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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


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


Sea Machine: Unmanned Autonomous Workboat

Photo courtesy of Sea Machine

Press release- The Sea Machines V2 is a heavy-duty autonomus workboat built for offshore and nearshore operations.   The semi-displacement hull provides open-ocean stability for surveying or USBL communications and the powerful propulsion system delivers more than 20 knots and 3 tons bollard pull when needed.   With a pilot house and helm, the V2 is designed for operators who desire an autonomous vessel that can also be manually-driven as a conventional boat


UK-built Mussel Boat for Offshore Shellfish

Alysée (Photo: Alnmaritec)

U.K. based boat builder Alnmaritec announced it has designed and built a new 15.2-meter aluminum Wave Farmer 1400 mussel farming boat, Alysée, for U.K. shellfish farmer Offshore Shellfish.   Developed from Alnmaritec’s Wave Train catamaran hull form


ClassNK: New Software System for Container Carriers

(PRESS RELEASE) ClassNK released its new structural design support system PrimeShip-HULL for Container Carriers to correspond with its latest rule amendments. To promote container carrier safety, ClassNK released amendments to its Rules and Guidance for the Survey and Construction of Steel


Inland Vessel Profile: USACE’s Dan Reeves

M/V Dan Reeves (Photo by Richard Dollison)

The newly built M/V Dan Reeves was commissioned in January of 2016 for the United States Army Corps of Engineers (USACE) Little Rock District. Built by Horizon Shipbuilding, Inc., Bayou La Batre, Ala., overseen by the USACE Marine Design


The Next Generation of Hull Performance Management

Hull performance monitoring solutions can offer significant fuel savings potential, a fact that is prompting growing interest from the maritime industry. To spur development and increase awareness of this exciting field, DNV GL and paint manufacturer Jotun have created the Hull Performance &


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


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


DNV GL, Hempel to Cooperate for Fleet Performance Improvement

(left to right): Claes Skat Roerdam, Fouling Control Marketing Manager at Hempel, Christian Ottosen, Group Vice President Marine Marketing at Hempel, Tor E. Svensen, DNV GL Group Executive Vice President, and Vincent Li, General Manager Maritime Advisory Greater China at DNV GL  (Photo: DNV GL)

Press release - To reap the benefits of any efficiency improvements, reliable measurement and analytics are essential, both to set baselines and to calculate returns. Today, at Marintec China trade fair, Hempel and DNV GL signed a cooperation agreement to work together to bring customers clear


Blount Boats to Build Chicago Tour Boat

Image: Blount Boats

Blount Boats, Inc. has been contracted to build a 100- x 35-foot steel passenger ferry boat for Shoreline Sightseeing Co., Chicago, Ill.   The proposed 300-plus passenger, Sub-Chapter K vessel was designed by Seacraft Design, LLC, Sturgeon Bay, Wisc


Chesapeake Adds Fabrication Building

Photo: Chesapeake Shipbuilding Corp.

Chesapeake Shipbuilding Corp. announced that its fifth hull fabrication building is complete in Salisbury, Md.   The new building is 160 feet long by 70 feet wide and 70 feet high, and will allow larger hull sections to be construction in an indoor environment at the yard






 
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