MJP Waterjets: Double Control for Water Jets

Wednesday, September 14, 2011
Catamaran Mode

Swedish-based MJP Waterjets has succeeded in combining steering and reversing of two jets simultaneously into a central column operating both jets in parallel by means of a single hydraulic control. This new design of the steering and reversing unit called CSUI has recently been tested on the French landing craft CNIM EDA-R.

 

The landing craft with its hourglass shaped hull and has two very different operating conditions: Catamaran Mode and Barge Mode and thus called for specific design requirements.The vessel is equipped with four engines and four jets, which are driven by a MJP 650 mixed flow pump. As usual, the intake is adapted and designed to the constraints given by the hull and its application using CFD. The swath type hull with its pronounced hourglass shape results in a narrow waist at the waterline. The section below the waterline is made to an absolute minimum. During the design phase MJP have made use of CFD also to optimize the flow in the bucket to enhance the reversing performance. This is particularly important on a landing craft in order to ensure safe disembarkation from the beach. Sea trials have shown that the vessel is able to operate at the incredible speed of 10 knots in reverse at full load in open seas.

 

In Catamaran Mode, the centre platform is high above the waterline and the jets are consequently very deep in the water. When the centre platform is lowered into Barge Mode, the jets are in a more common position. The design needs to fulfil the requirements for both operating conditions. Since the jets are placed very deep in the water in Catamaran Mode, inboard hydraulics is being used to avoid the use of external hydraulics several meters below the water surface. Furthermore, the increased wet surface and increased drag caused by external hydraulics is eliminated. Due to the limited space inside the hull, the traditional MJP DRB design could not be used in this case and therefore MJP had to come up with a completely new design with the inboard hydraulics placed above the jets. The new CSUI is based on an old MJP design from the mid 90’s used for a FMV prototype owned by the Swedish Defense organization. Due to the narrow waist of the hull this time two jets in each hull are controlled through centrally located mechanical equipment in between the jets.

 

Other special features for this project include the engine rpm control, which is, at the same time, used for the platform control hydraulics, as well as the intakes, which are built of GRP in a double mounting to fit the narrow hull shape. The hydraulic system is adapted to extreme ambient temperature requirements with an electrical cooling circuit that can be used for back-up operation of the steering and reversing units. The control system has three complete control stations with a centrally located computer room. The scope of supply also includes the long intermediate carbon drive shafts including supports. Recent tests during the official sea trials showed an excellent result. At full load (270 t) a speed of 17.7 knots was reached and at light load (190 t) a speed of 29.3 knots could be demonstrated. The designer Francois Sebilo of Bureau Mauric comments as follows: “The official speed tests of CNIM EDA-R have been performed to a great satisfaction and we would like to congratulate MJP.“

Maritime Reporter August 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

Shell CEO: US Should Export Oil, Embrace Global Markets

The head of energy company Royal Dutch Shell said on Tuesday that U.S. policymakers should lift the crude oil export ban because allowing the shipments would make global energy system more stable.

SUNY Maritime Takes the Ice Bucket Challenge

Taking full advantage of one of the summer’s hottest days, twelve administrators and staff at the State University of New York (SUNY) Maritime College today took the Ice Bucket Challenge,

Fraunhofer Researchers Improve Underwater Images

Videos and images of the submarine world are important for the maritime industry. Researchers from Fraunhofer IGD will show how underwater images can be improved

Marine Propulsion

Fuel-saving Modifications for Containerships’ Engines

Mitsui Engineering & Shipbuilding Co., Ltd., and 100% owned subsidiary MES Technoservice Co., Ltd., have received an order from a Taiwan shipowner for fuel-efficiency

MN 100: FloScan Instrument Co., Inc.

3016 NE Blakeley Street Seattle, WA 98105 Telephone: 206 524 6625 / 316 E-mail: joe.dydasco@floscan.com Website: www.floscan.com CEO/President: Chuck Wurster Number

New Bulk Carrier Design Puts Ecoships in the Lotus Position

Ecoships, the technical shipmanagement arm of Newport Shipping Group, has introduced a next generation bulk carrier design, developed to set the standard in ecologically

Workboats

MN 100: Eastern Shipbuilding Group, Inc.

13300 Allanton Road Panama City, FL 32404 Tel: (850) 522-7400  Email: info@easternshipbuilding.com Website: www.easternshipbuilding.com President: Brian

MN 100: Horizon Shipbuilding, Inc.

13980 Shell Belt Road Bayou La Batre, AL 36509 E-mail: trshort@horizonshipbuilding.com Website: www.horizonshipbuilding.com President and General Manager: Travis R.

MN 100: Kvichak Marine Industries, Inc.

469 NW Bowdoin Place Seattle, WA 98107 Telephone: 206 545 8485 E-mail: sales@kvichak.com Website: www.kvichak.com CEO/President: Keith Whittemore Number of

Marine Power

Fuel-saving Modifications for Containerships’ Engines

Mitsui Engineering & Shipbuilding Co., Ltd., and 100% owned subsidiary MES Technoservice Co., Ltd., have received an order from a Taiwan shipowner for fuel-efficiency

Vard Orders Parat Electric Steam & Hot Water Boilers

During the last month, PARAT Halvorsen AS has collected four new boiler plant orders from the Vard Group and their multipurpose platform ships of Vard 1 08 design.

MN 100: FloScan Instrument Co., Inc.

3016 NE Blakeley Street Seattle, WA 98105 Telephone: 206 524 6625 / 316 E-mail: joe.dydasco@floscan.com Website: www.floscan.com CEO/President: Chuck Wurster Number

Naval Architecture

Newport News Selects Paramarine Design Software

QinetiQ’s Paramarine Ship and Submersible Design Software has been selected by Newport News Shipbuilding (NSS) as its primary naval architectural software. QinetiQ

Fogal Retires from Zentech After 57 Years in O&G

Robert “Bob” “Sonny” Fogal, Jr., one of the icons in the offshore oil and gas industry, has decided to retire from front-line work as Zentech’s Director of Business Development.

SENER Announces the FORAN V70R3.0

SENER announces the new FORAN V70R3.0, available from July 31, 2014. With more than 45 years in the market, FORAN takes advantage of SENER´s innovative development

People in the News

Shell CEO: US Should Export Oil, Embrace Global Markets

The head of energy company Royal Dutch Shell said on Tuesday that U.S. policymakers should lift the crude oil export ban because allowing the shipments would make global energy system more stable.

SUNY Maritime Takes the Ice Bucket Challenge

Taking full advantage of one of the summer’s hottest days, twelve administrators and staff at the State University of New York (SUNY) Maritime College today took the Ice Bucket Challenge,

ClassNK Head Attends KOTC Delivery Ceremony

Noboru Ueda, Chairman and President of ClassNK attended the delivery ceremony for the M/T Al Yarmouk, constructed at Daewoo Shipbuilding & Marine Engineering Co.

 
 
Maritime Contracts Navigation Pipelines Port Authority Salvage Ship Electronics Ship Simulators Shipbuilding / Vessel Construction Sonar Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1906 sec (5 req/sec)