Hockema-Platypus Limit-Seiner

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Cummins Vessel Reference #681

Hal Hockema-designed Alaka Limit seiner 58x25-feet Cummins QSK19-M power 750 HP, Nautican Nozzle

Platypus Marine in Port Angeles are building a sister-ship to a Hal Hockema-designed Alaskan Limit that the owner, Adamant Fisheries, had build in 2009.

But the history of successful designs is one of evolution. So the new boat will be the same beamy 58 by 25 feet with a 12.5-foot draft. The boat has a massive 3100 cubic feet capacity in three holds. RSW for the holds is provided by two 18-ton chillers. The engine is set well forward in the hull to maximize space available for the holds. As with the earlier vessel there will be extensive use of stainless throughout from the sides where gear is retrieved, the trawl ramp and all fittings above the deck. The hatch combings are also stainless.


left to right: Justin Huff, Charlie Crane, Judson "Jud" Linnabary

Project manager Justin Huff explains that the most significant difference with this boat is the use of a Nautican nozzle with triple shutter rudders. The nozzle will add towing power and speed while the triple rudder system will give great maneuverability. Another difference from the first vessel, are the rolling chocks. The boat’s 25-foot deck beam tapers slightly to become about 21 feet at the chine. This allows for the installation of 17-inch rolling chocks angled directly out from the chine for maximum effectiveness but still protected by the vessel’s full beam. For added strength the rolling chocks are formed from two pieces with additional internal framing. The void will be filled with vegetable oil and the outer edge will be formed from a 1 1/2-inch solid stainless steel round. “We have noticed too many bent rolling chocks on boats that come in for repair,” Huff said to explain the sturdy construction of these extensions.


Hal Hockema-designed Alaka Limit seiner in build at Platypus Marine.

The new boat will use the same proven Cummins QSK19-M main engine, but this one will be rated for 750 HP while the earlier one produced 600 HP. Supplied by Tri-County Diesel Marine of Bellingham, the engine will turn 30-feet of shaft through a Twin Disc gear with 5.95:1 reduction. The 5.5-inch shaft will be in two parts with the line shaft being steel and the tail shaft stainless. The propeller, with very fine tolerance to the nozzle, is about 56 inches. The boat is also fitted with a bow thruster.

Auxiliary poser includes a 65 kW set and a 30 kw hotel set. Huff explains that from the owner’s perspective the design focused on efficiency. With pride he adds that from the yards perspective the emphasis was on quality, “I have written procedures and trained three shipyards to ABS fitting and welding standards,” he explained, “And this boat, while not certified, is being built to those same ABS standards.”

Accommodations are in the raised fo’c’s’le with the large aluminum wheelhouse having port and starboard control stations with an additional aft station in the wheelhouse with controls for the troll warps. The versatile boat will be outfitted for trawl, seine and pot fishing options. Stainless steel pedestals will be installed on deck for both trawl winches and a purse winch.


For further information:

Marty Marchant
Director of Sales and Marketing
Platypus Marine, Inc.
102 North Cedar Street
Port Angeles, Washington 98363
Phone: 360 808 4303
Email: [email protected]
Web: www.platypusmarine.com

Rich Murday
Account Manager
Cummins Northwest, Inc.
811 SW Grady Way
Renton, WA 98057 2944
E-mail: [email protected]
Phone: 425 277 5329

Mike Rusk
Tri-Country Diesel Marine
2696 Roeder Ave.
Bellingham, WA 98225
Phone: 360 733 8880

Alan Haig-Brown

Alan Haig-Brown

Over 30 years as an author for global commercial marine and fishing publications backed with hands-on experience on commercial fishing boats and coastal freighters makes Alan Haig-Brown uniquely qualified to provide vessel reference articles for Cummins Marine. You can find him in shipyards around the world, and on his own website, www.haigbrown.com.

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