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Philadelphia Gear Furnishes Gear Drive For World's Most Powerful Icebreaker When the 400-foot, 12,000-ton icebreaker Polar Star goes into service for the U.S. Coast Guard next year, it will foe outfitted with three Philadelphia Gear 20,000-hp marine gear drives weighing 220,000 pounds each. The unique ves- sel, under construction at Lockheed Shipbuild- ing and Construction iCo., Seattle, Wash., will have 1 Yz times the power oif the Soviet Union's Lenin, presently the most powerful icebreaker afloat. Philadelphia Gear Corporation has re- cently received an order for three more propul- sion gears lor a sister ship, with delivery in the 1973-74 production schedule. in order to assure meeting the extreme load and speed conditions. First, both static and dynamic clutch tests were initiated, including simulated dead shaft pickups. Other important tests included a 24-hour full-load test with the torque locked in at 3,600 rpm, and a spin test 20 percent over the maximum rated speed of 4,320 rpm. The 400-foot 12,000-ton U.S. Coast Guard icebreaker Polar Star will be outfitted with three Philadelphia Gear 20,000-hp marine gear drives weighing 220,000 pounds each. The triple-screw propulsion system on the Polar Star, with each shaft powered by a Tur- bo Power & 'Marine Systems gas turbine, will develop a total of 60,000 shaft horsepower in ioebreaking configuration. This is enough to break ice six feet thick continuously or to ram through 21 feet of ice. Philadelphia Gear de- signed the double reduction locked gear trains large and sturdy enough to be able to with- stand the extreme service demanded—200 per- cent torque loading during low-speed icebreak- ing and 250 percent torque or a peak load of 50,000 shaft horsepower for one-second cycles. The company used vacuum degassed alloy steel 'forgings which were specially heat-treat- ed to rigid standards so they would assure the high strength of teeth and core needed to han- dle the severe loading. Among the gears in each icebreaker drive was a 20-ton bull gear 135 inches in diameter. Philadelphia Gear subjected the three ice- breaker gear drives to a rigorous test program Philadelphia Gear designed the double reduction locked gear trains large and sturdy enough to be able to with- stand the extreme service demanded—200 percent torque loading during low-speed icebreaking, and 250 percent torque or a peak load of 50,000 shaft horsepower for one-second cycles. Dynamic balancing one of the three 20-ton bull gears for the icebreaker drives. Each gear was 135 inches in diameter and was tested to specification Mil-Std-167. EQUITABLE-BUILT BAUXITE BARGES: Equitable Equip- ment Company, Inc., New Orleans, La., has delivered the last two of three bauxite barges under a $1-million con- tract by Aluminum Company of America for the account of Suriname Aluminum Company. The new barges, shown above, identical to one built in late 1970 for the same interests, have overall dimensions of 195 feet by 50 feet by 17 feet. They were built at Equitable's Madisonville, La., shipyard. The new bauxite barges are of the open hopper type of double-skin construction with loaded drafts of 16 feet. The cargo compartments of each is 120 feet long, 40 feet wide, and 18.5 feet high to the top of the coaming. Heavily constructed, the barges are designed to provide containment for a cargo density of 125 pounds per square foot, as well as to withstand the pounding of clam shell unloading methods. Electro-Nav, Inc. Named U.S. Distributor For Ericsson Marine Radio Equipment Robert E. Negron, president of Electro-Nav, Inc. of 501 Fifth Avenue, New York, N.Y., has announced its recent appointment as exclusive United States distributor for the Ericsson line of marine radio equipment manufactured by the Elektrisk Bureau Division. The EB 1500 Radio Station was introduced at the recent Mariport Show held at the Ameri- cana Hotel in New York City, and the OTC Show in the Astro Hall, Houston, Texas. Mr. Negron stated that it will enhance its cur- rent line of electronic equipment, which includes radars from Decca, satellite navigation and dop- pler from Magnavox, radiotelephones from Motorola, clear view screens from Speich, colli- sion avoidance from Automated Marine Inter- national, and many others. The EB 1500 features a 1,500-watt synthesized transmitter which offers worldwide voice and wireless contact from the operator's office direct- ly to the vessel. This equipment is currently on the QE 2 and the new Norwegian cruiseliner Vistaf jord, as well as the newer tankers and freighters, totaling over 250 vessels at sea today. 1. UNLOCK 2. OPEN TIME: 30 Seconds Memarco Rapid Action Deck Cover The quick, simple way to seal deck openings. Forget about cumbersome studs and nuts. Our Rapid Action Deck Cover locks and un- locks in seconds. It fits a standard 121/2" open- ing and is adjustable to any deck plate thick- ness up to 3". All bronze construction makes it non-spark- ing. Buna-N seal makes it watertight. And, best of all, its removable, special wrench makes it theft proof. Throw away your old steel plate covers and try ours. You won't be sorry. MECHANICAL MARINE CO., INC. 900 Fairmount Avenue Elizabeth, New Jersey 07207 Phone: (201) 351-5400 July 1, 1973 29
