Iver Huitfeldt-class frigates – Demark

The Ivar Huitfeldt Class frigates are being built by Odense Steel Shipyard for the Royal Danish Navy. Three frigates are scheduled to enter service between 2012 and 2013. The class is preceded by Niels Juel corvette. It is the navy’s largest acquisition project to date.

The keel for the first ship in the class, Iver Huitfeldt (F 361), was laid in June 2008 and launched in March 2010. The frigate was transferred to the Defence Acquisition and Logistics Organisation (FMT) in January 2011 for testing. It is expected to enter operational service in 2012. The second frigate, Peter Willemoes (F362), was laid in March 2009 and launched in December 2010. The third and final ship, Niels Juel (F363), was laid in December 2009.

Ivar Huitfeldt design

The seven-deck monohull design features 15 watertight sections. It has been designed to reduce radar signature, infrared radiation, underwater noise and magnetic signature to make the ship as invisible as possible to an enemy.

The Iver Huitfeldt Class design is an evolution of the Absalon Class developed by the navy and Odense Steel Shipyard (OSS).

The exterior is easily distinguished from Absalon Class as the Iver Huitfeldt is one deck lower, and lacks an internal multipurpose deck (flex deck). The chimney’s design has been changed to prevent excessive steam impact of SMART-L radar.


The design protects the crew from contamination. The frigate is divided into six hazard zones. All the zones are equipped with separate filters to protect the crew against chemical, radioactive or biological weapon attacks and airlocks are provided between them.

Frigate construction

The frigates are being constructed simultaneously in the same dock in a phased manner.

The first phase includes assembly of all welded steel blocks into a ship platform, while civil equipment is installed by the shipyard and its subcontractors in the second phase.

Following delivery from the shipyard, the frigates will sail to Naval Station Korsor where military installation work will take place in the final phase.

Command and control

The spacious bridge spans the full width of the ship. Bridge 

The frigates will be equipped with the Terma C-flex command and control system. The C-flex system integrates Commercial, off-the-shelf (COTS) units including a server, a console computer, an interface computer, a LAN switch and an UPS unit in an environmentally protected 19” rack. It is based on the T-Core open architecture platform.

The C-flex receives information from ship board sensors and distributes the data to weapon systems after evaluation. The computer creates an electronic image of the real-time situation around the frigate.

The helmsman sits at a raised console in the center of the pilothouse, steering with a joystick.

The frigate can exchange information with other units based at sea, air or land. The communications are conveyed through data links and other computer networks.

Terma to Support Royal Danish Navy Iver Huitfeldt Class Frigate BMD & IAMD Upgrade – 13 April 2016 – navyrecognition

The Danish Defence Acquisition and Logistics Organization (DALO) has entered into an agreement and signed a contract with Terma on Integrated Air and Missile Defense (IAMD). The aim is to provide DALO with study and advisory support within the Ballistic Missile Defense (BMD) and IAMD domains related to the Danish government’s decision to upgrade at least one of the IVER HUITFELDT class frigates to a BMD sensor role and offer this capability to the NATO BMD system.  @navyrecognition

Weapon Systems

The frigate will be fitted with Lockheed Martin mk41 multimissile vertical launch system (VLS) for the evolved Sea Sparrow missile (ESSM) and SM-2 IIIA missile.

The missile bay amidships is fitted with three different types of launchers. At center is a new 32-cell Mark 41 Vertical Launch System from Lockheed Martin, able to handle Standard SM-2 and SM-6 missiles. The weapons have yet to be purchased, however, and the system is not yet operational. Flanking the Mark 41 are two Raytheon Mark 56 missile launchers to handle Evolved Sea Sparrow missiles (ESSM) anti-air missiles. Just visible in the foreground are the support structures for Boeing Harpoon surface-to-surface missiles. Both the Mark 56 and Harpoon launchers come from decommissioned ships. None of these launchers are yet operational, but the ship plans to fire both ESSM and Harpoon missiles in Spring 2015 to certify the systems. Lockheed Martin mk41 multimissile vertical launch system (VLS) for the evolved Sea Sparrow missile (ESSM) and SM-2 IIIA missile Sea Sparrow missile (ESSM) The Sea Sparrow SAM is equipped with an improved semi-active radar homing guidance system in an 8in diameter forebody guidance section. The guidance system uses inertial / command mid-course continuous wave radar or interrupted continuous wave radar illumination-data. Both X-band and S-band data links are used to transmit the information to the combat systems. The Sea Sparraw SAM provides increased performance against smaller targets. The propulsion system provides the missile with a speed of over Mach 4 and a range of more than 50km. (naval-technology.com)SM-2 IIIA missile  The Block III missiles differ from earlier blocks by the addition of the MK 45 MOD 9 target detecting device, for improved performance against low altitude targets. The Block IIIB missile additionally has a dual semi-active/infrared seeker for terminal homing. The dual seeker is intended for use in high-ECM environments, against targets over the horizon or with a small radar cross section. 40 to 90 nmi (74 to 167 km) > 24,400 m (80,100 ft) Mach 3.5Boeing Harpoon block II anti-ship missile system

The missile is equipped with an insensitive munitions (IM)-compliant, an nular blast fragmentation warhead, weighing 40.5kg, and offers high lethality against anti-ship missiles.

Eurotorp MU90 lightweight torpedo
The mk41 system can fire anti-air, anti-submarine and anti-ship missiles. Ivar Huitfeldt will also be armed with the Boeing Harpoon block II anti-ship missile system and the Eurotorp MU90 lightweight torpedo fired from a twin or triple torpedo launcher.

The frigate’s main gun will be an Oto Melara 76mm Super Rapid gun. The Oerlikon Millennium 35mm naval gun system will onboard provide close-in air defence. It is based on the new Oerlikon 35mm revolver cannon land-based air defence system. A 12.7mm machine gun will also be available aboard the ship.

Two Italian-made 76mm Oto Melara guns are fitted forward -- unusually for post-World War II ships, in a super-firing arrangement (one over the other). The guns are reconditioned units from decommissioned patrol ships. The base ring for the forward mount is sized to take a US-built Mark 45 five-inch gun, but funding for the mount -- at about $50 million each -- has yet to be approved. Eventually, the Danish Navy hopes to install another close-in weapon system in the No. 2 position. Oto Melara 76mm Super Rapid gunThe ready-ammunition magazine for one of the 76mm gun mounts. Variants of the lightweight Oto Melara are one of the most popular gun mounts in the world, in no small part because of their minimal impact on ship designs. The revolving ready-ammunition magazine for one of the 76mm gun mounts.Oerlikon Millennium 35mm naval gun system will onboard provide close-in air defence based on the new Oerlikon 35mm revolver cannon land-based air defence systemA 12.7mm machine gun

Sensors and radars

Closer view of the Smart-L radar. A Rheinmetall Oerlikon 35mm Millenium close-in weapon system is to be installed atop the hangar. The Swiss-manufactured weapon is in service with the Danish and Venezuelan navies. SMART-L long-range surveillance radarAPAR multifunction radarFuruno navigation radar

The sensor suite will include the SMART-L long-range surveillance radar, the APAR multifunction radar, Furuno navigation radar and ATLAS ASO 94 hull-mounted sonar. The SMART-L operating on L band will provide very long range surveillance.

FLIR system Seastar Seafire IIISaab CEROS 200 fire control radars

Other subsystems will include ATLAS ASO 94 hull mounted sonar, FLIR system Seastar Seafire III, Saab CEROS 200 fire control radars and EDO 3701 electronic warning and assessment system.

EDO 3701 electronic warning and assessment system. (defense-studies.blogspot.com)


The large flight deck is limited to aircraft of 20,000 pounds -- big enough for EH-101 and NH-90 helicopters. The flight control station is at left.

The Iver Huitfeldt frigate will feature a helicopter deck and hangar to support the operations of medium-sized helicopters such as the AW101. The deck can also handle larger and heavier helicopters of up to 20t.



The frigate will be fitted with 12-barrelled Terma DL-12T 130mm decoy launchers. Terma SKWS (soft kill weapon system) is a modern decoy-launching system that can fire SeaGnat decoys. The Terma launcher provides 360° coverage against incoming anti-ship missiles.

12-barrelled Terma DL-12T 130mm decoy launchers SeaGnat decoys


The Ivar Huitfeldt Class will have a crew 101 divided into four divisions:

  • surgical division of 32 (eight officers, three sergeants and 21 privates)
  • weapons division of 17 (two officers, three sergeants and 12 privates)
  • engineering division of 32 (six officers, three sergeants and 23 privates)
  • management division of 20 (two officers, four sergeants and 14 privates).
Electro Officer Christian Jens, in the foreground at left, oversees operations in the ship's Engineering Control center. With a crew of only 117, the Nils Juel relies on a high degree of automation. Fifty cameras monitor key spaces around the ship -- at right, one of them shows a view of the helicopter hangar.Engineering Control center

Each frigate will have berths for 165 people, hence small staff, helicopter crew, doctors, students and trainees are accommodated.


The frigate will be powered by four main MTU 20V 8000 M70 diesel engines, placed two and two each, in a combined diesel and diesel configuration. The propulsion system will provide a speed of over 28kt.

One of the ship's four MTU 20V M70 diesels. Together, they provide 32.8 megawatts to drive the ship's two propeller shafts. Another view of the forward machinery room. These spaces, along with most of the ship's lower hull, were designed primarily by Maersk, the huge Danish shipping firm. Use of commercial features combined with military requirements was key to keeping construction costs down.

The ship will be equipped with two Becker rudders and a bow thruster with an output of 900kW. A set of active stabilisers will provide stability to the frigate. Four generating sets comprising two Caterpillar engines and Leroy-Somer generators will be provided. Each pair will include a CAT3512 and CAT3508 generating 1,360kW and 920kW respectively.

Sailors hoist in one of the ship's two rigid-hull inflatable boats (RHIBs). Only three sailors are needed to handle the operation.

Source: naval-technology.com/intercepts.defensenews.com/from the net

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