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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.


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


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


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


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


Hull Cleaning Robot Deployed in Rotterdam

Photo courtesy of René Klootsema

Recently the hull of the vessel Vlieborg from Wagenborg has been cleaned in the Port of Rotterdam by Fleet Cleaner and OH Ship Cleaning. The vessel was heavily fouled with slime and algae, which were all removed from the hull and captured by the installation


Is Tin Returning in Silicone Hull Coatings?

Photo: Subsea Industries

The reemergence of organotin in marine hull coatings is of increasing concern, with academics and environmentalists calling on International Maritime Organization (IMO) to investigate the use of tin in silicone-based foul release systems and other ships hull coatings.  


Mitsui Innovation: noah-FPSO Hull Gets AIP from BV

(Image: Mitsui)

Mitsui Engineering & Shipbuilding Co., Ltd. (MES) obtained Bureau Veritas Approval in Principle (AIP) for the noah-FPSO Hull and associated design and construction methods following American Bureau of Shipping. This AIP provides assurance of the feasibility and reliability of the


DNV GL Grants AIP for Double Side-hull LPG Carrier

Photo: DNV GL

At the Gastech 2017 conference in Tokyo, DNV GL presented Hyundai Mipo Dockyard (HMD) with an approval in principle (AIP) certificate for a new double side-hull LPG carrier design – LPG SAFE (Structural Advances for the Environment). The result of a development project conducted by HMD


Dirty Ship Ordered to Leave New Zealand

Photo: Port of Tauranga

 Indonesian bulk carrier  DL Marigold has been ordered to leave port of Tauranga  in New Zealand waters after its hull was judged to be threat to bio-security.   The Ministry of Primary Industries (MPI) has sent the ship packing from Tauranga because of its dirty hull - the


Foss’ New Arctic Class Tug Is Nearly Complete

Photo: Foss Maritime

Foss Maritime said its third of three new Arctic Class tugs being built at the Rainier, Ore. shipyard is nearing completion and expected to enter service later this year.     The tug Nicole Foss is ice class D0, meaning the hulls are designed specifically for polar waters and are


Cammell Laird Awards Coatings Contract for RRS Sir David Attenborough

Artists impression of the RRS Sir David Attenborough unloading supplies in Antarctica. Copyright Rolls Royce.

Subsea Industries’ Ecospeed hull protection system has been selected for RRS Sir David Attenborough, the polar research ship under construction at the Cammell Laird shipyard in Birkenhead, Liverpool, U.K.   The £150 million contract to build the vessel


Fleet Cleaner Completes Its First Job

Photo: Fleet Cleaner

Dutch company Fleet Cleaner said it has completed its first hull cleaning trial in December 2016 in the Dutch port of Den Helder, using a robot to clean the hull of HNLMS Karel Doorman, the largest vessel of the Royal Netherlands Navy.  


RoPax hull launched at Niron Staal - Damen

Damen Ropax 5212 Courtesy Damen

Marking the completion of the first new build contract between Niron Staal Amsterdam and Damen Shipyards Group, the hull of a RoPax 5212 passenger ferry hull has been launched from Niron Staal’s facilities in Amsterdam. Preparations for the launch started early on Tuesday morning when the


Marine News Boat of the Month: January 2017

Image: Gulfstream Shipbuilding

Gulfstream Shipbuilding’s Custom Aluminum Ferry: U.S. Department of Homeland Security awards Ferry Contract for vessel built specifically for Eastern Coastal Waters.   In December, Gulfstream Shipbuilding was awarded a contract through the United States Department of Homeland Security


Hull Biofouling Environmentally More Damaging than Ballasting

Unlike biocidal coatings, the in-water cleaning of hard inert coatings is permitted in most of the world’s ports and harbours Photo Subsea Industries

The entry into force of the Ballast Water Convention this September will not prevent the transfer of invasive aquatic species (IAS) unless there is mandatory legislation in place to prevent biofouling on ships’ hulls. Commenting on a presentation delivered at the World Ocean


Invasive Species & Ship Hull Biofouling

Unlike biocidal coatings, the in-water cleaning of hard inert coatings is permitted in most of the world’s ports and harbors (Photo Subsea Industries)

The entry into force of the Ballast Water Convention this September will not prevent the transfer of invasive aquatic species (IAS) unless there is mandatory legislation in place to prevent biofouling on ships’ hulls. Commenting on a presentation delivered at the World Ocean


HullPIC conference Showcases Solutions

Photo: DNV GL

 To spur development and raise awareness for hull performance monitoring, DNV GL and paint manufacturer Jotun are inviting industry stakeholders to the second Hull Performance & Insight Conference (HullPIC).    Hull performance monitoring solutions offer significant fuel


Meet Seahunter, a Multipurpose Connectable Plastic Workboat

(Photo: Lamor Corporation)

A new multipurpose connectable plastic workboat offers versatility to a variety of end users. Seahunter can serve as a multi-use commercial platform or powered vessel, with each hull designed to used individually or connected together at port, starboard or bow with lockable pins.  


Grand Bahama Shipyard Stayed Busy in 2016

V Ships USA LLC Boston - CSL Acadian (Photo: Grand Bahama Shipyard)

Grand Bahama Shipyard said it enjoyed a busy 2016, performing repairs, refurbishments and retrofits on vessels from all segments of the commercial maritime industry   The Caribbean shipyard Grand Bahama Shipyard Limited (GBSL) worked on 49 commercial vessels and 20 cruise ships throughout






 
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