Page 28: of Maritime Reporter Magazine (May 1999)

MARINE ENGINEERING • Materials

Mount Pinatubo, which forced the road from Manila impassable as a result of mud and landslides.

The Wavemaster is powered by three

MTU 12V 183 TE92s, with only the wing engines equipped for maneuvering and a guaranteed speed of 29 knots and a deadweight of 12 tons. The excess amount of space around each engine and auxiliary is a prime example of the industry's preference to monohulls rather than catamarans. Exhausts are dry and are funneled through a utility stack including access stairs, vents and C02 storage.

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Main Particulars

Flag Philippines

Classification DNV

Length, o.a 100 ft. (30.5 m)

Length, b.p 83 ft. (25.4 m)

Beam (molded) 21 ft. (6.5 m)

Depth (molded) 12 ft. (3.8 m)

Draft 4 ft. (1.1 m)

Fuel cap 5,000 ltrs.

Fresh water 1,000 ltrs.

Main engines MTU

Water jets Hamilton

Auxiliaries Cummins-Ona

Speed 29 knots

Deadweight 12 tons

Range 250 nm for 95% fuel

Passengers 176

Radar Furuno

Sounder Furun

Radio Sailor DSC VHF

JJMA: Stern Wedge

Boosts Speed 22%

The Victoria Clipper III recently gained as much as five knots increased speed due to the fitting of a stern wedge.

The 95-ft. (29-m) catamaran passenger ferry was built by Gladding-Hearn Ship- builders and powered by a pair of

Detroit Diesel 16V149 engines driving

Kamewa waterjets. Over the years, the vessel's performance deteriorated, mainly due to capacity increases and other weight changes, to about 22.5 knots when fully laden.

Unsatisfied with performance, Clipper

Navigation Inc. contacted John J.

McMullen Associates (JJMA) to explore its options. "Service expecta- tions in the ferry industry are constantly moving higher," said Clipper executive vice president arid general manager Dar- rell Bryan. "We'd like our ships to be as fast as possible, always within the bounds of the affordable.

We discussed a wide range of options, from repowering to weight reduction.

Finally, JJMA convinced us that a stern wedge would improve both craft trim and powering performance."

JJMA reportedly used the Shipflow

Computational Fluid Dynamics (CFD) software to analyze the ship. "We built a simple computer model of the hull of the ship. Then we added various wedges and ch;iracterized their perfor- mance," said Chris Higgins, a JJMA naval architect. "We found the most effective wedge to be quite short and steep, almost surprisingly so."

The wedge was fabricated at Marco

Seattle Shipyard. Fabrication included modifying the pre-existing trim tabs to relocate them into the bottom of the new wedge, and removal of the waterjet intake guards. "Our total investment was less than $30,000," said Bryan. "I'm very pleased at getting four to five knots speed gain for this investment."

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Tuflex Makes The Grade In Tug

Applications

Tuflex rubber flooring is used throughout a variety of industries, and has found a popular niche to be the rig- orous use tugboat market. The product has proven to be durable, and is non-

Maritime Design, Inc.

Naval Architects/Marine Engineers w system

The Double Hull Solution in retrofit technology U.S. Patent m\ "a p

I k t

Professional Services to the

Marine Transportation, Offshore

Development and

Shipbuilding Industries

Specializing in Shipyard Production Support

From Shipyard Environment to At-Sea-Demand

We Know How Ships Are Built!

Naval architecture and marine engineering services for ship design, new construction, regulatory compliance and specialized areas pertaining to mission requirements.

Maritime Design, Inc. 13000 Sawgrass Village Circle Suite 16 Ponte Vedra Beach, Fl 32082 USA Contact: Jim Konopasek (904)273-0334 Fax (904)273-1685

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DONN .r, M Marine Bulkhead System

An attractive, affordable, and efficient alternative to conventional joiner bulkheads. Meets structural, safety and budget considerations while contributing to the quality of life at sea.

Distributed By King Wholesale Supply Co., Inc. 727 South Cortez Street

New Orleans, LA 70019

For information, call 1 (800) 299-9888 and ask for our Marine Division.

Made in the U.S.A.

U.S. Coast Guard approved for use in B-15 rated bulkheads in A-60 construction applications 100% accessible

Complete, integrated system

Smooth, monolithic appearance

STC rating of 40

Abuse resistant panels

Long-term rust protection

Low maintenance on matched finishes

Affordable alternative to conventional joiner bulkheads

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