Waterjets for lightweight patrol craft

The UAE Navy has ordered 12 new fast patrol boats, based on the proven Ghannatha class fast troop transport vessel. These are under construction by Abu Dhabi Ship Building (ADSB), with the first due to enter service in 2012.

Jay Dagher, Rolls-Royce’s regional naval marine manager said: “We are proud that the UAE Navy has again chosen our technology for their latest vessels. This latest order underscores the strength of our relationship with both the UAE Navy and ADSB. “There are already 150 Rolls-Royce waterjets in service across the region and this order further increases our presence in this important market. In response to this growth, and to provide in-service support for our growing customer base, we are working with ADSB to establish a waterjet service centre in Abu Dhabi.”

Each vessel will be equipped with two Kamewa FF600 waterjets, designed and manufactured by Rolls-Royce. The waterjets are fitted with interceptors to enable tighter turning capability, better stability and to reduce fuel consumption.

Rolls-Royce says that it is currently the only company that builds interceptors on waterjets which are controlled with a waterjet control system known as the incorporated interceptor control (IIC). This means that interceptors no longer need to be purchased, installed or controlled separately, which the company says enables greater efficiency and time savings in the ship-building process.

The order also includes a joystick control system that will improve the manoeuvring capability of the vessels.

The new vessels, measuring 26.5m in length, are of aluminium construction, and the waterjets will enable a maximum speed in excess of 35 knots.

Kamewa waterjets are used to power a range of vessels from inshore craft to ocean going vessels. Rolls-Royce says that its pump technology gives enhanced pulling thrust at lower speeds and the lightweight aluminium construction reduces overall vessel weight to offer higher speeds with improved fuel economy. Manoeuvrability is improved compared with conventional propulsion systems, while the absence of moving parts protruding beneath the hull allows waterjet powered vessels to operate in shallow waters and increases safety during rescue missions.

Rolls-Royce has has previously supplied FF550 waterjets and SII Kamewa waterjets to the UAE Navy.