Efforts continue to improve the Modeling of Thrusters

Thursday, September 19, 2013
Robert Heerkink is project manager at the Ships department of MARIN, the Maritime Research Institute Netherlands.

MARIN uses thrusters in many projects. For a typical model scale, around 1:50 to 1:60, relatively small thrusters are required. Thrusters for these models are available ranging from 50 mm to 80 mm nozzle diameters.  In the past these thrusters were always modelled with a horizontal shaft.
By tilting the nozzle, the closest possible match was achieved between the client specifications and the modelled thruster for the basin tests.
Due to the ever-evolving process in improving the models, new thrusters were built witha 7-degree tilted thruster shaft.
Special gears were made for a reliable and durable thruster model and with these new thrusters it is still possible to mount nozzles with a slightly different angle. See figures for examples.
The newly built thrusters give clients the ability to choose a more accurate representation of the thrusters used during model testing.

Robert Heerkink is project manager at the Ships department of MARIN, the Maritime Research Institute Netherlands. MARIN offers simulation, model testing, full-scale measurements and training programs, to the shipbuilding and offshore industry and governments.

 

(As published in the September edition of Maritime Reporter & Engineering News - www.marinelink.com)
 

  • 7 deg. tilted axis,  5 deg. tilted nozzle

    7 deg. tilted axis, 5 deg. tilted nozzle

  • Model with mounted thrusters

    Model with mounted thrusters

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

Offshore

BP Gulf Spill Trial Set For January

The high-stakes penalty phase of BP's trial over its role in the 2010 U.S. Gulf of Mexico oil spill will start next January, court officials said on Tuesday,

North Sea Maintenance Offsets Lack of Sales to Asia

North Sea Forties crude differentials were unchanged on Tuesday in light trade, supported by upcoming North Sea maintenance, but the forward curve weakened due

Saipem: A Fleet Grows in Brazil

As some pre-salt plays begin production, a wide range of subsea infrastructure is being built, with O&G transportation pipeline grids being one of the vital downstream systems.

Navigation

Reminder Stresses Importance of Accurate Clearance Information

The Captain of the Port, New York-New Jersey, has issued a reminder about the importance of providing accurate clearance information, and warns that civil penalties

NOAA Begins Hydrographic Survey Season

New data will update nautical charts around the country. As sure as spring arrives, NOAA vessels and independent contractors are hitting the seas for the nation's

Air Draft Alert: Bayonne Bridge Struck Twice this Year

The Bayonne Bridge is undergoing a two-year construction project to raise the roadway an average of 65 feet. The Captain of the Port, New York-New Jersey says that

Marine Power

Fishing Vessels Fit with Wärtsilä’s NOx Reducer

Wärtsilä said its new NOx Reducer will be fitted to two new fishing vessels under construction at the Celiktrans yard in Turkey. The ships are owned by HB Grandi,

NCL Spotlights Eco-Smart Cruising Program

On Earth Day, Norwegian Cruise Line NCL) celebrated key achievements from the past year that, as a part of its Eco-Smart Cruising program, help preserve the world's oceans.

Coast Guard Pacific Area receives new commander

Vice Adm. Charles W. Ray relieved Vice Adm. Paul F. Zukunft as Commander, Coast Guard Pacific Area and Coast Guard Defense Forces West, in a change of command

Naval Architecture

IHC Merwede Secures TSHD Order from TNPA

IHC Merwede has been awarded the contract for the design, construction and delivery of a 5,500m3 trailing suction hopper dredger (TSHD) to Transnet National Ports Authority (TNPA) in South Africa.

BMT, Ares Deliver Luxury Passenger Ferries

BMT Nigel Gee (BMT), a subsidiary of BMT Group, and Ares Shipyard announced that the first two boats of a series of eight luxury passenger ferries destined for Qatar,

New Conept Under Test: Arctic Drillship

When Ulstein Sea of Solutions (USOS) took part in a concept design competition for an arctic drillship, MARIN was asked to investigate the concept variations. USOS

Dynamic Positioning

If You Have DPS Questions ... OSVDPA Has Answers

Over the past two years, the only constant in the dynamic positioning industry has been uncertainty. A new certification scheme, a long-awaited revision of the

Time Charter of DP-1 Research Vessel Fixed

Marcon International, Inc. of Coupeville, Washington reported that Stabbert Maritime of Seattle has time chartered the U.S. flag, DP-1, research vessel Ocean Pioneer (ex: Seabulk Montana,

 
 
Maritime Careers / Shipboard Positions Maritime Security Navigation Pipelines Pod Propulsion Salvage Ship Repair Shipbuilding / Vessel Construction Sonar Winch
rss | archive | history | articles | privacy | 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: 0.1484 sec (7 req/sec)