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Great Lakes Fleet Page Vessel Feature -- Dorothy Ann
The 124-foot, 7,200-horsepower Z-drive tug Dorothy
Ann was designed by Ocean Tug & Barge Engineering of Bellingham, Massachusetts. Hull construction began at Bay Shipbuilding Company, Sturgeon Bay, Wisconsin, on January
1st, 1998. The tug's hull, including main engines and Z-drives, was delivered on September 16th, 1998, and towed out of Bay Shipbuilding's drydock to Escanaba, Michigan. Final outfitting was performed by Bark River Towing of Escanaba, Weld All of Menominee, Michigan, and Marine Accommodations of Jacksonville, Florida.
Dorothy Ann is the largest Z-drive tug built to date in North America. Her twin Z-drives enable her to turn on her own axis, stop within her own length, and move easily in any direction. Coupled with barge
Pathfinder the pair is the most maneuverable unit on the Lakes. Alone,
Dorothy Ann can travel at 16 mph when pushing the loaded barge, open lake speed is 11.5 MPH.
Dorothy Ann is fitted with a Great Lakes-specific articulated pin-type connection system for engaging Pathfinder's notched stern. A pair of hydraulic rams project from the sides of the tug's bow and lock into receptacles in the barge's stern.
Dorothy Ann is outfitted with
state-of-the-art navigation and communication equipment. Her elevated pilot
house has a height of eye of 70 feet, and the vented tower was designed to
spoil trailing air drafts. Accommodations include air-conditioned private
cabins with semi-private bathroom facilities for 14 crew members, a lounge,
and an owner's stateroom.
|Horsepower twin Z-drive