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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


Do Propellers Sing?

The graphic shows the chamfering that goes from a 0.5 or 0.4 radius to the tip of suction side

By Leonardo Montoya, Rice Propulsion, in the January edition of MarineNews Yes, sometimes they sing: Some propellers in service produce a high-pitched noise, often referred to as “singing.” This sound typically is a clear harmonic tone much like a humming or a ringing wine glass. More of an annoyance than anything harmful, the causes of singing are not completely understood. Many theories have been put forward to account for the phenomenon of singing


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


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


LNG Bulker Cements Thordon's Green Future

JT Cements LNG-fuelled cement carried Greenland undergoing sea trials (Photo: Thordon Bearings)

Sea trials aboard Greenland, the world’s first LNG-fuelled short-sea dry bulk vessel, have validated the performance of Thordon Bearings COMPAC propeller shaft solution, indicating that seawater-lubricated bearing systems are applicable to all ship types and are definitely here to stay.


Hempel’s Dynamic Brings Saving for Lemissoler

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Global shipmanagement company, Lemissoler Navigation, via its affiliated and managed company Frontmarine Co. Ltd, has achieved significant fuel savings from coating its newbuild 58,500dwt supramax bulk carriers with Hempel’s Dynamic antifouling product.


Hempel Coatings for Lemissoler Newbuilds

Global shipmanagement company, Lemissoler Navigation, via its affiliated and managed company Frontmarine Co. Ltd, has coated four of its eight newbuild 58,500 dwt supramax bulk carriers with Hempel’s Dynamic antifouling product, and based on its performance


The Next Generation of Hull Performance Management

Hull performance monitoring solutions can offer significant fuel savings potential, a fact that is prompting growing interest from the maritime industry. To spur development and increase awareness of this exciting field, DNV GL and paint manufacturer Jotun have created the Hull Performance &


Blount Boats to Build Chicago Tour Boat

Image: Blount Boats

Blount Boats, Inc. has been contracted to build a 100- x 35-foot steel passenger ferry boat for Shoreline Sightseeing Co., Chicago, Ill.   The proposed 300-plus passenger, Sub-Chapter K vessel was designed by Seacraft Design, LLC, Sturgeon Bay, Wisc


Conflicting Objectives in Ship Design

Figure 1: Detailed geometry for STAR-CCM+ simulation of ship self-propulsion

Enviro, Safety Regulations Conspire to Complicate  the Marine Classification Business “ABS is first and foremost a safety company,” says Richard Korpus, “but safety can arise on many different fronts. It can refer to the safety of a high-valued asset


Cruise Ship Marco Polo Leaves Damen Shiprepair

Photo: DSV

Damen Shiprepair Vlissingen (DSV), part of Damen Shiprepair & Conversion (DSC), has said farewell to Marco Polo, the 800 passenger cruise ship owned by Global Maritime and operated by Cruise & Maritime Voyages.   Launched in 1964 as the Aleksandr Pushkin


Trailing Suction Hopper Dredger Drydocked at Kooiman

The Reimerswaal in the propeller repair dry dock of Scheepswerf Gebr. Kooiman BV (Photo: Kooiman)

The 6,000-cubic-meter trailing suction hopper dredger Reimerswaal was moored for regular maintenance at the end of December 2015, alongside the jetty of Scheepswerf Gebr. Kooiman BV in Zwijndrecht.   The Reimerswaal, having an overall length over of 130


New Tug Delivered for Italtugs

Photo: Sanmar

The delivery of tug Civitavecchia to the Italian tugboat operator Italtugs for its operation at a Sicilian oil terminal represents another milestone in the tchnical cooperation between Sanmar Shipyards in Turkey and the Canadian naval architects, Robert Allan Limited.


Two Incat Crowther Catamaran Ferries for Auckland

Incat Crowther

Incat Crowther reports that construction has commenced at Q-West in Wanganui, New Zealand, on a pair of additional 34m catamaran passenger ferries for Fullers Group Ltd. The new boats will be sister ships to Te Kotuku which was also built at Q-West and delivered in 2014.  


Wartsila India Signs Pact with CSL

Pic: Cochin Shipyard Limited

 Wartsila India, the Indian arm of Finland-based Wartsila Corporation, has signed a Memorandum of Understanding (MoU) with Cochin Shipyard Ltd (CSL) for setting up a containerised self-sufficient workshop.   As per the MOU, Wartsila plans to locate a containerised self-sufficient


Damen Takes on Six Viking River Cruises Vessel Jobs

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Damen Shiprepair Amsterdam (DSAm) reports that it is currently working on a modification and maintenance contract for six inland cruise vessels owned by Viking River Cruises. With this winter service complete, all six vessels – known as longships – will be ready for the coming river


SCHOTTEL Expands Repair Capacity

Photo: SCHOTTEL

The newly extended repair facilities at SCHOTTEL’s German headquarters in Spay are now operational. The space was previously used solely for manufacturing new drives, but now the halls offer 2,200 square meters for the repair of SCHOTTEL propulsion systems


Creating Patterns with PropCad Premium

Pattern Corrections is used to expand and thicken propeller designs to create machining models and casting patterns. Individual control is provided for separate blade parameters. (Image: HydroComp)

The new Pattern Corrections utility allows users to quickly create machining models, casting patterns, and molds DIRECTLY from PropCad   HydroComp announced its PropCad software for the geometric modeling of marine propellers has receieved an upgrade


Inland Vessel Profile: USACE’s Dan Reeves

M/V Dan Reeves (Photo by Richard Dollison)

The newly built M/V Dan Reeves was commissioned in January of 2016 for the United States Army Corps of Engineers (USACE) Little Rock District. Built by Horizon Shipbuilding, Inc., Bayou La Batre, Ala., overseen by the USACE Marine Design






 
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