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Propellers

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

Propellors1 WEB.jpg

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.


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


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


Transport Of A Heavy FP Propeller

In February John Crane-Lips transported one of the world's heaviest fixed pitch propellers from its premises in Drunen to 's-Hertogenbosch. This 6-bladed propeller has a diameter of 8.8 meters and a weight of 92.5 tons. The material of which the propeller is made is Cunial©, an alloy of copper, nickel and aluminum. Upon arrival in 's-Hertogenbosch the propeller was lifted with a large hoisting crane to put it on a barge and was then shipped to the port of Rotterdam


Propulsion News

PBCF Aids Propulsion Efficiency Propeller Boss Cap Fins (PBCF) is a propeller enhancing device, which is designed to cut fuel consumption and exhaust gases by up to five percent while incurring no additional maintenance cost once installed. The unit, according to H. Yumoto Manager of PBCF Div. Mitsui O.S.K. Techno Trade, Ltd., is now operational on 720 ship worldwide. The PBCF rectifies the propeller hub vortex and recovers rotational energy otherwise lost in the propeller slip stream


Wärtsilä' Starts Prop Production in China

The joint venture company set up by Wärtsilä and CSSC (China State Shipbuilding Corporation) in China to design, manufacture and deliver Fixed Pitch Propeller (FPP) packages has officially started operating at the beginning of June 2004. The new company, called Wärtsilä-CME Zhenjiang Propeller Co. Ltd, is 55%-owned by Wärtsilä and 45%-owned by Zhenjiang CME Co. Ltd (CME), the latter being a wholly owned subsidiary of the CSSC.


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


High-Tech Fishing Vessel Delivered with MAN Propulsion

Fishing vessel Herøyhav: Photo courtesy of MAN

Norwegian company Herøyhav AS has taken delivery of a 69.95-m trawler/purse seiner from Karstensens Shipyard, Denmark, equipped with a propulsion package supplied comprising a MAN 9L27/38 engine and a two-speed reduction gear that drives a MAN Alpha 4,200 mm diam. ducted propeller


Reduce Fuel Bills without Going to Drydock

Photo: Hydrex

Propeller buffing is a new technique that aims to keep propellers in optimum condition. The process is not conventional propeller polishing, but a service developed and delivered only by Hydrex. Routine propeller buffing can save 5% from the fuel bill, Hydrex said


EBDG-designed aluminum ferry to be Constructed

Elliott Bay Design Group has designed a  steel hull, aluminum superstructure vessel which will be built  by Nichols Bros Boat Builders for Wahkiakum County.  The 115  ft. x 47 ft. 6 in 23-Car, 100 passenger ferry, named the M/V 


UZMAR’s High-tech Tug Returns from Sea Trials

KOC Musaned-2 (Photo courtesy Uzmar)

The innovative, multipurpose, conventional propeller built, 20.4m in length overall, equipped with various machinery and systems that have never designed or build before, Line Handling Tug returns to UZMAR’s Izmit Shipyard Port on April 5, 2014, after the first stage of sea trials


Van Voorden Completes Big Stainless Steel Propeller Order

Image courtesy of Royal Van Voorden

Van Voorden Castings BV from Zaltbommel, the Netherlands, has just completed a large order for four 25-tonne stainless steel propellers for a Canadian ice class ferry to be built by Italian yard Fincantieri for their client Société des traversiers du Québec.


Ship Design & Engineering: Japan's MHI & Denmark's OMT Collaborate

Image photo CCL

Mitsubishi Heavy Industries, Ltd. (MHI) has concluded an agreement with Odense Maritime Technology A/S (OMT) of Denmark, a provider of ship design services, to collaborate in expanding their licensing business. Under the newly agreed collaborative arrangement


MHI, OMT Enter Shipbuilding Collaboration

Mitsubishi Heavy Industries, Ltd. (MHI) has entered into an agreement with Odense Maritime Technology A/S (OMT) of Denmark, a provider of ship design services, on collaboration in ship engineering business. The companies said they plan to combine abundant track records in shipbuilding business to


HydroComp Celebrates 30 Years

HydroComp, Inc. began as a business venture in 1984 to meet the specific needs of naval architects and shipbuilders in the area of resistance and power predictions. Thirty years later, HydroComp has grown into a multifaceted corporation with clients from design to construction to academia in more


New Wärtsilä Propeller Speeds Up Australian FPSO

An FPSO vessel: Image CCL2

Wärtsilä say that the technical design and installation of a new fixed pitch propeller (FPP)  for the floating production storage and offloading vessel (FPSO) Ngujima-Yin has been successfully completed. The FPSO is operated by Woodside Energy Ltd


Bulletproof Crewboats Delivered in Nigeria

Photo: Incat Crowther

Incat Crowther is pleased to announce that Veecraft Marine has delivered a pair of 20m Monohull Crewboats and signed a contract to build a 30m Wave Piercing Catamaran Crew Boat. Hot on the heels of delivering Magen Defender and Masud Defender


First of 10 Utility Vessels Delivered

Photo: Incat Crowther

Incat Crowther announced the first deliveries of a 10-boat order for 42m Infield Utility Vessels to Brunei’s PTAS Marine. Developed in conjunction with builder Strategic Marine, the project called upon Incat Crowther’s track record in steel crew boats to meet strict performance criteria


SS United States: Leading Lady to Damsel in Distress

This is now ... United States seen from S. Christopher Columbus Blvd., Philadelphia.

Once queen of the express liners, and the fastest, safest and biggest passenger liner in history, the SS United States today quietly awaits rescue from a pending cruise to the scrapyard.  The Big Ship the Big U, the one that didn’t sink. The S.S


New Jack-up Vessel Propelled by SCHOTTEL

Photo: HOCHTIEF

Since December 2013 the fleet of HOCHTIEF has a new member. The offshore jack-up vessel VIDAR was developed especially for construction and servicing of offshore wind farms as well as offshore oil and gas plants. The propulsion system consists of four SCHOTTEL Combi Drives electric azimuth


DNV Introduce Vessel General Permit Enviro-Oil Advisory Service

Photo courtesy of USCG

Classification society and consultancy DNV GL inform it has introduced the "Environmentally Acceptable Lubricants" (EAL) Report Service to help ship operators to comply with the new rules set out for the US Vessel General Permit (VGP) without the need for extensive outlays


VULKAN Offers Special Coupling for Offshore Drives

Image: VULKAN

The focus of this year's product and performance presentation by VULKAN Couplings at the Sea Japan in Tokyo are the specially integrated marine drive solutions for offshore ships. The coupling manufacturer based in Herne, Germany, has been supplying in particular the growing Asian and


 
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