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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


Mouvex Celebrates 110 Years

Mouvex, part of PSG, a Dover company and manufacturer of positive displacement pumps, is celebrating its 110-year anniversary in 2016.    Headquartered in Auxerre, France, Mouvex was founded in 1906 by engineer André Petit when he identified the challenges that gear and lobe


Jotun:ISO 19030 standard can make $30 bln impact on the industry

Geir Axel Oftedahl, Jotuns Business Development Director - HPS Photo Jotun

The International Organization for Standardization (ISO) has now published the long-awaited ISO 19030, a new standard conceived to measure changes in ship-specific hull and propeller performance. According to Jotun, which has led the industry in the standard’s development


AMC’s CTV for a Booming Market

Hurricane Tow Photo Aluminium Marine Consultants

The International Energy Agency states that 2.5% of global electricity demand is today provided by wind power—and that figure is set to grow by 42% through to 2021. In Europe alone, according to the 2016 report from the European Wind Energy Association (EWEA)


COSCO Europe Reduces Fuel Costs, Emissions with Selected HPS from Jotun

Photo: COSCO

In the four years since its coating with Jotun’s Hull Performance Solutions (HPS) system, COSCO Europe has reached new heights of efficiency, cost control and environmental performance. Figures released by Jotun show that the 2008-built, 10,062 TEU container ship has sliced fuel costs by $4


Eastern Delivers Escort Tug to Suderman & Young

(Photo: Eastern Shipbuilding Group)

On July 29, 2016, Eastern Shipbuilding Group, Inc. delivered Oceanus (Hull# 240), the third in series of four identical Robert Allan, LTD. (RAL) designed Z-Tech 2400 Class Terminal & Escort Tugs built for Suderman & Young Towing Company at Eastern’s Nelson Street facility.  


Embracing New Hull & Propeller Performance Criteria

Logos

ISO 19030 – to be published shortly – defines a set of fully transparent methodologies to measure changes in hull and propeller performance. As a leading coatings manufacturer, Hempel pioneered the performance guarantee based on achieving efficiency savings from maintaining a


DNV GL and Hempel to Cooperate for ISO 19030

Pic:  Hempel

 As a leading coatings manufacturer, Hempel pioneered the performance guarantee based on achieving efficiency savings from maintaining a fouling-free and smooth hull.    Therefore, Hempel warmly welcomes the introduction of this internationally recognised and accepted set of


Cummins Delivers First QSK95 Engines

(Image: Cummins)

Manufacturer of diesel engines and generator sets for the marine industry Cummins Inc. said it recently delivered the first four QSK95 engines for a marine application, with four additional units to be delivered in December.   The engines were delivered to longtime Cummins partner SEACOR


Partnership Yields Next-gen Versatile Workboats

Image: AMC

Naval Architect John Kecsmar of Ad Hoc Marine Designs is now working with Aluminium Marine Consultants (AMC) to offer a range of uniquely designed, versatile SWATH workboats.   Kecsmar possesses many decades of experience working and designing in shipyards in all things high-speed and is a


General Dynamics AUV Detects Threats to Ship Hulls

HAUV is a two-man-portable hovering AUV designed for ship hull inspection. Photo GD

General Dynamics Mission Systems featured the Bluefin Robotics hovering-autonomous underwater vehicle (H-AUV) at OCEANS 2016 in Monterey, California. The Bluefin Robotics H-AUV locates, identifies and maps structural issues on a ship’s hull including large ocean going cargo ships


Diana Shipping Delays Newcastlemax Delivery

Courtesy Diana Shipping

Diana Shipping Inc. (NYSE: DSX), (the “Company”), a global shipping company specializing in the ownership of dry bulk vessels, today announced that, through two separate wholly-owned subsidiaries, it signed two addenda with China Shipbuilding Trading Company


Hajioannou Takes on Safe Bulkers Newbuilds

Courtesy Safebulkers

Safe Bulkers, Inc. announced today that the Company has agreed to novate an existing newbuild contract for Hull No. S835, a Japanese Panamax class vessel, and sell, upon delivery, Hull No. 1551, a Japanese Kamsarmax class vessel, in each case, to entities owned by Mr


Horizon Flips First Hull for McAllister

Photo: Horizon Shipbuilding

Horizon Shipbuilding, Inc. of Bayou La Batre, Ala. said it has reached milestone in its contract with McAllister Towing.    The Capt. Brian A. McAllister, the first of up to four hulls, has been flipped and set on the shipbuilding ways


Lloyd's Register Renews Ecospeed Certificate for Ice Ships

“Only a few types of coatings are capable of providing this protection,” says Subsea Industries CEO Boud Van Rompay (Photo: Subsea Industries)

Classification society Lloyd’s Register has renewed its certification of the Ecospeed hard coating as an approved abrasion resistant hull protection system for vessels operating in Polar waters. Upon receiving the new Certificate, Subsea Industries’ CEO Boud Van Rompay said:


HullWiper Delivers 100 Hull Cleans for Maersk Line

Hullwiper in action cleaning the hull of the Maersk ganges. Photo GAC

HullWiper, GAC EnvironHull’s diver-free hull cleaning technology, has completed its 100th clean for Maersk Line. The clean was conducted on the Maersk Ganges in the Jebel Ali Container Terminal, Dubai. The HullWiper Remotely Operated Vehicle (ROV) is an environmentally friendly and






 
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