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Propellers

New Propeller Optimization Process Can Analyze 10,000 Designs a Day

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A newly developed propeller optimizer makes it much faster to identify propeller-hull reactions and reach design decisions. In the EU project STREAMLINE the fuel efficiency of a chemical tanker was improved by optimizing the hull form and propeller. To this end, MARIN used its hull optimization program PARNASSOS EXPLORER and a newly developed propeller optimizer. The hull form itself was optimized for low resistance and for having a wake field as rotationally symmetric as possible, while simultaneously maintaining the displacement and sufficient space for the engine room. Meanwhile, the propeller was required to deliver the right thrust at the same ship speed and engine rate of revolutions. Normally, the propeller designer starts when the hull lines have been set and the main propeller parameters have been decided upon. These parameters follow from series analysis, such as the Wageningen B-Series, plus hands-on experience and rules of thumb to estimate the effect of propeller-hull interaction. For instance, the sector knows that the best propeller diameter in a wake field is smaller than given by the propeller series. Once the main dimensions are selected, the designer continues to mold the geometry until the efficiency is high and the hindrance from cavitation is as low as possible. This is a time-consuming process that is particularly ill-suited to finding the best propeller when considering 500 hull form variations can be generated, as was the case here


CP Propeller Drive Celebrates 100 Years

MAN B&W Diesel has been part of the propeller business from the very beginning. The first Alpha Controllable Pitch Propeller was produced in 1902 and patented in 1903. In the meantime, more than 6500 MAN B&W propellers have gone into service. A great variety of CP Propellers with Propulsion Control Systems for all applications up to to-day’s 30 000 kW range. On 3 December 1903 the CP Propeller patent came into force


Mercury Marine Acquires Teignbridge Propellers

Mercury Marine announced today that it has acquired Teignbridge Propellers Ltd., headquartered in Newton Abbot, United Kingdom. Teignbridge Propellers produces bronze and Nibral (nickel, bronze, aluminum) propellers for yachts, patrol boats and commercial vessels. In addition to its line of standard and custom propellers, Teignbridge also produces a complete underwater package of stern gear for inboard-powered vessels, which includes rudders, shafts, struts, seals, logs and bearings.


India Tankship to Retrofit MAN Kappel Propeller

MT Jag Lavanya: Photo credit MAN Diesel & Turbo

MAN Diesel & Turbo’s PrimeServ retrofit team is to supply India's Great Eastern Shipping Company (GESCO) of Mumbai with an upgrade retrofit propeller for their tankship 'Jag Lavanya', a Samsung 2004- built 105,000 dwt crude oil carrier.
 Kappel fixed pitch propellers
 MAN Diesel & Turbo recently announced a strategic focus that added the Kappel design to its fixed-pitch propeller portfolio, both for newbuildings and as a retrofit solution to vessels already in service


New Fixed Pitch Propeller Design from Wärtsilä

Wärtsilä introduced the FPP Opti Design, a new fixed pitch propeller (FPP) design concept. According to Wärtsilä, the new design offers fuel savings of up to 4 percent and highly reliable full scale performance predictions. The concept has been developed utilizing the latest computational fluid dynamics (CFD) technology. The Wärtsilä FPP Opti Design has been developed at the company’s Technology and Service Centre in the Netherlands


A Heavyweight on Display at SMM

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On Thursday morning a huge mobile crane placed the five-blade ship propeller in front of the main entrance of Hamburg's fair center, Hamburg Messe. The propeller is a head-turner at this year's SMM, the leading international trade fair of the maritime industry. Weighing in at around 80 metric tons, with a diameter greater than nine meters and a total blade surface area of 42 square meters, the ship propeller made by Mecklenburger Metallguss GmbH (MMG) is an impressive head-turner at this


Tests Prove CLT Prop Characteristics

The CLT propeller recently underwent real-world testing, which proved, according to its designer and manufacturer that the propeller can help to reduce or eliminate hull-induced vibrations and noise levels. Independent studies were conducted aboard Superfast Levante, which demonstrated that: the cavitation level developed on the CLT propeller blades is negligible from the ship's structural integrity point of view; vibration and noise levels are excellent in terms of comfort on board; and the


New Solution for Measuring Hull Paint Performance

MACSEA offers an independent hull monitoring service designed to save fuel and reduce emissions by detecting hull fouling as early as possible. The new service, called Hull Medic, uses automatic onboard data acquisition to gather salient ship performance data and transmit it ashore for detailed analysis. Hull Medic will typically review 100,000’s of a ship’s data records per month, providing high-accuracy statistical analysis for earlier detection of hull fouling


W&O’s Emerson Elected Propeller Club VP

Tammy Emerson

W&O, a global supplier to the marine and upstream oil and gas markets for pipe, valves and fittings, valve automation, and engineered solutions, announced that Senior Account Executive Tammy Emerson has been elected as vice president of programs of the Jacksonville Propeller Club. Emerson’s marks the first time in Jacksonville Propeller Club history that there is an all-female Executive Board. “Tammy has been an outstanding ambassador at W&O for many years


MAN Propulsion Packages for New Icelandic Trawlers

New Icelandic trawler rendering courtesy of MAN

MAN Diesel and Turbo inform that Icelandic owners, HB Grandi, Vinnslustodin hf. and Hradfrystihusid Gunnvör, have ordered newbuildings based on two different ship designs from specialist fishing-vessel consultants and designers, Nautic and Skipasýn. Optimised for safety, operational economy and pulling power, the 50-metre-plus vessel series differ in their choice of specified propeller, aft-ship and propeller-nozzle configurations


Volvo Penta Unveils Forward Drive Innovation

New Marine Propulstion Technology_Volvo Penta Forward Drive (Rear 3Q)_FINAL

A revolutionary new concept in marine propulsion, the first Volvo Penta Forward Drive (FWD), debuted today at an exclusive event at the Miami International Boat Show.   Opening up a new realm for recreational water sports, the Volvo Penta FWD begins with forward-facing dual counter-rotating


Eastern Debuts ‘Thunderbolt’ Towboat

THUNDERBOLT combines Twin Electric V-Pod Propulsion and Diesel-Electric Technology offering it to the US Inland Waterway’s Market

Eastern Shipbuilding Group, Inc. introduced its new 120-foot, 4,200-horsepower Inland Towboat design, THUNDERBOLT, combining twin electric V-Pod propulsion and diesel-electric technology for what the builder calls its “vision of the future for the U.S. inland waterways.”  


Propellers: One Size and Shape Does Not Fit All

A screenshot of the latest version of PropCad

Hydrocomp’s newest release of PropCad incorporates 3 years of enhancements. Propellers are surprisingly complex devices, especially considering most are a solid piece of metal with no moving parts. The variation in vessels and operational requirements leads to wildly different designs


Unidelta: Twin ASD Tugs From Argentina

Brutus - DT Amura estribor

Best known for modern, innovative passenger catamarans, Astilleros Unidelta SA of Buenos Aires is currently building an innovative tug. The aziumthing stern-drive (ASD) ship-handling tug is now being built at the Argentinian yard. The first, in an anticipated series


Editorial: BWTS. Like it or Not, Here it Comes

Gregory R. Trauthwein  Associate Publisher & Editor

With age comes perspective, and in my 20 plus years reporting on this industry I have seen my fair share of regulation that has served to ‘raise the hackles’ of ship owners. It is quite simple really; new regulation often means new procedure, new design, new equipment and new costs


The Art of Propeller Making

The mold is 1,100 degree Celsius liquid bronze is flowing into the prepared propeller mould.to be filled.

The world’s biggest propellers have their cradle in the North of Germany. MMG – Mecklenburger Metallguss GmbH – has manufactured for more than 65 years propellers for ships, including the biggest and fastest, in the State of Mecklenburg-Vorpommern


Maintenance Woes Led to Digby Ferry Grounding

Maintenance deficiencies and inadequate emergency procedures led to November 2013 grounding of Princess of Acadia in Digby, Nova Scotia    Maintenance deficiencies and lack of adequate emergency procedures led to the November 7, 2013 loss of electrical power and grounding of the


'World's First Hybrid Superyacht'

Savannah. Image by Feadship

Developed by Dutch shipbuilders Feadship, the 83.5m Savannah is touted as the world's first hybrid super yacht. Vessel is 30% more fuel efficient than similar sized counterparts, claims the company.   The eco-friendly super yacht uses a blend of a single diesel engine, three gensets


Trearddur Bay Completes Sea Trials

Photo courtesy: BMT Negel Gee

BMT Nigel Gee Ltd, a subsidiary of BMT Group Ltd, has announced that windfarm support vessel Trearddur Bay, its latest design for Turbine Transfers,  has successfully completed sea trials in the Solent, achieving 31 knots with 8 metric tons DWT


Hull Form Optimization Yields Fuel Savings

Wave behind transom is small for the developed hull form without any diverging waves (Image courtesy of Foreship)

Hull form optimization and hydrodynamic design contribute to fuel consumption savings to be achieved by a new generation coastal general cargo ship.   Finnish owner Meriaura Group signed for two 4,700DWT Ice Class 1A VG EcoCoasterTM general cargo newbuilds at Dutch yard Royal Bodewes in


Shipping Not to Blame for Seal Deaths

Image Credit: UK Chamber of Shipping

New evidence has emerged that seal deaths around the UK’s coastal waters are the result of predatory behavior by grey seals, rather than ship propeller injuries, says UK Chamber of Shipping.  Sea Mammal Research Unit researchers observed a grey seal killing five young seals


Volvo Penta IPS: Still Revolutionary

A decade ago, one system single-handedly changed the face of leisure and commercial boating. The game changer Volvo Penta IPS.

  In the first two months of 2005, visitors from all over the world attended the London International Boat Show and Miami International Boat Show, expecting to find the usual selection of boats, equipment and accessories. What they discovered instead was history in the making


Maritime Propeller Repairs Certified for In-Situ Welding

Photo courtesy of MPR

Maritime Propeller Repairs BV (MPR) obtained a DNV-GL certification to perform propeller repairs using in-situ welding, the company announced today. Netherlands-based MPR is now the only company certified for vertical welding on propellers. Most repairs on propeller blades require the removal of


Silentdynamics Enters Rim Thruster Market

Image: Silentdynamics

Rim-driven thruster technology has emerged in recent years, demonstrating its potential for compact and silent maneuvering propulsion.   Early development for this technology performed in Rostock, Germany at the company AIR. The project was then taken over by Voith


Van der Velden Marine Systems: Innovating Efficiency

Photo: Damen

After celebrating its 50th anniversary in 2013, Van der Velden Marine Systems, a daughter company of the Damen Group, is not resting on its laurels as the Netherlands-based company’s R&D department works to continue advancing maritime maneuvering and propulsion efficiency.  






 
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