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thousands of feet of water at high speeds. Well beyond the capability of band or disc braking systems, this duty calls for one or more of the water-cooled retarder units with pumps and heat exchangers to han- dle several hundred gallons per min- ute of fresh water. Increasing so- phistication in instrumentation, alarms, and "set-point" automatic override systems will be required. Handling rig chains with these large combination machines is facil- itated by the newly patented MMCO Multi-Cat that provides six- pocket wildcats with readily re- placeable inserts to accept a range of chain sizes. The vessel can oper- ate with a variety of chains without major wildcat changeout. Practical winch-powering systems include the 300- to 600-bhp diesel engines with torque-converter transmissions, and the 500- to 1,000-hp electrical SCR-dc drives— particularly appropriate aboard the SCR-propelled vessels. This class of machinery is so large and heavy that each unit will have to be layed out to suit the deck space for a particular vessel. As electronics establishes that it can stand the marine environment for extended periods of years, many more applications will be seen, such as remote anchor dropping on barge windlasses, servo-controlled re- search winches, and greater levels of safety back-ups on the deep-water anchor-handling machines. Deck machinery remains an endeavor where new requirements, new ar- rangements, and new capabilities prevent efforts at standardization from taking greater hold. For additional information, Circle 38 on Reader Service Card NABRICO An all-new electric winch de- signed for long life, easy mainte- nance and dependable service and an "easy-to-get-off" cast utility twist lock flush hatch are among the latest developments from Nashville Bridge Company (NABRICO) of Nashville, Tenn. The electric winch is designed for use on towboats or for any sort of intermittent winching operation re- quiring a large holding capacity. It has a 10-ton pulling capacity and a 40-ton holding capacity. An oversized brake ensures that the NABRICO winch will hold its rated capacity of 40-tons. And a back-up mechanical locking paw can be used to hold the rated capac- ity in case of brake failure. The NABRICO electric winch has a free- wheeling feature to allow faster ca- ble pull out. Ball bearings on the highspeed shaft and the precision machining of the side plates and shafts add to the overall efficiency of operation and life of the electric winch. The winch is powered by a 5-hp motor. It requires only a simple power lead connection to begin op- eration. All necessary controls are supplied by NABRICO with the winch. In addition, the company stocks all replacement parts to en- sure customers minimal down time should any repairs become neces- sary on the electric winch. The new cast twist lock flush hatch is designed especially for use by companies involved in the trans- portation of solid materials, such as rock and gravel or coal. Suitable for any hopper or deck barge applica- tion, the cast hatch is sturdy, dura- ble and easy to maintain. Its simple twist lock operation ensures that the hatch will remain easy-to-get-on- and-off for many years. With plants in Nashville and Ash- land City, Tenn., Nashville Bridge Company is a major supplier of ma- rine deck hardware to the entire marine industry. The company pio- neered in the design and construc- tion of much of the modern equip- ment used on rivers today. For additional information, Circle 39 on Reader Service Card NATIONAL CRANE National Crane's pedestal- mounted cranes are cost-efficient lifting systems for shipboard, dock- side, and other marine uses. A wide selection of boom lengths and ca- pacities are available from the 28- foot reach and 10,700-pound capa- bilities of the Marine 200 to the 75- foot length and 34,000-pound maxi- mum capacity of the 800. A new addition to National's al- ready popular line of marine equip- ment is the 400, a medium-duty crane with lighter boom sections and increased capacity. (continued on page 42) THIS \ YOU DOI\I T; (J) Trademark Of THOMSON-GORDON LIMITED WAUKESHA BEARINGS CORPORATION P.O. Box 798 Waukesha, Wisconsin 53187 USA Telephone: (414) 547-3381 /Telex: 26759 Circle 241 on Reader Service Card JAKOBSON SHIPYARD BUILDERS OF FINE VESSELS SINCE 1898 \ ff't 119 Ft. Stern Trawler JAKOBSON SHIPYARD INC. OYSTER BAY, N.Y. 516-922-4500 11771 P.O. BOX 329 TUGS FERRIES FIREBOATS SKIMMERS FISH BOATS EXCURSION BOATS CREW BOATS SUPPLY BOATS SPECIALTY CRAFT All Jakobson built and in service worldwide from Bahrain to Venezuela. Steel, Aluminum, Fiberglass Ways to 230 ft and 1500 tons Let us build to your design or take Turnkey responsibility. Full Repair & Dry Docking Facilities Repowering—Major Overhauls For years, boat operators all over the world believed that a longer shaft bearing meant a better shaft bearing. But not any more. Not since the new Thordon COMPAC bearing proved that the right combination of bearing material, groove design, and length/ J diameter ratio can save time and money for every fi i vessel on the water. : - - - 'We started with the toughest, most silent * Wfff If IHWlllliiimr running bearing material available. THORDON SXI. Up against rubber or other non-metallics, orange THORDON SXL leads the field in dry running ability resistance to oil and installation ease Then we redesigned the grooves, actually using half as many as normal, providing an improved hydrodynamic layer of water between the bearing and the shaft surface. Finally, we made the most dramatic change of all We shortened the bearing length by almost half And guess what? The new Thordon COMPAC bearing design actually worked better than the normal full-length bearing How much better? This much The new Thordon COMPAC installs faster is more tolerant of misalignment reguires less torque and horsepower drag and still lasts as long or longer than regular bearings! If you're serious about cutting your vessel's repair costs while improving performance and reducing noise, fake a look at the shaft bearing design of the future — the new Thordon COMPAC COM LESS IS MORE October 1, 1984 Circle 217 on Reader Service Card 61
