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Featured Companies

Marintec China / CMP China
Marintec China is jointly-organised and managed by CMP/Seatrade and the Shanghai Society of Naval Architects and Marine Enginners. Marintec China 2009 will be held at Shanghai New International Expo Centre from 1–4 December 2009.
    China
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Ferry Management Services Limited
www.ferrynews.com is a new website brought to you by ferry industry professionals, Ferry Management Services & Seatrade. Hyperlink Market Intelligence will take you to a 50,000 word database of global ferry information referenced by operator.
    United Kingdom
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DC Maritime Technologies Inc.
DCMT are professional electrical engineers and systems integrators. The company provides electrical, control and automation engineering expertise to the international marine, offshore and recreational boat industries.
    Canada
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Sumptech Co., Ltd
We manufacture dredging pumps. Range from 30 to 500HP. Electric and Hydraulic Driven. 1-year guarantee on non-wearing parts. Applications include dredging and cargo transfer, heavy duty pumps with agitator for high solids content.
    Taiwan

Hull Efficiency Analysis

      1/11/2006


Surface Wave Radar System
Gas Turbines for High-Speed Yacht
Vietnam Shipbuilding Set to Grow

Hull Efficiency Analysis


Propulsion Dynamics (Long Beach, California) will present a paper at the Marine Coatings conference associated with the Paint and Coating Exhibition (PACE 2006) to be held in Tampa, Florida (January 29 through February 1, 2006). The paper will focus on the results that Propulsion Dynamics has achieved with its CASPER hull efficiency analyzing service on over 25 vessels in North America. The types of vessel that have been under propulsion surveillance by CASPER include tankers, containerships, and cruise liners. They have included ships of different ages and hull forms; those with various coatings, including CDP, SPC and Silicon coatings.

For these ships, the performance penalty due solely to fouling was observed and plotted in ‘real-time’ and then utilized by the ship owner as an analytic tool to compare efficiency and cost-benefit of different types of hull coatings and determine economically optimum cleaning intervals. Results indicate that operational hull efficiency cannot be deduced solely from figures published for the type of coating. Hull efficiency is affected by the vessel’s treatment in drydock, time out of dock, time in port, loading conditions, service speed, port water contamination, and water temperature.

Hull Efficiency Analysis

To implement the CASPER service, the ship is only required to submit one weekly datasheet via the Internet. The datasheet gives the vessel’s draft and trim, the wind and sea conditions, and the power delivered to the propeller, among other common variables similar to a noon-report. Since this information is already available on the ship, no new equipment or software is required. CASPER employs an advanced hydrodynamic method to calculate the true speed of the ship through the water, and normalizing figures for wind, waves, sea current, and water temperature and salinity from submitted performance data. Fundamental to the analysis is the accurate measurement of propeller revolutions; the power delivered to it and its design characteristics. Using this information, CASPER analyzes the effect of hull coating efficiency for vessels in service against the performance of the vessel with a clean, smooth hull found at sea trials.


 

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