Page 12: of Maritime Reporter Magazine (February 2000)

Tellusart ": This Search & Rescue Transponder

Can Separate You

From The Clutter. • When Tellusart " receives a radar pulse, it transmits a series of

B twelve pulses ; in response which make you stand

I out clearly. • Part of the new IMO/GMDSS requirements but a worthwhile safety product for everyone. • Lightweight, portable and could save your life. nat nORTHERN aiPBORNE tECHNOLDGY

Northern Airborne Technology, Inc. 28 Lord Road, Suite 130, Marlborough, MA 01752, USA

Toll-free. 800 225 4767 Tel. 508 303 6762

Fax. 508 303 6763 E-Mail, [email protected] www.nat-inc.com arch Out

Rescue. • This "smart" 406

GPS-EPIRB has its own internal GPS that adds

LAT-LON position data to your satellite distress transmission - helping rescuers find you sooner.

Uses both GEOSAR and j,COSPAS-SARSAT networks fa itaneous alerting (no waiting for satellite pass in the temperate waters where you're more likely to be). • 1999 Winner of the Pittman and Seatrade Awards for safety gear; selected fa use on all yachts in "Around Alone" Race. »Certified, approved, and IMO/GMDSS compliant. :*: nat nORTHERN aiRBORNE TECHNOLOGY

Northern Airborne Technology, Inc. 28 Lord Road, Suite 130. Marlborough, MA01752, USA

Toll-free. 800 225 4767 Tel. 508 303 6762

Fax. 508 303 6763 E-Mail, [email protected] www.nat-inc.com

Circle 269 on Reader Service Card

Investment in Design (Continued from page 10) and Bird-Johnson. The overall effort began at Carderock headquarters,

Bethesda, in October 1998 and is a four- year, $2.8 million program involving both structural and hydrodynamic research and development.

The Carderock Division, with its unique laboratories and test facilities, large-scale land-based engineering and test sites, and at-sea measurement facil- ities, is and has been at the forefront of technologies vital to the success of the

Navy and maritime industry for more than a century. The key element in the technological success of the Division is the breadth and depth of its capabilities.

The Division provides cradle-to-grave support for its technical products over an enormous breadth of scientific areas related to surface and undersea plat- forms. Today, the Division is applying its expertise to ensure that the Navy maintains tactical superiority in the most cost-effective manner. Such work embodies "core equities" of the Naval

Sea Systems Command (NAVSEA) helping fulfill a unique roll in Defense

Department acquisition strategy.

Air Products Develops

World's Largest

Air Products AS, has successfully delivered and established the world's largest nitrogen generator system ever produced for shipboard application, based on membrane technology while utilizing PRISM membrane hollow fibers.

The 6,250 Nm3/h capacity nitrogen generator produces 95 percent nitrogen purity was delivered to M/T Millenni- um Explorer, a 98,000-dwt methanol tanker, built at Namura Shipyard in

Japan. The nitrogen will be utilized for cargo-protection during sea voyage, as well as during cargo discharge.

Circle 36 on Reader Service Card

PropacRudder Benefits Confirmed In Service

Wartsila NSD has recently completed shipboard trials with the new Wartsila

NSD PropacRudder. and results are promising, according to the manufacturer.

The innovative propulsion system, originally introduced a little more than a year ago, was designed to reduce propulsive power requirement, with reduced hull vibration and noise, while providing for exceptional maneuverability. The trials, undertaken last October and November aboard the 5,175-dwt paper carrier Lys- birs, reportedly confirm all of this. Norwegian owner Lys-Line AS of Oslo was the willing test partner (it should be noted that Norwegian owners are renowned for their willingness to work with the industry in the proving of new concepts), and the vessel was equipped with a Propac propulsion package, which consisted of a 6,300 kW Wartsila 6L46C medium speed diesel engine, a 4.5 m diameter

Wartsila CP propeller, gearbox and PropacRudder. The PropacRudder's signa- ture is its streamlined torpedo shaped bulb on the rudder horn. The bulb is designed to ensure a more homogeneous water flow both in front of the propeller and in the propeller slipstream. The bulb is designed to increase propulsion effi- ciency via a wake gain effect, meaning that it reduces the water speed into the propeller so that less power is needed to produce the same thrust. The bulb also has been shown to reduce propeller-induced hull noise and vibration by elimi- nating hub vortices and separation, and cavitation behind the propeller hub col- lapsing on the propeller. While model tests showed that solely by applying the

PropacRudder. the presence of the bulb gives a large reduction in power of about 10 percent for the same ship speed compared to using conventional flap rudders, the full-scale trials actually demonstrated an even greater power savings. It was noticeable during the trial on Lysbris that propeller-induced noise level is very low right across the range of pitch settings with constant propeller revolutions, without any noisy face cavitation or local hull vibration problems. Also of note was the vessel's maneuverability, particularly during low-speed operation and in restricted waterways. At low ship speeds, event in high winds and fast currents, the vessel was kept under control. In the trial, it was found that the ship can be maneuvered safely at speeds down to just one knot, even in strong currents. The next vessel to enter service with the PropacRudder is the 14,000-dwt chemical tanker Jo Laguna D from Italy's De Poli Yard.

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Ext. 7363 20900 West Ireland Road • P.O. Box 2919 • South Bend, IN 46680-2919 12 Circle 214 on Reader Service Card Maritime Reporter/Engineering News