Propulsion Profile: US Navy’s Tier 4 Tugs

Built by Dakota Creek Industries in Anacortes, Wash., the first of the U.S. Navy’s new fleet of six YT 808-class tugs was delivered in October after completing the last construction phase. Measuring 90 feet long and 38 feet 3 inches wide, the YT 808 vessel is powered by twin Cat 3512E marine engines, each rated at 1,810 horsepower. The engines drive two Schottel SRP 340 fixed-pitch z-drive thrusters providing a top speed of 12.5 knots and an expected bollard pull of 40 metric tons.

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