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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).


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.


AAM to Construct USACE Survey Catamaran

Photo: USACE

All American Marine, Inc. (AAM) was recently awarded a contract by the U.S. Army Corps of Engineers (USACE) for the design and construction of a new hydrofoil supported aluminum catamaran survey vessel.    The vessel will primarily perform survey missions and some dive operations in support of dredging work planned within the Corps’ Philadelphia District.  USACE has designated that the new catamaran will replace the aging survey boat, Shuman


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


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


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


Jotun’s HPS Delivers Fuel, Emission Savings

Penguin Arrow (Photo: Jotun)

Jotun has analyzed the first ever five year dry-docking of a vessel treated with its Hull Performance Solutions (HPS) system. The data revealed that Gearbulk’s Penguin Arrow, coated with Jotun’s SeaQuantum X200 in September 2010, recorded a staggering estimated fuel saving and CO2


New System Reduces Risks in Ice Operations

An intelligent ice load monitoring system for the ships operating in ice covered waters will provide the operators a tool to handle the ships in safe but efficient ways.    The state of the art system will monitor the hull loads with optical sensors installed on the steel structures of


ABS's AIP for HHI FLNG Hull

Andre Han, Vice President, Business Development in the ABS Pacific, Korea and Northern Region (left), presents Yun-Sik Lee, Executive Vice President, Shipbuilding Division at HHI, with a certificate acknowledging Approval i

ABS has granted approval in principle (AIP) to a Hyundai Heavy Industries (HHI) floating liquefied natural gas (FLNG) hull design. Specifically conceptualized for near-shore operations, the vessel was designed with a length of 1,050 ft (320 m), a breadth of 197 ft (60 m)


Torqeedo to Showcase Cruise Engine at Seawork

Photo courtesy of Torqeedo

Torqeedo will debut its innovative new electric motor at this year’s Seawork International.   The new generation, the Cruise 10.0R, is equivalent to a 20HP combustion engine. It boasts 12kW peak power, 10kW continuous power and a voltage level of 48V to deliver impressive


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 &


Rolls-Royce Mooring System for Giant Crane Vessel

Photo: Rolls-Royce

Rolls-Royce has signed a $11.5 million contract to supply the mooring system for the world’s largest semi-submersible crane vessel (SSCV), Sleipnir. The vessel will be built in Singapore by SembCorp Marine for the Dutch company Heerema Offshore Services.  


USACE Orders Foil-assisted Survey Catamaran

Image: AAM

All American Marine to construct hydrofoil-assisted survey catamaran for USACE Philadelphia District   The U.S. Army Corps of Engineers (USACE) has awarded a contract to All American Marine, Inc. (AAM) for the design and construction of a new hydrofoil supported aluminum catamaran survey


Willard Marine’s Twin Diesel RIB

Photo: Willard Marine

Rigid hulled inflatable boats (RIBs) have come a long way since their initial development in the United Kingdom in the late 1960s. Long noted for their stability and safety in turbulent seas, they have found applications in rescue work and military settings.  


MHI Delivers "Jinryu" Japan's 7th Soryu-Class Submarine

The ceremony was attended by MOD officials including State Minister of Defense Kenji Wakamiya, JMSDF Chief of Staff Tomohisa Takei, and Acquisition, Technology and Logistics Agency Commissioner Hideaki Watanabe Photo MHI

Mitsubishi Heavy Industries, Ltd. (MHI) delivered the "Jinryu" submarine to the Japanese Ministry of Defense (MOD) today in a ceremony held at the MHI Kobe Shipyard & Machinery Works' No.3 pier in Kobe, Hyogo Prefecture. The Jinryu is the seventh Soryu-class submarine supplied to the


Sea Level Rise Projected to Displace 13 million in U.S. by 2100

The number of people who could be displaced in U.S. coastal regions due to rising sea levels this century as a result of climate change is much higher than previously thought, with more than 13 million Americans at risk with a 6-foot (1.8 meters) rise including 6 million in Florida


Tideman Boats Debuts High Speed Crew Tender

Tideman Boats RBB 800 Photo Tideman Boats

After a period of three years building sustainable and fast moving workboats out of HDPE (High Density Poly Ethylene), the Dutch boat builder Tideman Boats, presents a new high-speed professional crew tender. “As manufacturer of indestructible high-speed HDPE workboats


Pioneering Container Feeder Vessel Designs

ECX-3800 3800 TEU Feeder Vessel (Image: KNUD E. HANSEN)

The Danish naval architect company KNUD E. HANSEN has recently been developing a number of container feeder vessel designs. Each of the designs presents a series of innovations as part of a solution tailored to specific requirements.  


Saving with Jotun’s Hull Performance Solutions Guaranteed

SeaQuantum X200’s silyl methacrylate coating technology delivers clean hulls, saving money for owners Photo Jotsun

Jotun has analysed the first ever five year dry-docking of a vessel treated with its Hull Performance Solutions (HPS) system. The data revealed that Gearbulk’s Penguin Arrow, coated with Jotun’s SeaQuantum X200 in September 2010, recorded a staggering estimated fuel saving and CO2






 
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