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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.


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


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


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


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


China's Scrap Yards Apply for EU Regulation

China's Zhoushan Changhong International Ship Recycling and Jiang Xiagang Changjiang Ship Recycling Yard, world’s two biggest ship scrap yards by capacity,  have applied for the inclusion of their facilities in the future EU list of Ship Recycling Facilities.  


Cecon Secures Finances to Complete Newbuild

Cecon ASA has petitioned for a debt restructuring agreement (in Norwegian: gjeldsforhandling). Certain funds managed by York Capital Management Global Advisors, LLC, the principal bondholder under the group's senior bond loan agreement, has confirmed its continued support for the Cecon


LR Supports Chinese Recycling Yards' EU Application

Mr Li Hongwei (left) with LR’s Jim Heath

LR’s initial verification of the Ship Recycling Facility Plans for both Zhoushan Changhong International Ship Recycling Co. Ltd. and Jiangyin Xiagang Changjiang Ship Recycling Yard – the first non-EU applications – is a vital first step towards the facilities’ inclusion on


FPSO Trio Receives Side Shell Protection

Steel top plates welded to ship to form cavity into which elastomer core will be injected

SPS Overlay has yet again been used for side impact protection on three FPSOs for a major player in the offshore industry. The work was carried out at Enseada do Paraguaçu S.A. Shipyards (EEP) in Brazil and COSCO (Dalian) Shipyard, China


Gamma Builds Customized Yacht for Andrea Bocelli

Photo: Vripack

Gamma Yachts has built its most customized Gamma 20 so far, with smart design from Vripack, to opera singer Andrea Bocelli.   Gamma Yachts announced the delivery of 22.1-meter M/Y Libertas, the third in its Gamma 20 ‘mini’ super yacht series


Fincantieri Launches Italian Navy Frigate

FREMM Frigate Alpino is the fifth of a series of 10 for the Italian Navy

Riva Trigoso (Genoa) shipyard celebrated the launch of the frigate Alpino, the fifth of a series of 10 FREMM vessels - Multi Mission European Frigates, ordered from Fincantieri by the Italian Navy within the framework of an Italo-French program of cooperation.   


Petrobras P-66 hull Ready For Integration

P-66 First of eight cloned FPSO hull gets out of dry dock

  On Monday, December 8, Petrobras began transporting the hull of P-66, the first platform in a series of eight “replicant” FPSOs (floating production, storage and offloading units) being constructed to meet oil production demands in Brazil


ClassNK & NAPA tie-up to Improve Ship Design

Logos

ClassNK and leading global maritime software company NAPA have announced a new joint project to reduce the time and cost of designing vessels in accordance with the new IACS harmonised Common Structural Rules. The new project will enhance the data linkage between ClassNK’s


New Auxiliary Power Unit from John Deere

john deere logo.jpg

John Deere Power Systems (JDPS) will exhibit an auxiliary power unit equipped with a PowerTech Plus 9.0L industrial diesel engine that meets U.S. EPA Marine Tier 3 emissions regulations at the International WorkBoat Show in New Orleans. The PowerTech 6090HF485 is a radiator-cooled


Caterpillar Completes 1st Dual Fuel Engine Retrofit

Dual fuel marine engine, the MaK M 46 DF

Caterpillar Marine successfully completed the commercial marine industry’s first dual fuel engine retrofit conversion in hull. Performed in under six weeks, Caterpillar Marine along with Cat dealer Bolier, completed an in hull retrofit onboard the Coral Anthelia


Seacor Takes Delivery of 10,800 HP Crewboat

Photo courtesy of Seacor Marine

Seacor Marine is building ever larger and more powerful mono-hull crew/supply boats. The first of these to be delivered is the 202x34-foot Alex F. McCall with some very impressive statistics.   With a length between perpendiculars of 186 feet and a 13-foot molded depth the new vessel has a


USCG Warns on Hull Magnet Modifications

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This alert raises awareness as to the importance of not modifying equipment or components from their intended design or operation.  Recently, a State Pilot suffered a concussion as he was boarding a vessel via its pilot ladder.  The primary cause of the accident was an improperly


Teekay Renews Hull and Propeller Monitoring for LNG Carriers

Daniel Kane

Canada-based shipping company Teekay Corporation has renewed its contract with Propulsion Dynamics for its hull and propeller performance monitoring system CASPER Service. The Computerized Analysis of Ship PERformance (CASPER Service) from Propulsion Dynamics is a turnkey subscription service


Performance by Design: Hydrodynamics for High-Speed Vessels

Performance by Design: Hydrodynamics for High-Speed Vessels

The new book “Performance by Design: Hydrodynamics for High-Speed Vessels” will be introduced on October 30 at the Fort Lauderdale International Boat Show, Donald L. Blount, founder of Donald L. Blount and Associates, announced. A limited number of books will be available at Booth 685


Ocean Ships, APT, Awarded DoD Contract Modifications

USNS Montford Point: Photo MSC

The US Department of Defense inform that Ocean Ships, Inc., and American Petroleum Tankers, have been awarded Military Sealift Command contract modifications for charter, operation and maintenance of vessels as follows: 1. Ocean Ships, Inc






 
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