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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

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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'

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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


Drillship Profile: Tungsten Explorer

Ultra Deepwater Drillship designed for drilling operation down to 40,000 ft. (12,120 m) & in water depths to 10,000 ft. (3,048 m)

The Tungsten Explorer is an ultra deepwater, dynamically positioned mobile offshore drilling unit (Drillship). The primary areas of activities of the Drillship shall be in the Gulf of Mexico, West Africa and Brazil. The drillship has drilling equipment on the topside with a continuous main deck


Bosch Rexroth Hydraulics Training Courses Available

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Bosch Rexroth is accepting registration for all courses in its popular training program designed for industrial and mobile hydraulics systems engineers. Rexroth’s Hydraulics Technical Training is targeted toward individuals who maintain hydraulic systems


New Propeller Optimization Process Can Analyze 10,000 Designs a Day

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A newly developed propeller optimizer makes it much faster to identify propeller-hull reactions and reach design decisions. In the EU project STREAMLINE the fuel efficiency of a chemical tanker was improved by optimizing the hull form and propeller


Harmonized CSR-Compliant Ship Design Support Software

ClassNK releases a new version of its PrimeShip-HULL (HCSR) ship design support software that is fully compliant with the new IACS Common Structural Rules

ClassNK released a new version of its PrimeShip-HULL (HCSR) ship design support software that is fully compliant with the new IACS Common Structural Rules (harmonized CSR) for oil tankers and bulk carriers. The new ship design support software is reported to be the first in the world to fully


New Submarine and SWATH Capabilities for HydroComp NavCad

The screen image displays the data entry table and process buttons.

HydroComp NavCad is a software tool for the prediction and analysis of vessel speed and power performance. It also provides for the selection of suitable propulsion system components – engines, gears and propellers. A recent development effort has been undertaken to provide new submarine


Vietnam's First Kilo-class Submarine Arrives Cam Ranh Port

Vietnam PM on earlier visit to submarine Hanoi: Photo credit the shipbuilder

Vietnam’s first Kilo-class submarine named 'Hanoi' has arrived at the Cam Ranh Port in Khanh Hoa Province after a six week voyage from a Russian shipyard aboard the semi-submersible carrier 'Rolldock Sea', reports VietNamNet Bridge. The Kilo-636 submarine


Innovation Spotlight: U.S.-Built Security Vessels

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Building patrol boats is big business, especially for foreign defense needs. U.S. yards compete on a global stage in the all-important maritime security workboat arena.  Patrol boats have continued to enhance bottom lines at many U.S. vessel builders this year through sales that are usually


ClassNK Unveils IACS Compliant Design Software

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ClassNK Releases World’s First Harmonized CSR Compliant Ship Design Support Software.    Classification society ClassNK (Chairman and President: Noboru Ueda) has announced the release of a new version of its PrimeShip-HULL (HCSR) ship design support software that is fully


Nuclear-Powered Container Ship to Serve Russian Arctic

Nuclear container ship Sevmorput: Photo Wiki CCL

Russia has started repairs of the world’s only nuclear-powered container vessel, the 260m long, 61,000 displacement, 'Sevmorput' to be employed in both commercial and military operations in the Russian Arctic, reports Barents Observer.


DSNS Cuts Steel for Indonesian Navy Frigate

SIGMA PKR 10514 Frigate (Image: Damen)

In June 2012, the Ministry of Defense of Indonesia and Damen Schelde Naval Shipbuilding (DSNS) signed the contract for the first SIGMA 10514 Perusak Kawal Rudal (PKR) Frigate. In accordance with the agreed planning for the construction of this frigate


Meridian Salmon Farms Vessel Launched

Sea Chelle

The latest vessel for Meridian Salmon Farms has been launched. Built in Girvan by Alexander Noble & Sons, Sea Chelle is powered by twin L136 Doosan engines supplied by WaterMota, the sixth vessel owned and operated by Meridian Salmon Farms to be fitted with Doosan engines.


Pompe Garbarino Manuals Available in Shipdex

Pompe Garbarino S.p.A., an Italian manufacturer of centrifugal and positive displacement pumps for marine, naval and industrial fields prepare and release the technical manuals according to Shipdex Protocol . Shipdex is the customization for the shipping community of the international S1000D


Omega Debuts New Transmitters

Photo: Omega

Omega introduced new potentiometer input to DC transmitters with the launch of the DMD4008 series of transmitters accepts a resistance input from potentiometer, slidewire, linear position, displacement or rotational devices and provides an optically isolated DC voltage or current output that is


Chinese Customer Signs Up for CRN Megayacht

68-m Megayacht rendering courtesy of CRN

CRN say they have signed  a Letter of Intent (LOI) with a Chinese client for a 68 metres superyacht, the biggest vessel ever sold by CRN and Ferretti Group in China. The historic Italian shipyard of Ancona, part of Ferretti Group, which specialises in the construction and sale of


Glass Apart: Feadship Launch Connoiseur's Superyacht

Megayacht Como launch: Photo courtesy of Feadship

Holland's Feadship say they have launched the 46.22-metre semi-displacement motoryacht 'Como', created for the highly experienced New Zealand yachtsman Neville Crichton. Having previously built a large number of competitive sailing yachts in his native New Zealand and more recently owned a


 
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