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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'


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

New Operational Structure for Van Oossanen

Netherlands-based Van Oossanen Naval Architects is continuing to trade under the name Van Oossanen. Van Oossanen will act as the Van Oossanen Group, incorporating Fluid Dynamics, Naval Architecture and Hull Vane BV, an independent company established by Van Oossanen.  

'Brodosplit' Delivery for Fincantieri Group

Courtesy Brodosplit  Shipyard

  By loading fitted sections (grand blocks), with more than 1450 tons of steel equipped with piping, ironmongery components and electric routing on a special cargo barge delivery was executed in Shipbuilding Industry Split Inc. on 5 November 2015.

Historic Vessel Laser Scanned for Hull Refit

Image: API Services

New York’s Lake George Steamboat Company recently commissioned API Services to laser scan the hull the oldest boat in its fleet, the 107-year-old Mohican.   The original Mohican, in service from 1894 to 1907, was a 93-foot wooden hull vessel

SCANIA Expands its Engine Range for Marine Applications

Two of the power packs are installed on SAR boat “Björn Christer.”

Scania, a tradition-rich Swedish industrial company will celebrate in 2016 its 125-year in existence. Very early on in 1902, the first engines for marine applications were produced. In fact, the market was considered so promising that the company’s new factory, which was built in 1907

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

NBBB Uses New System to Launch Tug for Kirby

(Photo: Nichols Brothers Boat Builders)

A newly built articulated tug barge (ATB) unit tugboat, was launched for Kirby Offshore Marine on Wednesday, September 2.   The new vessel, the 136’ x 44’ x 19’ Nancy Peterkin, is the first of two sister vessels built for Kirby by Ice Floe

Risk Profile of Hull Market Improving - IUMI

IUMI’s Ocean Hull Committee Chairman, Mark Edmondson

  IUMI – the International Union of Marine Insurance – at its annual conference in Berlin yesterday announced that global hull premiums for 2014 totalled USD 7.6bn, a 5.8% reduction from 2013. IUMI’s Ocean Hull Committee Chairman, Mark Edmondson, commented

Transas T-Bridge Installed on Ice Class Vessels

Photo courtesy of Transas Marine

Transas Marine informs it has installed and commissioned the Transas T-Bridge integrated bridge systems aboard three ice class vessels built by Keppel Singmarine, the specialized shipbuilding subsidiary of Keppel Offshore & Marine. Transas supplied Integrated Bridge Systems including full

Flexibility Key to MES’ New FPSO Hull Platform

Japanese shipbuilder Mitsui Engineering & Shipbuilding Co., Ltd. (MES) announced it has developed a next generation hull platform for floating production, storage and offloading system (FPSO) that aims to offer improved flexibility between projects.  

MAN 32/44CR Engine US EPA Certified

Image: MAN Diesel & Turbo library photo of the MAN 32/44CR engine

MAN Diesel & Turbo announced that its MAN 32/44 Common Rail engine family (rated power: 3,600 – 12,000 kW) has received U.S. EPA Certification, a requirement for all engines installed aboard U.S.-flagged vessels. Chuck Griffith, Sales Manager, MAN Diesel & Turbo, North America

MHI's Two New Firms Commence Operations

MHI Shipyard, Nagasaki Credit Wiklpedia CCL

  On October 1 two new wholly owned group companies of Mitsubishi Heavy Industries, Ltd. (MHI) succeeding to MHI's ship construction operations in the Nagasaki district will commence business operations. Mitsubishi Heavy Industries Shipbuilding Co., Ltd

USS Fort Worth Completes CARAT Exercise with Bangladesh Navy

Ships from the Bangladesh and U.S. navies gather in formation during Cooperation Afloat Readiness and Training (CARAT) Bangladesh 2015.

  The littoral combat ship USS Fort Worth (LCS 3) completed its first Cooperation Afloat Readiness And Training (CARAT) exercise with Bangladesh in the Bay of Bengal, Oct. 3. CARAT Bangladesh 2015 is a tangible representation of the continued U.S

Mercury Marine, FPT Partner for Diesel Engine Launch

Mercury Marine informs it has signed a supply agreement with FPT Industrial to make the FPT 6.7L mechanically fuel injected NEF engines available for sale in global markets.   Martin Bass, Mercury Marine vice president of global category management, said

Complex Hull Shapes Need Sophisticated Assessment

Van Oord asked MARIN to perform a full assessment of the hull lines of its new hopper dredger.    Twin gondola aft bodies have been successfully applied to hopper dredgers for many years. This is usually combined with a tunnel head box combination above the propeller

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