Page 10: of Maritime Reporter Magazine (February 2000)

Investment in Design

Propeller Milestone Achieved By U.S. Navy some of our current U.S. based

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The U.S. Navy's drive during the past decade to become more efficient on both the ship contracting and life cycle man- agement sides has proven to be much more than mere talk. The "new" Navy is embodied in the current LPD-17 project, and U.S. Navy senior officers and engi- neers recently marked a critical mile- stone in ship research on January 6, 2000, wrapping up a successful phase in the testing of a full-scale propeller for the USS San Antonio (LPD-17) Class amphibious transport dock ship.

The tests verify that a new compact design for the LPD-17 CPP meets the seven-year service life cycle require- ments. The 17 million cycles completed at the ceremony show that this new design exceeds requirements and that the service life could be extended twofold.

This Naval Sea Systems Command program could lead to a significant sav- ing for the Navy in overhaul costs for the new propeller. The hub and blades, man- ufactured of nickel-aluminum-bronze and steel, constitute a unique design. The hub has a smaller diameter than in the past, leaving less surface for attaching the five blades and increasing stress in the blade root area and the hub. Verify- ing the new design will facilitate extend- ing the period between overhauls from seven to 14 years, producing lower costs, easier maintenance and faster upgrades — an affordable propeller with enhanced performance reflecting the fiscal con- straints of the modern Navy.

Carderock propeller experts working with the Bird-Johnson Company, the hub designer and prop fabricator, designed the blades. Small scale prop models were then tested in another unique

Carderock facility, the Large Cavitation

Channel, in Memphis, Tenn. There, scaled props are mounted on ship model hulls where the flow of water over the hull and around the prop is the same as a real vessel at sea.

LPD-17 propeller testing supports the shipbuilder, Avondale Industries Inc., (Continued on page 12)

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