114 Encyclopedia of Ship Knowledge

Collar, collar plate – A welded plate used to, partly or completely, close a hole cut for a longitudinal stiffener passing through a transverse web.

Collision – The act of ships striking each other.Collision bulkhead – see bulkheads.Collision damage – Damage caused by physical contact between two or more ships.Collision Regulations (COLREG 1972) – The Convention on International Regulations

for Preventing Collision at Sea adopted in 1972 by IMO.

Combined diesel-electric and diesel-mechanical (CODED) propulsion – A novel propulsion and machinery concept developed by Wärtsilä Corporation. The concept features a diesel-mechanical part driving a conventional propeller and a diesel-electric power plant powering one or more electric pods.

Collar

Illustrations courtesy of Wärtsilä Corporation

Pod 12,000 kW

Lips Feathering CPP 25,500 kW

Lips EfficiencyRudder

Wärtsilä 9L46C 9450 kW

Wärtsilä 12V46 12,800 kW

Pod 12,000 kWWärtsilä 9L46C 9450 kW

Wärtsilä 12V46 12,800 kW

Wärtsilä 9L46C 9450 kW

Wärtsilä 9L46C 9450 kW

Wärtsilä 9L46C 9450 kW

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Continuous watch

Illustration courtesy of Rolls-Royce

CONTAZ

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Illustrations courtesy of Wärtsilä Corporation

Gross tonnage 2425 3680 4067Net tonnage 727 1220

Service speed 15.5 knots 14.4 knots 17.50 at 5.8 m 15Propulsion system Diesel-electric Diesel-electric Diesel-electric Diesel-electric

Engines 2x Wärtsilä 9L201x Wärtsilä 6L20 3x Wärtsilä 6L32

MAN B&W2x1600 kW2x1200 kW

Range 45 days 42 days 35 daysPersonnel 31 35 45 40

Further information on RV CELTIC EXPLORER and G.O.SARS can be found on www.skipsteknisk.no

Research vessel Cefas Endeavour

Fishery research vessel CELTIC EXPLORER

552 Encyclopedia of Ship Knowledge

shipyard Abeking & Rasmussen. Both the station ship and the pilot tenders have excellent seakeeping performance and manoeuvring capabilities. During adverse weather conditions, the pilot transfer service can continue even at a waveheight of 3.5 m (wind force 10-11).

See also SWATH research vessel PLANET.Useful website: www.abeking.com

SWATH research vessel PLANET On February 1st, 2005 the maritime journal HANSA chose the research vessel

PLANET as the “Ship of the Year 2004”. This twin-hull vessel was built by Nordseewerke in Emden. The vessel with a length of 72 m and a width of 27.2 m has a displacement of 3,500 tons, which makes it the largest SWATH twin-hull vessel ever built by a German shipyard. But not only the size but also the technology is completely new. The PLANET is the first All Electric Ship (AES) built in Germany.The machines for propulsion and generators for energy supply are conceived in Permanent Magnet Excitation Technology. Her propulsion plant consists of two diesel gensets of 1275 kW each, two diesel generators of 1700 kW and four propulsion motors, all using PM technology. Even the ship mains and the ship propulsion network are used for the first time in this configuration on a sea-going ship. A specialchallenge for the shipyard were the high acoustic requirements for the vessel. For this purpose, the know-how from submarine technology was very helpful.

The service speed is 15 knots giving the ship an operational range of 5,000 sea miles and an endurance of about 30 days. She carriers a crew of 25 and also accommodates 20 scientific personnel. The main tasks of the PLANET are surfaceand underwater naval research as well as testing of navy-specific components, inparticular torpedoes, and sonar equipment.

Photo courtesy of Abeking & Rasmussen

Pilot station

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The average bow thruster power in ferries is 0.54 kW/m2 (total bow thruster power/projected windage area), varying up to 0.96 kW/m2. The tendency seems to be towards 0.6-0.8 kW/m2. Stern thrusters seem to be dimensioned at 0.2-0.25 kW/m2.

Outboard thruster – In operation the stern-mounted outboard thruster is similar to an outboard engine on a speedboat, and is capable of being lifted out of the water for easy maintenance and to reduce drag while underway.

Retractable thruster – A thruster able to be pulled up or in.

Rim drive thruster – A novel type of tunnel thruster developed by Rolls-Royce and Smartmotor from Trondheim working in close collaboration. The electrical motor has the form of a thin ring. Its stator is incorporated in the tunnel and its rotor

Tunnel thrusters

Illustrations courtesy of Rolls-Royce

EPSTM Thruster from VAN DER VELDEN