Third Skjold-class FPB Delivered to Norway

By Keith Henderson at July 12, 2011 08:44
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At the end of June, the Royal Norwegian Navy received delivery of their third Skjold Class vessel from DCNS. First-of-class P961-Storm was delivered in September 2010 and the second vessel P962-Skudd the following month. The program is being supplied by a consortium of three contractors: the Norwegian companies Umoe Mandal and Kongsberg Defence & Aerospace and DCNS, France as the combat system design authority.


Caption: Royal Norwegian Navy FPB Skjold (P 690). The craft is painted in a splinter camouflage scheme.
Image credit: U.S. Navy NewsStand, Don Montgomery.

The Skjold Class FPB, sometimes referred to as a coastal corvette, is designed for marine security and safety missions in Norway’s coastal waters. Reduced manning levels with communication and combat systems fully compatible with international and NATO standards was a pre-requisite of the specification. The low radar cross section  design of hull and fittings gives a low acoustic, infra-red, magnetic and optical signature to deliver a high stealth capability.

The vessel is a Surface Effect Ship (SES), of fiberglass/ composite construction built in Norway by Umoe Mandal. Between the catamaran hulls, a skirt arrangement with finger seals in the bow and a bag seal in the stern provides an air cushion of which the height can be increased by twin air fans. The 275 tonne vessel has an LOA of 156 ft (48 m), beam 44 ft (13.4 m) and a draft of 3.3 ft (1.0 m). The original prototype was powered by twin Rolls-Royce/Allison KF 571 each of 7,690 hp (5,735 kW) plus twin MTU 6R183 for slow speed operation driving two Kamewa waterjets. Two auxiliary MTU 12V183 of 693 kW (930 hp) provide power for the air lift fans.

The final propulsion arrangement was changed to COGAG by replacing each Allison with a father/son turbine arrangement of Pratt & Whitney ST40M of 2,982 kW (4,000 hp) and ST18M of 1,393 kW (1.894 hp) gas turbines. This provides greater flexibility in the propulsion system and will deliver tangible fuel savings in operation. The diesels remain for slow steaming.
The performance is record breaking with a top speed in excess of 60 kn in sea state 0, dropping to 47 kn at sea state 3 and 25 kn at state 5. The normal ship’s crew is 15 with provision for 17.

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