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.
National Fisherman Live: 3/10/15
In this episode, Online Editor Leslie Taylor talks with Mike McLouglin, vice president of Dunlop Industrial and Protective Footwear.
National Fisherman Live: 2/24/15
In this episode:
March date set for disaster aid dispersal
Oregon LNG project could disrupt fishing
NOAA tweaks gear marking requirement
N.C. launches first commercial/recreational dock
Spiny lobster traps limits not well received
NMFS announced two changes in regulations that apply to federal fishing permit holders starting Aug. 26.
First, they have eliminated the requirement for vessel owners to submit “did not fish” reports for the months or weeks when their vessel was not fishing.
Some of the restrictions for upgrading vessels listed on federal fishing permits have also been removed.Read more...
Alaskans will meet with British Columbia’s Minister of Energy and Mines, Bill Bennett, when he visits Juneau next week and will ask him to support an international review of mine developments in northwest British Columbia, upstream from Southeast Alaska along the Taku, Stikine and Unuk transboundary rivers.
Some Alaska fishing and environmental groups believe an international review is the best way to develop specific, binding commitments to ensure clean water, salmon, jobs and traditional and customary practices are not harmed by British Columbia mines and that adequate financial assurances are in place up front to cover long-term monitoring and compensation for damages.Read more...