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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


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.


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).


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


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


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


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


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


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


GE Gas Turbines to Power Turkish Corvettes

Photo: GE Marine

GE Marine announced it has signed a contract with Savunma Teknolojileri Mühendislik Ve Ticaret A.Ş. (STM), Ankara, Turkey, whereby GE will provide STM with LM2500 gas turbines. The engines will power the Turkish Navy’s third and fourth MILGEM multi-purpose corvettes


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.  


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


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.  


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


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


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


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.   


DNV GL Launches Hull, Propeller Analytics

DNV GL is will launch a hull and propeller performance analytics module as part of the new fleet performance management service ECO Insight. The module is based on computational fluid dynamics (CFD) methods to correct for changing operational conditions and produces much more accurate results than


MES Delivers FPSO Hull to MODEC

Photo: MES

Mitsui Engineering & Shipbuilding Co., Ltd. (MES) delivered the hull of a floating production, storage and offloading unit (FPSO) for MODEC, Inc.   The FPSO hull sailed out from MES’ Chiba Shipyard on February 27, 2015.  


JNPT Plans Parallel Port

Image: Jawaharlal Nehru Port Trust

 State-run Jawaharlal Nehru Port Trust (JNPT), India’s busiest container gateway near Mumbai, is planning to build a satellite port in one of the three locations that had already been identified--Vijaydurg, Revas-Karanja and Dahanu.  


Hull Form Optimization Yields Fuel Savings

Wave behind transom is small for the developed hull form without any diverging waves (Image courtesy of Foreship)

Hull form optimization and hydrodynamic design contribute to fuel consumption savings to be achieved by a new generation coastal general cargo ship.   Finnish owner Meriaura Group signed for two 4,700DWT Ice Class 1A VG EcoCoasterTM general cargo newbuilds at Dutch yard Royal Bodewes in


Custom Ro-Pax Delivered in China

San sha No. 1 (Photo courtesy of Knude E. Hansen A/S)

The first Ro-Pax cruiser designed and built in China for the Chinese market has entered into service on January 1, 2015.   The ship, named San sha No. 1, can carry wheeled cargo, containers, trailers as well as passengers, and was delivered to China's southernmost city Sansha in Hainan


USCG’s New Cutter Powered by GE

Hamilton enroute to commissioning (photo courtesy of HII)

GE LM2500 gas turbine-powered National Security Cutter Hamilton commissioned by United States Coast Guard    National Security Cutter Hamilton (WMSL 753) was commissioned by the United States Coast Guard (USCG) on December 6, 2014, at its home port of Charleston, S.C


Common-rail Injection for Sub-110hp Marine Diesels

Image: Yanmar

The new JH-CR series engines from Yanmar bring the benefits of common-rail fuel injection technology to units of below 110mhp.   Boat owners can now choose digitally-controlled common-rail engines from the Yanmar range with power outputs starting as low as 45mhp






 
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