minefields. These ships were to have a displacement of approximately 200 tons, a speed of 18 knots, a range of 3,000 nautical miles, and armament consisting of two 45 mm guns and four 14.5 mm heavy machine guns, with mine clearance equipment standard for the late 1950s. Simultaneously, the Navy Command issued requirements for a new base minesweeper with a displacement of 570 tons, despite ongoing preparations for the licensed production of Soviet T43-class minesweepers. Under the leadership of engineer Henryk Andrzejewski, Central Ship Design Bureau No. 2 prepared both the design for a roadstead minesweeper (designated Projekt 206) and four designs for larger base minesweepers (Projekts 250–253). After much debate, it was decided to halt work on the Projekt 250–253 base minesweepers in favor of converting the Projekt 206 vessel into a base minesweeper. In 1959, Central Ship Design Bureau No. 2 developed a modified minesweeper design with a displacement of 425 tons, powered by Italian Fiat diesel engines, as no suitable propulsion units were being produced in socialist countries.Initially, it was planned to use Dutch RHUB 215 diesel engines with a power of 1,500 hp to power the minesweepers; however, a license could not be obtained for them (similarly to the Fiat engines, of which 24 units were ultimately purchased for a total of 2.4 million USD) (). The project (designated B206F)The letter F in the project designation likely symbolizes the Fiat engines used to power the minesweepers (). was approved for implementation in December 1959 by the Minister of National Defense, but the final technical design was not approved by the Navy Command until 19 February 1962. The documentation costs amounted to 1.7 million PLN, the construction of the prototype (the future ) cost 80 million PLN, and the cost of a serial ship was 65.5 million PLN. The unit's annual operational limit was set at 700 hours, with the structure's lifespan estimated at 20 years.
ORP Czajka was built at Stocznia Gdynia (yard number 206F/12). Military oversight of the construction was carried out by Lieutenant Commander . The shipyard used a method of building the vessel's hull from sections joined on the slipway, a technique previously developed for the mass production of fishing trawlers. The keel of the ship was laid on 12 September 1966, and it was launched on 17 December 1966. The minesweeper was given the traditional name for Polish mine warfare vessels, taken from a bird. The ship's godmother was the wife of one of the builders, Kazimiera Prządak.
Tactical and technical data The ship was a smooth-deck, ocean-going minesweeper designed for operation in conditions of partial ice cover. The overall length was 58.2 meters, width was 7.97 meters, and draft was 2.14 meters. The side height measured 4 meters. Constructed from steel, the vessel's fully welded hull was reinforced to increase resistance to underwater explosions. It was divided into seven watertight compartments: (from the bow): I – forecastle (bosun's store, ship's equipment store, food store, chain locker, and anchor windlass), II – radar station and ammunition and electrical storage, III – living quarters and gyrocompass and artillery central room, IV – auxiliary engine room, V – main engine room with propulsion control center, VI – stern crew quarters, and VII – minesweeping equipment store, steering engine, and depth charge chutes. The lowest level of the hull housed fuel tanks, freshwater, and service water tanks, as well as the propeller shafts. On the lower level of the superstructure were the officers' cabins, mess, galley, sanitary facilities, and food storage. The upper part contained the bridge and cabins for radio, navigation, and sonar, along with a command post on the signal deck covered with a tarpaulin roof and a light three-legged mast with radio equipment antennas. The standard displacement was 426 tons, while the full displacement was 470 tons. report a standard displacement of 424 tons and a full displacement of 503 tons, while states that the displacement was 450/483 tons.
The ship was powered by two non-reversible, turbocharged 12-cylinder four-stroke diesel engines in a V configuration, the FIAT 2312SS, each with a maximum power of 1,324 kW (1,800 hp; the nominal power was 1,400 hp at 920 rpm), driving two controllable pitch propellers via Lohman GUB reduction gears. The maximum speed of the vessel was 18.4 knots (economical speed – 17 knots). The ship could carry 55.5 tons of fuel, providing a range of 2,000 nautical miles at a speed of 17 knots. and state that the range was 2,000 nautical miles at a speed of 15 knots, while claims it was 3,200 nautical miles at 12 knots. At the stern, there were two balanced rudders, each with an area of 1.7 m², operated by an MS25 steering gear. Electrical power was supplied by four British main generators, Ruston S324M, each rated at 60 kVA (consisting of a generator and a Leyland SW400 engine with a power of 72 hp at 1,500 rpm), an auxiliary generator S322M rated at 27 kVA, and an electromagnetic minesweeping generator M50. The ship's autonomy was 12 days. It could safely operate in sea state 8, while performing minesweeping tasks in sea state 4, at speeds ranging from 0 to 12 knots.
The ship's initial artillery armament consisted of three twin 2M-3M 25 mm autocannons, with a total ammunition supply of 6,000 rounds. These were positioned with one mount forward of the superstructure along the ship's centerline and two mounts side by side on the aft superstructure. The anti-submarine warfare armament included two below-deck depth charge racks, with a total of 12 B-1 depth charges. Additionally, the ship was equipped with two deck-mounted mine rails, capable of alternately carrying 10 KB or AMD-500 mines, 16 08/39 mines, or 8 AMD-1000 mines. The crew was also armed with individual weapons, including 22 AK-47 rifles and 8 pistols, with a total ammunition stock of 17,000 rounds.
Minesweeping equipment included the MT-2 contact sweep, TEM-52M electromagnetic sweep, and BAT-2 acoustic sweep. The ship's electronic equipment included the Kremnij-2 identification friend or foe system, R-609 VHF radio communication station, R-644 HF transmitter, R-671 HF receiver, R-619 wideband receiver, ARP-50-1,2M direction finder, Tamir-11M (MG-11M) sonar, Lin-M general observation radar, and Rym-K radio navigation system. The ship was also equipped with 8 smoke candle racks, a Kurs-4 gyrocompass, UKPM-1M and UKPM-3M magnetic compasses, a NEŁ-5 echo sounder, MGŁ-25 chip log, and an infrared group navigation system called Chmiel.
The minesweeper was adapted for passive defense against nuclear and chemical threats. For this purpose, three rooms with filtration and ventilation devices were constructed, and dosimetric equipment, as well as decontamination spray pipelines, were installed on the ship. Degaussing equipment further supplemented the vessel's systems.
The ship's crew initially consisted of 49 personnel – 5 officers, 16 non-commissioned officers, and 28 sailors.
Service
Service as a minesweeper (1967–1998)
On 23 June 1967, ORP Czajka was commissioned into the Polish Navy under the order of the Navy Commander No. 033/org. dated June 17 of that year. states that the commissioning took place on 26 june 1967. The vessel, marked with the penannt number 624, joined the 13th Minesweeper Division of the , stationed in Hel. The ship's tasks included searching for and destroying minefields, conducting reconnaissance and control sweeping, marking navigation routes, and guiding vessels or their groups along those routes. Along with its sister ships, Czajka participated in nearly all significant exercises of Polish vessels and the Warsaw Pact fleets, frequently engaging in the disposal of unexploded ordnance from World War II.
In the early 1970s, ORP Czajka belonged to the IV group of the 13th Minesweeper Division (alongside and Mewa). From 1970 to 1974, the vessel participated in mine searching in the area designated for the construction of the Northern Port in Gdańsk. In June 1975, due to the introduction of a new numbering system by the Polish Navy, the vessel's pennant number was changed to 654. In that month, the minesweeper took part in the Polish Navy exercises codenamed Posejdon-75. In mid-1976, the vessel underwent another renumbering, receiving the number 679. It returned to its original designation (624) in mid-1978. On 24 November 1978, Czajka was awarded the title of the best ship of the Polish Navy in its class. In the late 1970s, the vessel was tested multiple times with prototypes of the ZU-23-2M Wróbel artillery system, but in the early 1980s, the minesweeper was equipped with this type of weapon (which was soon removed and replaced with older 2M-3M systems due to high failure rates). In 1985, the ship participated in exercises codenamed Reda-85 and Barakuda-85. In 1987, Czajka took part in mine clearance operations near Świnoujście.
From 6 to 18 June 1995, the unit (alongside its sister ships ORP , Flaming, and Mewa, the submarine Wilk, and the missile ships and ) participated in the NATO naval forces international exercise BALTOPS ’95. From 2 to 14 October 1995, the vessel took part in mine countermeasure exercises organized by the Belgian Navy (alongside the minesweepers Mewa and and the tanker Bałtyk). From 14 to 16 September 1996, ORP Czajka, along with the mine destroyers: Belgian Lobelia and Primula, Dutch Zierikzee, and Polish minesweepers Flaming, Mewa, and , participated in searching for and destroying mines in the shipping lanes of the Gdańsk Bay.
During its long service, the ship's electronic equipment was modernized: the Lin-M radar was replaced with a newer TRN-823, the Kremnij-2 identification friend or foe was replaced with Nichrom-RR, and a second SRN-2061 radar station was added. The outdated Rym-K radionavigation system was also removed and replaced with a more modern Bras system (with the Hals receiver); British Decca Pirs-1M radionavigation receivers were also installed. In the early 1980s, the ship's anti-aircraft armament was enhanced by installing two quadruple Fasta-4M launchers for 9K32 Strela-2 anti-aircraft missiles (with a total of 16 missiles) on both sides of the funnel. Changes also affected the sweeping equipment: the MT-2 contact sweep was upgraded to the MT-2W variant (with explosive cutters), and new Polish electromagnetic sweep TEM-PE-2 and deep-water, high-speed acoustic sweep BGAT were installed.