Page 58: of Maritime Reporter Magazine (June 1999)

10 Significant Marine Innovations

Medium Speed RoRo Passenger Catamarans

Over the industry fast fei has b] med, hile the marine g totally on the

Australian company ing a full range of catama- ,500-car ity, and the Sea

TranSf^^^^^^^^^^B^hose Naval

Architecta^^^^MnT Sea Transport

Solutions (STS), totally focused on an economic alternative right between the choice of fast and conventional ferries.

They became aware that a stated dead- weight of RoPax vessels, when under closer scrutiny of the Stability book, particularly the limiting criteria of the arrival port condition, highlighted a maximum Revenue Deadweight (or pay- load) considerably less, sometimes down as far as 50 percent of the total stated deadweight.

Group CEO, Stuart Ballantyne, said that after extensive investigations of the

Revenue Deadweight of existing fast and conventional designs, most conven- tional and fast ferries have a revenue deadweight or payload of approximately 25 to 35 percent of the vessel's lightship weight. When plotting revenue dead- weight against service speed, there appeared to be an interesting "target void" between the high speed and con- ventional vessels.

While Maritime Reporter covered the developments in lightweight materials and improvements in vessel dead- weights in the May 1999 edition, STS have investigated the aspect of revenue deadweights and speed and plotted the graph.

As can be seen, the high speed craft designers are attempting to get more

Rdwt and the conventional designers are focusing on getting more speed, high- lighted during last month's Cruise and

Ferry Conference in London, Kvaerner

Masa's design chief, Kai Levander, highlighted this incremental push for speed by conventional RoPax vessel owners.

Ballantyne's STS team focused on the "target void" and a solution to fill the

Plot the Rdwts and service speeds of current Ropax designs

Revenue Deadweight / Speed Graph 6 35 30 C *

C 25 _ * r • wrget 1/ HSC Gifi /

Convert 4 tioripl • • / / 1500 2000 2500 3000

Revenue Deadweight in Tonnes

In examining the speed and capacity characteristics of the existing ferry fleet, Stuart Ballantyne found a "target void" which he seeks to fill with his innovative RoPax design.

The Mooring

Mooring Systems

Specialists

Vossel Dotking

Harbour & Marine

Engineering PTY LTD 79 Asling St. Brighton, Melbourne, Australia. 3186.

Phone: +61 3 9530 6333 Fax: + 61 3 9530 6366.

Email: [email protected]

Web: http://www.harbourmarine.com

USA OFFICE

Mr. Dan Grothe

Phone: +l 303 779 4905 Fax: +303 721 9310

Email: [email protected] • Quick release hooks • Remote release • Vessel load monitoring • Integrated jetty monitoring • Instrumentation • Port communication • Closing distance and speed of approach • Visual and audible alarms • Laser and/or radar • Display board or hand held display • Intrinsically safe • Provides permanent record

Circle 181 on Reader Service Card 60 "The Yearbook" Maritime Reporter/Engineering News