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THE ONLY EVACUATION SYSTEMS THAT ARE US CUAST GUAIU APPROVED. Evacuation Slide System. Designed specifically for Low Freeboard Ves- sels, it is a combination slide and platform. It provides speedy evacuation for all passengers - young, old and physically challenged. US Coast Guard Approved. Evacuation Chute System. The most efficient, easy-to-use, flexible, and cost-effective marine evacuation system avail- able in the world. It evacuates passengers and crew in the shortest possible time. Manufactured to meet or exceed all SOLAS requirements. US Coast Guard Approved Circle 342 on Reader Service Card We manufacture the only US Coast Guard approved single 100 person Reversible Inflatable Platform. These sturdy platforms are designed for pas- senger carrying vessels operating in protected waters. Fully reversible - it offers instant board- ing, which ever way it inflates. Also available in 10, 25 and 50 person sizes. A division of Dunlop-Beaufort Canada Ltd. OUC MARINE SAFETY SYSTEMS | 101-3760 Jacombs Road, Richmond | British Columbia, Canada V6V 1Y6 Ph. (604) 278-3221 Fx. (604) 278-7812 1-800-931-3221 sales@dbcmarine.com www.dbcmarine.com Circle 264 on Reader Service Card PROPULSION UPDATE (Continued from page 40) Noise Performance Comparison - DDG 51 All GE MRG's are factory-tested by GE to help ensure that perfor- mance and noise requirements are met. DDG 51 MRG testing is per- formed in a back-to-back configura- tion with hydraulic torque appli- ers. The test configuration includes the actual shipboard isolation sys- tem attached to a test foundation which represents the specified ref- erence foundation. The estimated noise performance of the DDG 51 MRG was obtained by applying adjustment factors to measured noise performance data obtained from GE's extensive noise data- base. Figure 1 presents the esti- mated hard-mounted performance of the DDG 51 MRG for one of the specified test points. These esti- mates were made early in the DDG 51 design phase, and indicated that an isolation system would be required to satisfy the noise crite- ria. With consideration to the ship mission requirements and the mounting system trade-offs pre- sented in Table 2, a metallic isola- tion system was selected. Figure 2 presents estimated DDG 51 foundation vibration levels for the isolated system. Also pre- sented in the figure are the average vibration levels measured directly above and below the isolation sys- tem. These curves illustrate that: Excellent agreement exists between the estimated and mea- sured vibration levels, yielding con- fidence in the noise estimation process; The isolation system has excellent overall attenuation char- acteristics; and The average foun- dation vibration levels measured during factory testing were at least 18 dB below the criteria, with lev- els of approx. 60 AdB or less throughout the entire frequency range. Based on these results and extensive experience in the design, manufacture and testing of naval propulsion gearing, GE will pro- duce at minimum program risk the low noise, high power density, oper- ational flexibility, reliability and performance needed to satisfy 21st century Naval ship mission requirements. The preceding was excerpted from a paper presented by James J. Luz and Douglas A. Boyle — both senior engineers — Advanced Gear Technology for GE - Marine Products Department. 64 Maritime Reporter/Engineering News SHIPYARD INC. SINCE 1979 New Iberia, Louisiana 70562 GEO MARINE INC. Boat Sales Marine Supplies Cummins Diesels Northern Lights Generators Suzuki Outboards Repair Rentals Marine (318) 367-6063 Fax (318) 369-7088 Hwy. 90 East P.O. Box 9377 GEO SHIPYARD INC. New Construction Conversions Water Jet Installations Repair Services Marine Travelift Blasting & Painting Shipyard (318) 367-1541 Fax (318) 364-7493 Port of Iberia P.O. Box 9622