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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

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

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

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


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

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

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

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

Jotun: ISO Hull Performance Standard Final Stage

Photo:  Jotun

 The ISO 19030 is finally nearing publication, in a move that has the potential to save the shipping industry as much as USD 30 billion in annual fuel costs.   It’s taken 12,000 hours of development work, involving 53 expert stakeholders, across more than three years

EURONAV Selects Jotun’s HPS for Two Suezmax Vessels


EURONAV has selected Jotun’s Hull Performance Solutions (HPS) for two of its Suezmax vessels. The agreement will see Samsung-built sister ships M/T Cap Guillaume and M/T Cap Philippe receive coatings of Jotun’s advanced SeaQuantum X200 antifouling

Hybrid Technology for Military and Commercial Vessels

WFSV ‘Seacat Intrepid’ built by Alicat – South Boats IOW. Deck layout includes space for ISO containers.

The Hour of Power Comes of Age   The marine industry is now recognizing the potential of utilizing hybrid power and innovative propulsion systems. Certain maritime sectors are potentially well suited to hybrid systems. These include ferries

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