Pohjanmaa class [REVIEW + SPECS] | Defence Database
Pohjanmaa-class corvette
Posted by: Andrei Dcs

Pohjanmaa-class is a class of Finnish-designed corveetes developed for the Finnish Navy.

Four Pohjanmaa-class are to be built under the Squadron 2020 (Finnish: Laivue 2020) project.

Pohjanmaa class corvettes will become the largest surface combatants of the Finnish Navy supplementing the four Hamina-class missile boats.

Once in commission, the four new Finnish corvettes will replace the four Rauma-class missile boats, two Hämeenmaa-class minelayers, and the Pohjanmaa minelayer, all of which will be decommissioned.

All the four Pohjanmaa corvettes will be locally-built by Rauma Marine Constructions between 2022 and 2025.

The ships are planned to be commissioned in 2028.

Author: Finnish Ministry of Defense - defmin.fi
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Program cost and unit cost of the Pohjanmaa corvettes

The cost for building all the four Pohjanmaa corvettes is estimated at 1.3 billion euro.

Thus each Pohjanmaa corvette will have a unit cost of 326 million euro.

Displacement and dimensions of the Pohjanmaa class corvette

The Pohjanmaa class corvette has a displacement of approximatelly 3,900 tons.

The new generation of Finnish surface combatants measures 114 m (374 ft) in lenght, has a beam of 16 meters (52 ft) and a draught of 5 meters (16 ft).

Regarding its displacement and dimensions, Pohjanmaa can be classified as a heavy corvette or a light frigate.

Propulsion of the Pohjanmaa corvettes

Pohjanmaa class uses a combined diesel-electric and gas (CODLAG) type propulsion with a total installed power of about 30 MW.

It is powered by one GE LM2500 gas turbine and four MAN 12V175D generating sets, each MAN 12V175D generator having a power of 1,920 kW.

The Pohjanmaa corvette also has two shafts with controllable pitch propellers and two bow thrusters.

Pohjanmaa class corvette speed and range

Pohjanmaa can reach a maximum speed of over 26 knots (48 km/h; 30 mph) and has a maximum range of about 3,500 nautical miles (6,500 km; 4,000 mi).

Pohjanmaa class complement

The complement of each Pohjanmaa unit will be made up of approximately 70 persons.

Sensors and processing systems installed aboard the Pohjanmaa corvettes

Pohjanmaa-class corvettes will be equipped with state-of-the-art sensors and processing systems provided by Saab and Kongsberg.

The combat management system (CMS) will be the Saab 9LV CMS.

Saab will also provide the radars, including a Saab Sea Giraffe 4A FF 3D AESA radar, a Saab Sea Giraffe 1X short-range 3D radar, and two Saab Ceros 200 radar and optronic tracking fire control directors.

Three sonars will be fitted onboard the Pohjanmaa corvettes: a dual-tow Patria Sonac DTS sonar, a Kongsberg SS2030 hull-mounted sonar, and a Kongsberg SD9500 sonar.

Electronic Warfare Systems and decoys of the Pohjanmaa class

The electronic warfare systems and the decoys used by Pohjanmaa include ESM, COM-ESM, ECM and four MASS decoy systems.

Armament of the Pohjanmaa class corvettes

The future Finnish Pohjanmaa-class corvettes will be fitted with various weapons including guns, anti-ship and surface-to-air missiles, as well as mines and torpedoes.

Onboard guns will be a 57 mm/70 Bofors SAK Mk3 naval gun and two Saab Trackfire remote weapon stations (RWS).

The anti-ship capability will be provided by Gabriel 5 surface-to-surface anti-ship missiles.

For aerial warfare, Pohjanmaa will have 32 Evolved Sea Sparrow surface-to-air missiles.

Naval mines and Saab Torped 47 anti-submarine torpedoes completes the range of weapons installed onboard.

Aviation facilities of the Pohjanmaa class

Like any other modern corvette, Pohjanmaa will have a helipad and a hangar to be able to operate onboard a medium utility helicopter.

Pohjanmaa-class corvette - General Data and Specifications:
Type Corvette
Service Period and Status 2028 (planned)
Manufacturer and Builders Rauma Marine Constructions
Program & Unit Cost Program cost:
1.3 billion euro (estimate)

Unit cost:
325 million euro (estimate)
Production Period 2022-2025 (planned)
Number Built On order: 4
Preceded by Rauma class
Hämeenmaa class
Mass / Weight About 3,900 tons
Length 114 m (374 ft 0 in)
Width 16 m (52 ft 6 in)
Draft 5 m (16 ft 5 in)
crew About 70
Speed Over 26 knots (48 km/h; 30 mph)
Operational Range About 3,500 nmi (6,500 km; 4,000 mi)
Armament Naval gun:
1 × Bofors 57 mm/70 SAK Mk3 gun

Remote Weapon Stations (RWS):
2 × Saab Trackfire RWS

Anti-ship missiles:
8 x Gabriel V surface-to-surface missiles

Surface-to-air missiles:
32 × Evolved Sea Sparrow surface-to-air missiles

Saab Torped 47 ASW torpedoes

Naval mines
Propulsion Combined diesel-electric and gas (CODLAG); about 30 MW (40,000 hp) in total
1 × GE LM2500 gas turbine
4 × MAN 12V175D generating sets (4 × 1,920 kW)
Two shafts; controllable pitch propellers
Two bow thrusters
Sensors & Processing Systems Saab 9LV combat management system (CMS)
Saab Sea Giraffe 4A FF AESA 3D radar
Saab Sea Giraffe 1X short-range 3D radar
2 × Saab Ceros 200 radar and optronic tracking fire control directors
Dual-tow Patria Sonac DTS sonar
Kongsberg SS2030 hull-mounted sonar
Kongsberg SD9500 sonar
Electronic Warfare & Decoys ESM
4 × MASS decoy systems
Avioation Facilities Helideck and hangar