Built in 2017, by Horizon Shipbuilding Incorporated of Bayou LaBatre, Alabama (hull #186) as the Rosemary McAllister for the McAllister Towing and Transportation Company of New York, New York.
In 2018, the uncompleted tug was moved to Eastern Shipbuilding Incorporated of Panama City, Florida (hull #224). Where construction was completed.
Named for Rosemary McAllister. Mother of McAllister CEO Buckley McAllister, and CFO Eric McAllister. And wife of fourth generation McAllister Towing President, Brian A. McAllister.
She was the thirteenth tug designed by Jensen Maritime Consultants of Seattle, Washington for McAllister Towing and Transportation.
The Rosemary McAllister was the thirty-fourth tractor tug to enter service for McAllister Towing and Transportation.
Powered by two, sixteen cylinder, Tier IV complaint, Caterpillar 3516E diesel engines. With Lufkin MV1600S gears, at a ratio of 2:1. With Schottel SRP 4000 FP z drives, for a rated 6,770 horsepower.
Her electrical service is provided by three, 118kW, Tier III compliant, Caterpillar generator sets. Driven by three, keel-cooled, Caterpillar C7.1 diesel engines. The tug's capacities are 58,710 gallons of fuel, 545 gallons of lube oil, 2,500 gallons of urea, 1,444 gallons of of waste oil, 3,075 gallons of potable water, and 750 gallons of foam water.
She is outfitted with two, 1,200(lb), FFS fire monitors. Rated at 5,284 gallons per minute, with adjustable fog tips, and foam capabilities, and a deluge system. Fed by two FFS SFP 250x350 fire pumps, rated at 5,980 gallons per minute. Driven by two, Tier IV compliant, Caterpillar C18 diesel engines, rated at 831 horsepower.
The towing equipment consists of a Markey, asymmetric, render-recover, winch mounted on the bow. And, a Markey towing winch, outfitted with 2,500(ft) of 2.25(in) towing wire on the stern.