''Skjold''-class corvettes (skjold means "shield" in Norwegian) are a class of six light, superfast, stealth missile

corvette A corvette is a small warship. It is traditionally the smallest class of vessel considered to be a proper (or " rated") warship. The warship class above the corvette is that of the frigate, while the class below was historically that of the sloo ...

s in service with the

Royal Norwegian Navy The Royal Norwegian Navy () is the branch of the Norwegian Armed Forces responsible for navy, naval operations of Norway, including those of the Norwegian Coast Guard. , the Royal Norwegian Navy consists of approximately 3,700 personnel (9,450 i ...

. 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 Seakeeping ability or seaworthiness is a measure of how well-suited a watercraft is to conditions when underway. A ship or boat which has good seakeeping ability is said to be very seaworthy and is able to operate effectively even in high sea sta ...

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 , the ''Skjold''-class corvettes were the fastest combat ships afloat at the time of their introduction., beaten by the Abu Dhabi MAR WP-18 Interceptor.

Design

The ''Skjold'' design is a surface effect craft, constructed of

glass fibre Glass fiber ( or glass fibre) is a material consisting of numerous extremely fine fibers of glass. Glassmakers throughout history have experimented with glass fibers, but mass manufacture of glass fiber was only made possible with the inventio ...

/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 material In materials science, radiation-absorbent material (RAM) is a material which has been specially designed and shaped to absorb incident RF radiation (also known as non-ionising radiation), as effectively as possible, from as many incident direc ...

s (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. Norwegian Navy Patrol boat 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 A gas turbine or gas turbine engine is a type of continuous flow internal combustion engine. The main parts common to all gas turbine engines form the power-producing part (known as the gas generator or core) and are, in the direction of flow: ...

combined by

Renk The Renk Group AG is a German global manufacturer of transmissions, engines, hybrid drive systems, vehicle suspension systems, plain bearings, couplings, and testing systems. The company builds special gearboxes for tanks, frigates, icebreakers, ...

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. 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 of the four ships 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.

US Navy

The

U.S. Navy The United States Navy (USN) is the maritime service branch of the United States Department of Defense. It is the world's most powerful navy with the largest displacement, at 4.5 million tons in 2021. It has the world's largest aircraft ...

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 from Naval Amphibious Base Little Creek.

Vessels

References

* Saunders, Stephen "Jane's Fighting Ships 2003–2004" .

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. {{DEFAULTSORT:Skjold Class Patrol Boat Missile boats of the Royal Norwegian Navy Patrol vessels of Norway Military catamarans Stealth ships Corvette classes Patrol boat classes

Design

US Navy

Vessels

See also

Similar ships

References

External links