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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 Fast Displacement Yacht is First with Hybrid Propulsion

Photo: Heesen Yachts

A new motoryacht built by built by the Netherlands’ Heesen Yachts is the world’s first Fast Displacement equipped with hybrid propulsion. Christened M/Y Home, the vessel is ultra-efficient, low fuel-burning and one of the quietest on the oceans.   There are two sources of power for propulsion: diesel mechanical and diesel electrical. Either source can be used independently or simultaneously, providing less noise and vibration


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


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


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


DHS Custom Passenger Ferry Launched

Photo: Gulfstream Shipbuilding

Gulfstream Shipbuilding launched a custom passenger/vehicle ferry for the U.S. Department of Homeland Security (DHS) on July 12, 2017.  This 118 x 27 x 10.75 ft. crew boat-style vessel will be delivered in the fall 2017 to service the New York and Connecticut waters


CSSC to Build Research Vessels

Photo:  China State Shipbuilding Corp

 China's government controlled China State Shipbuilding Corp (CSSC) is going beyond building navy vessels and making advanced scientific research ships, Xinhua reported.   CSSC has been focussing on defence sector till now. It was the largest supplier of surface combatants to the


Grand Bahama Shipyard Appoints UK Representative

Carnival Glory (Photo: GBS)

Grand Bahama Shipyard and L&R Midland (UK) Ltd have signed an exclusive agency agreement covering the U.K. markets effective June 1, 2017.   Caribbean shipyard Grand Bahama Shipyard (GBS) has engaged L&R Midland (UK) as its representative in the U.K


ClassNK Updates PrimeShip-HULL for Container Carriers

Photo: ClassNK

Classification society ClassNK has released its latest version of its structural design support software for container carriers “PrimeShip-HULL for Container Carriers.” “PrimeShip-HULL for Container Carriers” consists of prescriptive calculation software and direct


Norwegian Joy Christened in Shanghai

Photo: Norwegian Cruise Line

Norwegian Cruise Line’s first custom-designed ship for the Chinese cruise market, Norwegian Joy, was christened in a ceremony held onboard the vessel in Shanghai that featured a performance by the ship’s Godfather, singer songwriter, music producer, actor and film director, Wang Leehom


SCHOTTEL Debuts Underwater Mountable Thruster

(Photo: SCHOTTEL)

SCHOTTEL has expanded its portfolio with the successful tests of the 5.5 MW SRP 800 U rudderpropeller, which can be installed afloat for vessels that cannot be docked easily due to their size or area of operation. Besides application in larger offshore vessels or rigs


Marine News Boat of the Month: June 2017

Image: Elastec

Elastec’s Inlander RUB: a versatile spill response workboat   The Elastec Inlander river utility boat (RUB) is a unique concept. But, Elastec already manufactures many other response and utility craft for this market. What prompted the internal effort to create such a craft was that


ClassNK Unveils Longitudinal Strength Assessments Software

PrimeShip-HULL(Rules)/PartC15 (Image: ClassNK)

Classification society ClassNK released a new longitudinal strength assessments software “PrimeShip-HULL(Rules)/PartC15” as part of its prescriptive calculation suite “PrimeShip-HULL(Rules)”.   For ensuring further safety and streamlining structural design of ships


Tech File: HydroComp NavCad for Optimized Design

Schematic and implemented bulb geometry

HydroComp NavCad, internationally recognized for resistance and propulsion prediction for naval architects, can also leverage analysis capabilities with features that support optimized hull form and propulsion system design.   NavCad may be most well-known for its library of


Submersible, Magnetic Robot Performs Hull Inspections

Photo: Deep Trekker

Canadian company Deep Trekker has launched a new inspection vehicle at Nor-Shipping 2017: the Deep Trekker DT640 Utility Crawler, the first three-wheeled vehicle of its kind.   Equipped with an HD camera, magnetic wheels and a multitude of application specific add-ons


DNV GL Releases New Guidelines for Submarine Pipelines

Photo: DNV GL

 Depending on the interaction between the pipe and soil, submarine pipelines, both exposed and buried, may be subject to severe displacements and impaired pipeline integrity.    Soil characterization and pipe-soil interaction assessment are therefore important parts of any


MTEA Launches New EPA Tier 3 Marine Engine

Photo: Mitsubishi Turbocharger and Engine America, Inc.

Mitsubishi Turbocharger and Engine America, Inc. (MTEA) announces the introduction of a 684 hp at 1,800 rpm (510 kW at 1,800 rpm) engine that complies with EPA Tier 3 regulations. The new S6R-Y3MPTAW-1 model is a propulsion-certified unit ideal for heavy-duty workboat repower applications


MAN Rollo Supplies Engines for Hybrid Patrol Boat

Photo courtesy of MAN Rollo

In April this year, MAN Rollo supplied two engines for the RPA8 hybrid patrol boat, which Kooiman Shipyard was commissioned to build by the Port of Rotterdam Authority. When putting out a tender for the patrol boat, the Port of Rotterdam Authority defined a number of principles


Biofouling Keep Out!

© Svetlana Yudina / Adobe Stock

Biofouling was a backburner issue until 5 March 2017. On that day the Government of New Zealand ordered the bulk carrier DL MARIGOLD out of NZ waters after the vessel’s hull was determined to be excessively fouled with potentially invasive organisms including barnacles and tube worms. 


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






 
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