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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.


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


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


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


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


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


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


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


Push Boats: From Turkey to Brazil

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The shallow draft market in South America continues to strengthen, powered by orders such as Hidrovias do Brasil S.A. 2013 deal for eight HB Pushboat ASUNCION-PYs, which represents a new generation of powerful Shallow Draft River Push Boat designed specifically for South America inland waterways


Next Gen Tankers Delivered to Concordia Maritime

Stena Image (Photo courtesy of Concordia Maritime)

Concordia Maritime takes delivery of the next generation of chemical and product tankers   Concordia Maritime’s first chemical and product tanker based on the IMOIIMAX concept, the Stena Image, was delivered from the Chinese shipyard GSI (Guangzhou Shipbuilding International) in


Detyens Wins $15.8m Ship Repair Contract

USNS Lewis and Clark (Photo: U.S. Navy Military Sealift Command)

Detyens Shipyards, Inc. has been awarded a $15,812,647 firm-fixed-price contract from the U. S. Navy’s Military Sealift Command for a 75-calendar day shipyard availability for the regular overhaul and drydocking of USNS Lewis and Clark (T-AKE 1).  


New Player in the Rim Thruster Market

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Rim-driven thruster technology has emerged and demonstrated potential for compact and super-silent maneuvering propulsion.   Silentdynamics customized rim-thruster-based propulsion solutions applications include tunnel thrusters, and Silentdynamics ERT thrusters can be configured to be


Nakashima Propeller, ClassNK Hold Joint Seminar

Nakashima Propeller and ClassNK held a joint technical seminar in Hamburg on March 19.   Nakashima Propeller and ClassNK, from their respective roles in the industry, provide products and services to support ships through their lifecycle


DNV GL Launches Hull, Propeller Analytics

DNV GL is will launch a hull and propeller performance analytics module as part of the new fleet performance management service ECO Insight. The module is based on computational fluid dynamics (CFD) methods to correct for changing operational conditions and produces much more accurate results than


Shipbuilding for the Arctic

(The following excerpt by Authors: S Navaneetha Krishnan & Antony Prince) The Arctic region has a huge potential in terms of unexploited natural wealth and resources, though it accounts for a small area on the earth’s surface. Many countries


Wärtsilä Dual-fuel Engines for Baltic Sea Ferry

Tallink Shuttle

  A new fast ropax ferry ordered by the Estonia based Tallink Grupp for its Tallinn - Helsinki route, will feature Wärtsilä dual-fuel engines running primarily on liquefied natural gas (LNG). The ship is to be built at the Meyer Turku shipyard in Finland and is scheduled to be in


Thordon Bearings COMPAC System for Britannia

P&O Cruises Britannia features a water-lubricated COMPAC propeller shaft system (Photo: Thordon Bearings)

Thordon Bearings seawater-lubricated COMPAC propeller shaft system given royal ‘seal’ of approval    P&O Cruise’s new flagship Britannia was officially christened by the Queen yesterday at a naming ceremony in Southampton, U.K.  


SCR Systems Chosen for Newbuild Trawlers

Graphic representations of the Nautic wetfish trawler design for HB Grandi. Each vessel will be powered by an MAN six-cylinder L27/38 unit, accompanied by a four-bladed, 3.8-metre, ducted MAN Alpha VBS 860 propeller (Image courtesy of HB Grandi/Nautic)

Three wetfish trawlers being built for Icelandic fishing company HB Grandi will feature MAN SCR Selective Catalytic Reduction (SCR) system in addition to MAN main engines. MAN Diesel & Turbo states that the system will enable the trawlers’ IMO Tier II-compliant engines to fulfill the IMO


Viking Neptun Delivered for Technip

Photo: Fuglefjellet AS

Viking Neptun was delivered from Kleven Verft to Eidesvik on February 17, and the naming ceremony was held in Stavanger on February 28. The vessel’s Godmother, Patricia Pilenko, broke the champagne bottle on Viking Neptun, which will now start operating on charter for Technip in the North


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


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


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.”  


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






 
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