Written by Jen Finn
With diesel-electric and Z-drives, this 184-foot Bering Sea longliner sets a standard for efficiency
By Michael Crowley
"The original design started off as a conventional single-screw drive," says Ron van den Berg with Jensen Maritime Consultants in Seattle. If the boat's owners had followed through with that type of propulsion, the $25 million Northern Leader, which was built at J.M. Martinac Shipbuilding Corp. in Tacoma, Wash., wouldn't be generating nearly the interest that it is and wouldn't have such a high price tag.
A "single-screw drive" is a diesel engine matched up with a marine gear and — on this 184-foot longliner — a hefty drive shaft to spin a good size prop. It's not an unusual arrangement, and excluding a few boats with water jets, probably every fishing boat built in this country over the past 45 years has been powered that way.
But when the owners of Alaskan Leader Fisheries, which operates three other conventionally powered longliners, decided to ditch the initial concept and look for another form of propulsion, things got interesting. It set the stage for the owners of the Northern Leader to be at the forefront of a different type of propulsion for larger U.S. fishing boats.
What's unusual about the 184' x 42' x 18' 7" Northern Leader is that it has diesel-electric generators powering a pair of Z-drives. Diesel-electric propulsion is not unheard of on commercial fishing boats, but the last fishing boats in this country to be powered with diesel-electric drives were built in 1968 at Maryland Shipbuilding & Drydock in Baltimore.
They were the Seafreeze Atlantic and the Seafreeze Pacific, both 285-foot trawlers The boats were billed as the country's first factory trawlers. United States Seafoods in Seattle purchased the Seafreeze Atlantic in 1998, when it was known as the Arctic Trawler, and now operates her as the Seafreeze Alaska. American Seafoods Co. in Seattle bought the Seafreeze Pacific in 1997 — then the Royal Sea — and renamed her the Katie Ann.
Prior to that, a number of diesel-electric trawlers were built from about 1928 into the 1950s. But the technology hadn't developed to the point that it was feasible for fishing boats. Maintenance was always an issue — hang a net up, and you could burn up an electric motor — and some of the components were too large and not suitable for the marine environment, having been salvaged from locomotives.
Legislators from Connecticut and Massachusetts complained about the current “out-of-date allocation formula” in black sea bass, summer flounder and scup fisheries in a letter to the U.S. Department of Commerce earlier this week.Read more...
The Southeast Alaska Fishermen’s Alliance recently announced that the National Marine Sanctuary Foundation has awarded the organization a Hollings Grant to reduce whale entanglements in Alaska salmon fisheries by increasing the use of acoustic whale pingers to minimize entanglements in fishing gear.