Marine link
 

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


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


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


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


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


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


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


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


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.  


Gulf Coast Shipyard Delivers MY Imagine

M.Y. Imagine (Photo: GCSG)

Gulf Coast Shipyard Group (GCSG) has delivered the Motor Yacht Imagine.  The M.Y. Imagine, a Trinity built yacht, is a 193’x 32’x 14’6” custom designed semi-displacement aluminum hull and superstructure vessel that was constructed in GCSG’s yard located in New


Submarine Indiana Pressure Hull Complete

Photo by Chris Oxley (HII)

 Huntington Ingalls Industries (HII) announced that its Newport News Shipbuilding division has reached a milestone in the construction of the submarine Indiana (SSN 789). The 16th Virginia-class submarine has reached “pressure hull complete


New Surface Effect Ship from AMC

Image: AMC

New surface effect ships designed and built specifically for the CTV and working vessel high speed market   Specialist aluminum boatbuilder, Aluminium Marine Consultants (AMC), has added a new surface effect ship (SES) design to its portfolio which is designed by Norway’s Espeland and


New Diving Training Ship Delivered to Tunisia

Photo: Franco Ortolani

The Tunisian government has taken delivery of a new training ship, Zarzis A710, which will support diving and security works in air and sea areas of the Mediterranean. The vessel was built by Vittoria Shipyard SpA and commissioned by the Tunisian Defense Ministry as part of the Tunisian-Italian


Blount Boats Delivers Chicago Tour Boat

M/V Skyview (Photo: Blount Boats)

Blount Boats of Warren, R.I. has delivered the M/V Skyview to Shoreline Sightseeing, marking the builder’s second delivery for the Chicago sightseeing company.   With a LOA of 100 feet and maximum beam of 35 feet, the steel Subchapter K passenger vessel designed by Seacraft Design


Bay-Houston's New Escort Tug Launched

Laura B (Photo: Eastern Shipbuilding Group)

Eastern Shipbuilding Group, Inc. has launched Laura B, the final vessel in a series of four Robert Allan, LTD. (RAL) designed Z-Tech 2400 Class terminal and escort tugs built for Bay-Houston Towing Co. The Laura B is scheduled to deliver in 2016.  


Russia: 6th Yasen-Class Nuclear Sub

Photo:  Russian Navy

 Russia's sixth Yasen-class nuclear submarine will be laid down at the Sevmash ship-building company in the city of Severodvinsk on July 29, reports RIA Novosti.   The Navy currently possesses one Yasen-class submarine, the Severodvinsk


AkzoNobel Acheives ISO 19030 Compliance

AkzoNobel’s Marine Coatings business has outlined for the first time its full compliance with ISO 19030, the new standard for measuring hull and propeller performance. The requirements for ISO 19030 have been incorporated into AkzoNobel’s recommendations for hull performance monitoring


Ecospeed Demonstrator Vessel on Display

Shipowners, shipbuilders and representatives from the Green Award Foundation attended the first in a series of planned Ecospeed demonstration ‘roadshows’ (Photo: Subsea Industries)

Shipowners, shipbuilders and representatives from the Green Award Foundation  attended the first in a series of planned ‘roadshows’ Subsea Industries has initiated to demonstrate the zero environmental impact and simplicity of cleaning hulls protected with its Ecospeed hard coating






 
rss feeds | archive | privacy | history | articles | contributors | top news | contact us | about us | copyright