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Displacement Hulls

Transonic Hull Technology for Offshore Vessels

Hydrodynamics theory establishes that wave making resistance of displacement hulls originate from their body shape, especially from shoulders, midbody, and rear quarter curvatures of their waterplane at the water-air interface.  These curvatures create bow waves, midbody troughs, and stern waves, which set the “hull speed” limit when the distance between bow and stern wave equal the boat’s length (speed/length ratio 1.34).  Above hull speed, resistance grows at a high exponential rate.  Transonic Hull (TH) technology eliminates this problem by using a slender triangular waterplane with apex at the bow, and rectilinear sides, free of curvatures, extending from bow to a maximum beam at the stern.  This shape also generates the sharpest possible entry angle at the bow.


Kadey-Krogen 52’ Hull Scheduled for Debut

Krogen 52 Hull

Kadey-Krogen 52’ Hull Number One Scheduled for World Debut in Seattle Boats Afloat Show, Sept. 14-18. Hull number one of the new Krogen 52’ departed Asia Harbor Yacht Builders in Kaohsiung, Taiwan on August 22 and is set to make its international debut in the Seattle Boats Afloat Show on Lake Union from September 14-18. The premiere comes just 18 months after the announcement of the new model. Testimony to the Kadey-Krogen tagline “At Home on Any Sea


Trinity Delivers M/Y Lady Michelle

Lady Michelle is a semi-displacement hull design with 28 ft. (8.5m) beam and is capable of 19 knots and is powered by two Caterpillar 3512B main engines which develop 2,250 hp each. The shallow draft of 7.5 ft., enabling it to gain access to many ports uncommon for a yacht of this size. A 16,100 gallon (62,460 L) fuel tank will allow a large cruising range of approximately 4,200 nm at 10 knots (with 10% fuel reserved).


Foreign Flagged Ferry for Pacific NW Route

The Washington State Department of Transportation Ferries Division, operating as Washington State Ferries (WSF) issued this Request for Information (RFI) to determine the availability of a foreign flagged ferry for an international ferry route, as follows:    WSF is the world’s largest ferry system based on the number of vehicles carried each year and the third largest in the world based on the 23,000,000 passengers served each year


Sauter Carbon Offset Design presents the Champion of Green Power

Arch Angel LSV at sea.jpg

Faster and far greener than any Megayacht in her class, a Carbon Neutral Emax Megayacht that maximizes ecology, energy, efficiency and  economy to achieve a 50 to 100% reduction in fuel consumption and GHG emissions. The Ark Angel features the only compound engines other than the Curtiss Wright Cyclone to ever go into production, the Daimler Bluetec Turbo Compound DD 16 Employing the Daimler EPA “on road” turbo compound engines


New Pilot Boat Soon to Launch in Oregon

The pilot boat Connor Foss under construction.

Seattle - The pilot boat Connor Foss is currently under construction at the Foss Maritime Company's Shipyard in Rainier, Oregon, and will replace the Arrow 2 in June, 2012. The Arrow 2 will be taken out of service after fifty years transporting River and Bar pilots on the Columbia River at Astoria, Oregon.  The Arrow 2 began service on the Columbia River in 1962. The steel hull launch boat with a single 700 horsepower engine has made thousands of pilot transfers in its long career.


What Hull Shape Is Best?

Back at the dawn of maritime history, a coastal dweller first took a log and ventured out on the water. Over time his craft evolved from a rough log to one that had shape at the ends and was hollowed out. These changes to the basic log shape were the first example of modifying a hull form to increase carrying capacity, improve ride comfort, and to reduce resistance. Since then, shipbuilders, naval architects, and ship owners have experimented with hull shapes and the number of hulls to find


SkipperLiner Introduces 'Pride of Cassville'

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SkipperLiner of LaCrosse, WI, recently launched a passenger/vehicle barge and towboat ferry. Here are her particulars: BARGE LOA: 78’ Beam: 32’ Hull Depth: 5’0" Draft (clearance): 3’6” Hull Thickness: 5/16" (sides) 3/8" (deck) 5/16" and 3/8" (bottom Displacement: 74.08 long tons Certification: USCG TOW LOA: 45’ Beam: 16’ Hull Depth: 6’0" Draft (clearance): 4’6” Gross Tons: Less than 100


New Fireboat Delivered to MassPort

Fireboat American United

In October 2011, the new RAnger 2400 Class Fireboat, American United was delivered to the Massachusetts Port Authority by the builder A.F. Theriault & Son Ltd.   The vessel, named in remembrance of September 11, 2001, was designed by Robert Allan Ltd. of Vancouver, B.C., who worked closely with the Owner to define the vessel's specific operational requirements. The American United will replace Massport's existing vessel Howard W. Fitzpatrick, built in 1971. Darren Hass, P.Eng


Jensen to Design Fireboat for San Francisco

Depiction: Jensen Design Custom Super Pumper Fireboat

Fireboat to be Equipped with Six Fire Monitors and 26 Manifold Valves for High-Volume Water and/or Foam Firefighting.     Jensen Maritime Consultants, Inc., a Crowley company, has been chosen to design a custom "super pumper" fireboat to enhance the City of San Francisco Fire Department's (SFFD) marine fire fighting and response capabilities on water.   This high-volume water and foam pumping NFPA Type II fireboat will feature six fire monitors and 26 manifold


MN 100: All American Marine, Inc.

President /CEO: Matt Mullett

The Company: All American Marine Inc. was founded in 1987 and specializes in the construction of custom tailored aluminum boats from 30 to 150 feet LOA. Today, the company has become a leading builder of high speed passenger catamarans, survey craft, and research vessels


Fouling Release Boosts Hull Performance

Bulk carrier being sprayed with Duplex in Chinese yard

A silicone coating that keeps hulls free of marine growth while boosting the vessel’s performance and fuel economy will be featured on the Fujifilm Smart Surfaces stand at Marine Maintenance in Antwerp.   The Duplex fouling release system was developed by the U.S


Miss Berdie Gets a Makeover

The new Miss Berdie maintains her graceful lines.

 When she came into the Fred Wahl shipyard in Reedsport, Oregon, the Miss Berdie was a fine looking boat with a bright red hull. When she left the yard this summer she was still a fine looking red vessel but bigger and better. After taking the 77 by 27.8 by 11


New Cutter Suction Dredge: Modern and Efficient

Image: Ellicott Dredges

Ellicott Dredges, LLC has debuted a new design 20” (500 mm) cutter suction dredge, the Series 2070 Dragon dredge.    Aiming to take advantage of modern, up-to-date technology and advanced design techniques, the new dredger unit will eventually replace the Series 1870 Dragon as


World Refugee Crisis to Worsen with Climate Change

David Miliband Photo by International Rescue Committee

  A historic 52 million people are fleeing conflict worldwide, a trend that will intensify over the next two decades because of climate change, International Rescue Committee chief David Miliband said on Friday. "One of the drivers of displacement and potential conflict over the next


SSI Hosting Two ShipConstructor Webinars

SSI, a developer of software products for shipbuilding engineering and construction, reports its ShipConstructor Structure Webinar, previously scheduled for June 3, has been rescheduled for July 8, 2015, 8 a.m. (PDT).   Structure offers rapid 3D production detailing of internal hull


Navatek, NEB Launch Sea Blade 35

The Sea Blade 35 is put through its paces on Narragansett Bay, May 29, 2015 (NavatekNEB photo).

  Navatek, the naval research and design company based in Hawaii and Rhode Island, and NEB, a leading builder of high-tech composite and aluminum boats based in Portsmouth, R.I., announce the launching of the Sea Blade 35, a 35-foot rigid hull inflatable boat (RIB) with a top speed of 60


DNV GL, Jotun Cooperate on Hull Performance

From left to right: Dr. Torsten Büssow, DNV GL’s Head of Fleet Performance Management; Albrecht Grell, Director of the Maritime Advisory division at DNV GL; Geir Boe, Vice President Marine Coatings at Jotun; and Stein Kjølberg, Global Sales Director, Hull Performance Solutions at Jotun.

DNV GL and the Norwegian paint manufacturer Jotun signed a cooperation agreement to work on improving hull performance at Nor-Shipping today. The project will bring together two performance management services, Jotun’s Hull Performance Solution and DNV GL’s ECO Insight solution


Blyth Workcats Wins ABP Survey Boat Contract

Blyth Workcats 14m survey boat to be built for ABP

  At the Seawork International Exhibition in Southampton, Blyth Workcats Ltd announced that Associated British Ports (ABP) has awarded it the contract for a new 14-metre survey vessel to be built at the company’s yard on Canvey Island, Essex, UK.


Jotun to Update Performance Guarantees

The 17 National Standardization Bodies represented on ISO’s Marine Environment Protection Sub-committee (ISO-TC8-SC2) has voted in favor of circulating ISO 19030 parts 1 and 2 as Draft International Standards. In anticipation of final approval of the standard expected next year


UK Navy’s Ice Patrol Ship Gets a New Coating

On December 2, 2013, HMS Protector conducted a base inspection on the Ukrainian Vernadsky Research Base. The base was renamed Faraday Station in August 1977 in honor of British scientist Michael Faraday until Ukraine took over the operation of the base in February 1996. (Photo: UK Defense)

U.K. Royal Navy Ice Patrol Ship HMS Protector is deployed on operations for 330 days a year, mostly in the Antarctic region, making it essential that her underwater hull is protected against the harsh icy conditions she faces.   At the end of May


Danish Ports Approve HullWiper

Photo: GAC EnvironHull

Authorities at the Danish ports of Copenhagen, Kalundborg and Fredricia have granted permission for GAC EnvironHull’s pioneering, diver-free, underwater HullWiper solution to be used within their ports and outside of holding areas.  


ClassNK Releases New PrimeShip-HULL Software

New version of ship design software

  ClassNK has released PrimeShip-HULL (HCSR) Ver. 2.5.0 in response to the new IACS Common Structural Rules for Bulk Carriers and Oil Tankers (CSR BC & OT).   CSR BC & OT, which harmonizes requirements found in both existing Common Structural Rules for bulk carriers and double


13 Yr Old Medevaced Off Peddocks Island, Boston Harbor

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  A Coast Guard rescue crew, accompanied by two Hull Emergency Medical Services technicians, medically evacuated a 13-year-old male Wednesday at about 7:30 p.m. from Peddocks Island, one of the Boston Harbor Islands. Hull EMS contacted watchstanders at Coast Guard Station Point Allerton


New PLA Catamaran Hull Completed

The first of the hulls of the PLA’s new survey vessel is removed from the mould at CTruk’s Essex yard (Photo: CTruk)

The hull structures for the Port of London Authority’s (PLA) new 17-meter survey catamaran have been completed by shipbuilder CTruk.   The two composite hulls were removed from the mold after several weeks of lay-up work and are now undergoing first stage fit out with fuel tank and






 
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