Examining Hull Pressure on the Staten Island Ferries

By Rien de Meij, MARIN
Tuesday, January 21, 2014
MARIN’s Depressurized Wave Basin was the site for a test of the best propulsor configuration for the Staten Island ferries.

For the first time an investigation into Voith Schneider Propulsor-induced hull-pressure fluctuations has been carried out. This investigation was part of a New York City Department of Transportation (NYCDOT) study to retrofit the Molinari Class Ferries, which operate to the world-renowned Staten Island, with Voith Schneider Propulsion (VSP).
One of the objectives was to investigate the modification in terms of energy efficiency.
The Staten Island Ferry carries more than 21 million passengers annually between Staten Island and Lower Manhattan. The three sister ships, Guy V. Molinari, Sen. John J. Marchi and Spirit of America, can carry 4,427 passengers and have a crew of 16. The double-ended ferries have a propeller gondola, conventional propulsion system and one center skeg at both ends.
The study started by adapting the current hull lines for a propulsion arrangement consisting of four VSP26R5 units. After the lines were optimized, a 7.3 m long ship model was manufactured and a model test program for the optimization of the Voith Schneider propulsor arrangement was carried out in the Shallow Water Towing Tank.
The goal of these tests was to determine the best propulsor configuration, which requires the lowest shaft power at design speed, focusing on the best direction of rotation, thrust vector direction and power distribution between the fore and aft VSP units.
With the selected configuration, propulsor cavitation observations and measurements of the propulsor-induced hull pressure fluctuations were carried out in the Depressurized Wave Basin. Cavitation observations and measurements were performed on the portside aft propulsor, with all four VSPs active.
It was concluded that the level of the measured hull excitation caused by the two active aft VSPs is low.
The highest levels are measured on the center line of the ship, which is due to interaction between the portside and starboard VSP units.
This observation resulted in recommendations for a minimum spacing between the two aft propulsors.
The main advantage of the tested configuration, compared to the existing set up, is the increased maneuverability of the vessel.
These results supported the NYCDOT in its decision-making for future developments of the Staten Island Ferry.

 

(As published in the January 2014 edition of Maritime Reporter & Engineering News - www.marinelink.com)

  • Rien de Meij, MARIN

    Rien de Meij, MARIN

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

Ship Repair & Conversion

Braemar Hosts Insurance Experts

Braemar (incorporating The Salvage Association) welcomed an invited group of marine insurance professionals onto its specialist port and shipyard familiarization

Minimize the Risks, Think Cold Bonding

Cold bonding: a safer alternative to hot work Hot work required for welding, grinding and cutting operations presents certain potential hazards when conducted

Goltens Opens Houston Service Facility

Goltens Worldwide today announced the opening of its new full service facility located within two miles from the Port of Houston. Following months of planning and machinery and equipment installation,

Passenger Vessels

Ferry Unit SNCM to Seek Court Protection Next Week

France-Corsica ferry operator SNCM will file for court protection next week, a source close to the company told Reuters on Wednesday, which will clear the way for

Cruise Shipping: RCL's 'Quantum of the Seas' Delivered

First Ship of New Class for Royal Caribbean MEYER WERFT delivered the 167,800-gt cruise ship Quantum of the Seas to the U.S. cruise operator Royal Caribbean Cruises Ltd.

L-3 MSI Supplies Navigation for the Oasis Class

L-3 Marine Systems International (L-3 MSI) has been awarded a contract to provide its NACOS Platinum navigation system, including an integrated dynamic positioning system,

Marine Power

Wärtsilä Propulsion Equipment for 2 Fishing Vessels

Two new 78 metre purser/trawler fishing vessels being designed and built at Karstensen Shipyard in Denmark will feature Wärtsilä's main propulsion and control equipment.

Marine Renewable Energy Testing Facility in Singapore Mooted

ClassNK has launched of a feasibility study for a new marine renewable energy testing facility to be built in Singapore. The announcement was made at the 2014

Teekay Renews Hull and Propeller Monitoring for LNG Carriers

Canada-based shipping company Teekay Corporation has renewed its contract with Propulsion Dynamics for its hull and propeller performance monitoring system CASPER Service.

Naval Architecture

AVEVA E3D Takes Center Stage

Customer case studies combine with advances in asset visualization and cloud technologies to showcase a new era in the creation and management of complex Digital Assets.

Naviera Integral Orders Damen Fast Crew Suppliers

Naviera Integral of Mexico is the launching customer of Damen’s new Sea Axe Fast Crew Supply vessel, the FCS 4008. President of Naviera Integral, Juan Pablo Vega,

Wärtsilä Propulsion and Design for Two OSVs

Two new 150-ton-bollard-pull anchor handling offshore support vessels (AHOSVs) being built at the Colombo Dockyard in Sri Lanka have been designed by Wärtsilä and

Vessels

USCG Cutter Diligence Returns

The crew of Coast Guard Cutter Diligence returned to Wilmington following a 45-day patrol in the Caribbean Sea. While on patrol, Diligence served as the

Southern California Port Congestion

Hapag-Lloyd informs about the congestion at the ports of Los Angeles and Long Beach that has reached a critical point. I. Several container ships are anchoring

GAC Starts Green Hull Cleaning Operations in Oman

Oman’s Ministry of Environment and Climate Affairs has granted GAC EnvironHull permission to conduct underwater hull cleaning operations using the brush-and-diver-free

Ferries

Easing US Oil Export Ban Unlikey to Raise Gasoline Prices

A government study on Thursday essentially supported the notion that easing the decades-old restriction on exporting U.S. crude was more likely to lower than raise

Aquarius MAS with Marine Solar Power Installed on Delos

Eco Marine Power together with strategic partners has installed an Aquarius Management & Automation System (MAS) integrated with a marine solar panel array on-board the Blue Star 'Delos'.

Ferry Unit SNCM to Seek Court Protection Next Week

France-Corsica ferry operator SNCM will file for court protection next week, a source close to the company told Reuters on Wednesday, which will clear the way for

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Naval Architecture Navigation Offshore Oil Pipelines Pod Propulsion Ship Repair 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: 0.2307 sec (4 req/sec)