Skjold-class corvette

	P965 KNM Gnist
Class overview
Name	Skjold class
Builders	Umoe Mandal, Mandal, Norway
Operators	Royal Norwegian Navy
Preceded by	Hauk class
In commission	1999–present
Planned	6
Active	6
General characteristics
Type	Coastal corvette
Displacement	274 tonnes full load[1]
Length	47.50 m (155.8 ft); 44.3 m (145 ft) (Length on cushion);
Beam	13.5 m (44 ft)
Draught	1.0 m (3.3 ft)
Propulsion	Renk COGAG; 2 × Pratt & Whitney ST18M plus; 2 × Pratt & Whitney ST40M gas turbines; →12,170 kilowatts[2];
Speed	In sea state 3: 45 knots (83 km/h)[3]; In sea state 5: >25 knots (46 km/h)[3]; In calm sea: >55 knots (102 km/h) [4];
Range	800 nmi (1,500 km) at 40 knots (74 km/h)[1]
Complement	15–16
Sensors and ; processing systems	Thales MRR-3D-NG air/surface radar; Terma Scanter 6000 ; Saab Ceros 200 FC; CS-3701 electronic warfare suite; Sagem Vigy 20 electro-optical sensor;
Armament	8 × Kongsberg Naval Strike Missile SSMs, kept in an internal weapons bay; 1 × 76mm Otobreda Super Rapid multi-role cannon; 2 × 12.7mm Browning M2HB HMGs; Portable SIMBAD version Mistral SAMs; Protector (RWS) (Sea Protector);
Notes	Soft kill: TKWA/MASS; Other: Link 11 and Link 16;

Skjold-class corvettes (skjold means "shield" in Norwegian) are a class of six light, superfast, stealth missile corvettes in service with the Royal Norwegian Navy. The boats were formerly classed as MTBs (motor torpedo boats) but, from 2009, the Royal Norwegian Navy has described them as corvettes (korvett) because their seaworthiness is seen as comparable to corvettes, and because they do not carry torpedoes. They were built at the Umoe Mandal yard. With a maximum speed of 55 knots (102 km/h), the Skjold-class corvettes were the fastest combat ships afloat at the time of their introduction.[5]

Development and production

The Skjold-class vessels began with the development of the Royal Norwegian Navy's "Project SMP 6081", and the first preproduction version was ordered on 30 August 1996. The first ship of its class, P960, was launched on 22 September 1998 and commissioned 17 April 1999. A Norwegian Parliamentary White Paper of 2001 recommended building five additional boats, and this was agreed to in 2002. Six Skjold-class vessels replaced the Royal Norwegian Navy's previous fourteen Hauk-class patrol boats.

Design

The Skjold design is a surface effect craft, constructed of glass fibre/carbon composite materials. Buoyancy is augmented underway by a fan-blown skirted compartment between the two rigid catamaran-type hulls. This provides an alternative solution to the planing hull/vee hull compromise: the air cushion reduces wave slam at high speeds while presenting a low-drag flat planing profile at the waterline.

To ensure stealth capabilities, anechoic coatings of radar absorbent materials (RAM) have been used in the load-bearing structures over large areas of the ship. This strategy leads to significant weight saving compared to the conventional construction technique of applying RAM cladding to the external surfaces. The ship's profile has a faceted appearance with no right angle structures and few orientations of reflective panels. Doors and hatches are flush with the surfaces and the windows are flush without visible coaming (edge of window aperture) and are fitted with radar reflective screens. The vessels are additionally protected by the Rheinmetall MASS sensor / decoy system.

Royal Norwegian Navy corvette Storm.

The final design was changed compared to the prototype Skjold, which itself was rebuilt to the new specifications. Most notably, the vessels use 4 gas turbines combined by Renk COGAG gear units built in a lightweight design. The smaller gas turbines rated 2,000 kW turbines are used for cruising speed. For sprint speed a second, larger gas turbine is combined providing a total of 6,000 kW to the waterjet on each shaft line. Two MTU 123 cruise diesel propulsion units used previously at loiter speeds were removed. The foredeck was strengthened to accommodate the addition of a 76 mm Otobreda Super Rapid gun.

Port side view of Royal Norwegian Navy corvette Skjold.

The hull material was produced by a different method to improve strength and minimize vulnerability to fire. The bridge saw some changes, including an upgrade to six weapon systems control consoles.

In 2020, the Norwegian Government decided to further upgrade the Skjold-class vessels, partially to compensate for the loss of the frigate Helge Ingstad. The upgrades would take place between 2020 and 2024, permitting the Skjold-class to remain up-to-date through to 2030 when replacement vessels were envisaged under terms of the government's defence plan.[6]

US Navy

Skjold-class corvettes in harbour at Umoe Mandal shipyard, Norway.

Royal Norwegian Navy corvette Skjold on its American tour, view from astern.

The U.S. Navy and Coast Guard expressed interest in the design and leased the P960 for a period of one year, from 2001 until 2002. During that time it was operated by a 14-person Norwegian crew out of Naval Amphibious Base Little Creek.

Vessels

*Skjold* class – significant dates
#	Name	Laid down	Launched	Commissioned	Notes
P960	Skjold	4 August 1997	22 September 1998	17 April 1999	Name means Shield in Norwegian
P961	Storm	October 2005	1 November 2006	9 September 2010	Name means Storm in Norwegian
P962	Skudd	March 2006	30 April 2007	28 October 2010	Name means Shot in Norwegian
P963	Steil	October 2006	15 January 2008	30 June 2011	Name means Unyielding in Norwegian
P964	Glimt	May 2007		March 2012	Name means Flash in Norwegian
P965	Gnist	December 2007		November 2012	Name means Spark in Norwegian

References

"US Navy Introduces Set-based Design" (PDF). SINTEF. 21 May 2014. Retrieved 15 June 2017.
"Norway - Skjold Class Fast Attack Craft (FAC)". Archived from the original on 25 December 2012. Retrieved 10 August 2022.
"The Skjold Class Fast Reaction Craft" (PDF). Umoe Mandal. 2000. Archived from the original (PDF) on 21 December 2008.
"Skjold Class Missile Fast Patrol Boats, Norway". 2012.
Lundquist, Edward H. "Skjold-class Surface Effect Ship HNoMS Steil". Defense Media Network. Retrieved 6 December 2016.
"Norwegian Defense Ministry accelerates investment plans for corvettes, R&D".

Saunders, Stephen "Jane's Fighting Ships 2003–2004" ISBN 0-7106-2546-4.

External links

Leo Lazauskas (2008) Performance characteristics of a 260t displacement SES. Dept. Applied Mathematics Report, The University of Adelaide, 19 February 2008.
Norwegian Skjold class corvettes storm and steil in Plymouth Sound. 9 July 2015.

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[sintef-1] "US Navy Introduces Set-based Design" (PDF). SINTEF. 21 May 2014. Retrieved 15 June 2017.

[2] "Norway - Skjold Class Fast Attack Craft (FAC)". Archived from the original on 25 December 2012. Retrieved 10 August 2022.

[foils-3] "The Skjold Class Fast Reaction Craft" (PDF). Umoe Mandal. 2000. Archived from the original (PDF) on 21 December 2008.

[4] "Skjold Class Missile Fast Patrol Boats, Norway". 2012.

[5] Lundquist, Edward H. "Skjold-class Surface Effect Ship HNoMS Steil". Defense Media Network. Retrieved 6 December 2016.

[6] "Norwegian Defense Ministry accelerates investment plans for corvettes, R&D".

[Navy-7] In English, the Royal Norwegian Navy is the larger military branch that includes both the Coast Guard and the Navy Fleet. However, in Norwegian, the larger branch is called the Sea Defence, and the term Navy refers to the Navy Fleet.

[ELINT-8] Unarmed intelligence vessels. The Norwegian Intelligence Service is not a part of the Royal Norwegian Navy, but they both answer to the Chief of Defence.