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 May 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Ship Repair & Conversion

Unicom Selects the Ecochlor BWTS for 10 Tankers

Ecochlor, Inc. announced that Unicom Management Services (Cyprus) Ltd. (Unicom), acting for SCF Group, signed a 10-vessel agreement for the Ecochlor Ballast Water Treatment System (BWTS) in Limassol,

Kongsberg Contracted to Support FLNG Conversion

Kongsberg Maritime secures position in the LNG market with electrical and automation contract for Golar Hilli FLNG   Keppel Shipyard in Singapore and Black & Veatch in the U.

Crowley to Manage 4 Jones Act Ships for Pasha

Crowley Maritime Corp.’s ship management group has been awarded a new contract with Sunrise Operations LLC, a subsidiary of The Pasha Group, of San Rafael, Calif.

Passenger Vessels

Overnight Cruise Ship Visits Suspended in White Bay

The New South Wales (NSW) Port Authority has suspended all overnight cruise ship visits to White Bay until the NSW Environment Protection Authority (EPA) has regulated

Thailand: 300 "boat people" Landed in Recent Weeks

Around 300 "boat people" have landed on Thailand's shores in recent weeks, Sek Wannamethee, director-general of the information department at Thailand's Foreign Ministry, said on Friday.

New Ferry Safety Initiative from RINA

Italy-based classification society RINA informs it has launched a ferry safety initiative.    The Asset Integrity Management scheme for ro-pax ferries covers fire risk mitigation,

Marine Power

New Power Optimization Solution for LNG Carriers

NAPA and DSME launch tailored NAPA-DSME Power Solution for LNG carriers; leading LNG carrier shipyard offers specialized performance monitoring solution   South Korean shipbuilder,

New Ship Continues Atlantic Offshore's Fleet Modernization

Atlantic Offshore Rescue will unveil the third new vessel in the past 12 months as part of its fleet modernization program, representing an investment totaling $458 million.

Iran, Oman Sign Maritime Agreement

Iran's Mehr news agency said that Iranian Foreign Minister Javad Zarif and Omani Foreign Minister Yusuf bin Alawi have announced that the two countries have agreed

Naval Architecture

Kongsberg Contracted to Support FLNG Conversion

Kongsberg Maritime secures position in the LNG market with electrical and automation contract for Golar Hilli FLNG   Keppel Shipyard in Singapore and Black & Veatch in the U.

Design & Operation: Wind Farm Support Vessels

Offshore wind farm development has been led globally by the UK, followed by Germany. Both countries have governments with long term commitments to renewable energy.

Crowley’s 2nd LNG ConRo Ship Ahead of Schedule

Shipbuilder VT Halter Marine, Inc. announced construction has started early for the second liquefied natural gas (LNG)-powered ConRo ship, Taíno, for Crowley Holdings, Inc.

Vessels

Scorpio Tankers' Buyback Plan, Newbuild Delivery

Scorpio Tankers Inc. announced today (i) a new $250 million Securities Buyback Program, (ii) that it has recently taken delivery of an MR product tanker and

Unicom Selects the Ecochlor BWTS for 10 Tankers

Ecochlor, Inc. announced that Unicom Management Services (Cyprus) Ltd. (Unicom), acting for SCF Group, signed a 10-vessel agreement for the Ecochlor Ballast Water Treatment System (BWTS) in Limassol,

Crowley to Manage 4 Jones Act Ships for Pasha

Crowley Maritime Corp.’s ship management group has been awarded a new contract with Sunrise Operations LLC, a subsidiary of The Pasha Group, of San Rafael, Calif.

Ferries

Offshore O&G: Weathering the Storm

Vessels are stacked as Gulf oil operators retrench and day rates fall. In the Gulf of Mexico, vessels serving offshore oil-and-gas exploration and production are

New Ferry Safety Initiative from RINA

Italy-based classification society RINA informs it has launched a ferry safety initiative.    The Asset Integrity Management scheme for ro-pax ferries covers fire risk mitigation,

Alewijnse Success at Damen Shiprepair Dunkerque

Electrical system integrator Alewijnse Marine Systems is celebrating the first anniversary of delivering electrical services and maintenance to vessels at Damen Shiprepair Dunkerque.

 
 
Maritime Contracts Maritime Security Maritime Standards Offshore Oil Pipelines Salvage Ship Electronics Ship Repair Ship Simulators Sonar
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: 0.1755 sec (6 req/sec)