RFA Mounts Bay (L3008) - Design and Construction

Design and Construction

The Bay class was designed as a replacement for the Round Table class logistics ships operated by the RFA. The new design was based on the Royal Schelde Enforcer design; a joint project between the Dutch and Spanish resulting in the Rotterdam class and Galicia class amphibious warfare ships. The main difference with the British ships is the lack of a helicopter hangar. The ships were originally designated "Auxiliary Landing Ship Logistics" or ALSL, but this was changed in 2002 to "Landing Ship Dock (Auxiliary)" or LSD(A), better reflecting their operational role. Four ships were ordered; two from Swan Hunter, and two from BAE Systems Naval Ships.

The Bay class ships have a full load displacement of 16,160 tonnes (15,900 long tons). Each is 579.4 feet (176.6 m) long, with a beam of 86.6 feet (26.4 m), and a draught of 19 feet (5.8 m). Propulsion power is provided by two Wärtsilä 8L26 generators, providing 6,000 horsepower (4.5 MW), and two Wärtsilä 12V26 generators, providing 9,000 horsepower (6.7 MW). These are used to drive two steerable propulson pods, with a bow thruster supplementing. Maximum speed is 18 knots (33 km/h; 21 mph), and the Bay class ships can achieve a range of 8,000 nautical miles (15,000 km; 9,200 mi) at 15 knots (28 km/h; 17 mph). Mounts Bay is normally unarmed, but is fitted to receive two 30 mm DS30B cannons, two Mk.44 miniguns, six 7.62mm L7 GPMGs, and a Phalanx CIWS. The standard ship's company consists of 60 officers and sailors.

As a sealift ship, Mounts Bay is capable of carrying up to 24 Challenger 2 tanks or 150 light trucks in 1,150 linear metres of space. The cargo capacity is equivalent of 200 tons of ammunition, or 24 Twenty-foot equivalent unit containers. During normal conditions, a Bay class ship can carry 356 soldiers, but this can be almost doubled to 700 in overload conditions. No helicopters are carried on board, but the flight deck is capable of handling helicopters up to the size of Chinooks, as well as Merlin helicopters and Osprey tiltrotor aircraft. The well dock can carry one LCU Mark 10 or two LCVPs, and two Mexeflotes can be suspended from the ship's flanks. Two 30-ton cranes are fitted between the superstructure and the flight deck.

Mounts Bay and sister ship Cardigan Bay were ordered from BAE on 19 November 2001. Mounts Bay was laid down at BAE's shipyard at Govan, Scotland on 25 August 2002. She was launched on 9 April 2004, although it took seveal attempts to christen the ship, and she received damage after becoming entangled in chains and 25-ton weights during the actual launching. Footage from the launch ceremony was used in the opening sequence of the 2005 drama film On a Clear Day. Mounts Bay was dedicated on 13 July 2006, the first Bay class ship to enter service with the RFA.