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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'

100_4800_web.jpg

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


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


Third Superyacht under Construction at Sunrise Yachts

Sunrise 45m Atomic:  Sunrise Yachts

 After successful launches of two 45m Sunrise vessels – superyacht Africa (2009) and luxury yacht Atomic (2014) – the Turkish shipyard has recently laid the keel of the third 45m motor yacht at its yard in Antalya, with a scheduled completion time of 26 months.   


Slow Steaming “can damage containers” - BMT

Courtesy BMT

  Fuel saving measures can have a negative effect on the lashing forces on the containers, according to Maritime London member BMT Surveys. The company's risk & quality manager and marine surveyor, Olivier van der Kruijs, bases this warning on audits on more than 100 container vessels


Russia to Construct New Icebreakers

New family of icebreakers

  Flagship of a new family of icebreakers for Russian Navy will be laid at the Admiralteyskiye Verfi shipyards in St Petersburg on April 23. The icebreaker will get the name of The Ilya Muromets after the famous hero of olden Russian legends and will be put on the tables of equipment of


New Domestic Ferry for Faroe Islands Service

Photo courtesy of Knud E. Hansen

Third generation domestic ferry for service between Nólsoy and Tórshavn in the Faroe Islands.   According to the vessel's designer, this project is the second design within the last 15 years for the domestic ferry company Strandfaraskip Landsins and the third generation design


Hull Inspection Systems Delivered to the US Navy

EOD HULS MK19 Systems 4 and 5 vehicles (Photo courtesy of Bluefin Robotics)

Bluefin Robotics has delivered new vehicles to the U.S. Navy that aim to increase the Navy's capability to remotely search and investigate ship hulls, harbor sea floors and other underwater infrastructure for limpet mines, Improvised Explosive Devices (IEDs) and other objects of interest.  


GAC's Hull Cleaning Solution Debuts in Singapore

Photo: GAC

GAC EnvironHull’s eco-friendly, diver-free hull cleaning technology makes its Asian debut at this year’s Sea Asia exhibition, marking its introduction at one of the world’s busiest ports, Singapore.   The HullWiper Remotely Operated Vehicle (ROV) system was launched in


Zentech to Perform ZAIMS Work on Brazilian Aircraft Carrier

Aircraft Carrier São Paulo at sea (Image: Zentech)

Zentech’s President Ramesh Maini announced that the company has been awarded a contract to perform an inspection and evaluation of the hull steel for the Naval Aircraft Carrier São Paulo, as part of the Brazilian Navy’s upgrade of this flagship vessel.  


India to Launch Anti-sub Vessel INS Kavaratti

INS Tarkash. Photo credit: Indian Navy

 India is all set to launch the last of the four anti-submarine warfare (ASW) class stealth corvettes INS Kavaratti, reports Press Trust of India.   Kavaratti, which is 90 percent indigenous, is the last of four ASW class stealth corvettes being built for the Indian Navy under Project


Statoil Awards Hull Cleaning Contract to GAC

Signing of agreement between GAC EnvironHull and Statoil at Statoil’s Headquarter in Stavanger, Norway. From left to right: Åshild Eltervåg, Nadia Nikmanesh, Elin Haave, Karl Ingvar Jorgensen and Robert Anderson. (Photo: Simon Doran)

Eco-friendly HullWiper technology to fight fouling and enhance efficiency for oil and gas company fleet    GAC EnvironHull has signed a contract with the international energy company Statoil to provide underwater hull cleaning services for its vessels operating in Scandinavia


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






 
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