Feature 7 | PROPULSION
MJP used CFD to optimize the flow in the waterjets’ buckets in order to enhance the reversing performance of the propulsors once the EDA-R had beached.
with the inboard hydraulics placed above the waterjets. Te CSUI is actually based on an old MJP design from the mid-1990s that was used for a prototype vessel owned by the Swedish Defence Materiel organisation. Due to the narrow waist of the hull two jets in each of the hulls are controlled through centrally located mechanical equipment in between the jets. Other special features developed
especially for the project include the engine rpm control, which is also used for the platform control hydraulics, as well as the intakes, which are built of GRP in a double mounting in order to fit the narrow hull shape.
The CSUI combines the steering and reversing functions of two waterjets on a central column.
Rolls-Royce wins contract for Indian Coast Guard
Rolls-Royce has secured a contract from Cochin Shipyard in India to supply 60 waterjets for a fleet of 20 Fast Patrol Vessels for the Indian Coast Guard. The contract will involve the supply of Rolls-Royce Kamewa 71S3np waterjets (three per vessel), and associated equipment including a joystick control system which will enhance the manoeuvring of the vessels. The 50m-long vessels, which are currently under construction, will reach speeds of 33knots and will operate in Indian coastal waters and island territories. Their roles will include coastal patrol, anti-smuggling missions, fisheries protection, and search and rescue. Waterjets enable the craft to operate in shallow water and offer higher speeds and enhanced manoeuvrability compared to conventional propellers.
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“Due to the limited space inside the hull, the traditional MJP double reverse bucket (DRB) design could not be used so MJP had to come up with a completely new design”
Te hydraulic system has been adapted
to meet the requirements of extreme ambient temperatures, with an electrical cooling circuit that can be used for back-up operation of the steering and reversing units. Te control system has three control stations with a centrally- located computer room. The scope of supply also includes the intermediate carbon drive shaſts, including supports. During sea trials the EDA-R
demonstrated a full load (270tonnes) speed of 17.7knots. At light load (190tonnes) a speed of 29.3knots was achieved. WT
Warship Technology January 2012
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