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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


Wärtsilä Propellers to Drive Greek Tankers

A Wärtsilä Fixed Pitch Propeller fitted with the EnergoProFin. Photo Wartsila

TMS Tankers Ltd, one of the largest Greece based shipping fleet operators, has selected Wärtsilä fixed pitch propellers (FPPs) for its new vessels under construction in China. The order was placed with Wärtsilä's joint venture company in China, Wärtsilä CME Zhenjiang Propeller Co Ltd (WCME), in December 2015. Other leading Greek shipping companies have also recently opted for Wärtsilä FPPs.


Quick Propeller Repair Prevents Drydocking

One of the propeller blades was missing parts of its tip. (Photo: Hydrex)

Recently a team of Hydrex diver/technicians performed a propeller blade cropping on a 190-meter container bulker berthed in Hamburg. Two parts of the tip of one of the four propeller blades were damaged and needed to be cropped to restore the propeller’s efficiency.    Having developed different procedures for different kinds of damage, Hydrex teams are equipped and trained to make the best out of a bent or broken propeller


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


Tech File: Vesconite Rudder Bushings

Photo: Vesconite

South American river tugboats need robust rudder bushings: some 20 tug boats on the Parana River, running through Brazil, Paraguay and Argentina, have been equipped with Vesconite rudder bushings.   In the challenging waters of South American rivers


Delay Averted with Underwater Sterntube Renewal

Photo: Hydrex

Hydrex Underwater Technology has assisted an excavation vessel hemorrhaging oil from a stern tube seal entangled with steel wire to pass safely through the Panama Canal. The 156m long, Dutch-owned vessel was unable to make the canal transit until the propeller shaft seal had been repaired


Tug Huron Goes to Work in Duluth

Photo: Kenneth Newhams / Great Lakes Towing Company

The Great Lakes Towing Company said it has repositioned its Tug Huron to Duluth, Minn. on Monday, January 2, 2017 to enhance capabilities for icebreaking, harbor assist and other services essential to commercial shipping in the Duluth-Superior region.  


Two Turkish-built Tugs Delivered in Canada

Two newly built custom tugboats have been delivered to Canadian based SNC Lavalin to operate during the construction of Montreal's New Champlain Bridge on the Saint Lawrence River.   The new vessels, one 13 meters long and the other 15 meters long


Polar Cruise Ships to Feature Rolls-Royce Green Tech

Image: Rolls-Royce

Norwegian explorer cruise line Hurtigruten is to build two new expedition ships using a new and environmentally sustainable hybrid technology from Rolls-Royce making fully electric propulsion on a passenger ship possible.   The Rolls-Royce designed MS Roald Amundsen and MS Fridtjof Nansen


Jotun:ISO 19030 standard can make $30 bln impact on the industry

Geir Axel Oftedahl, Jotuns Business Development Director - HPS Photo Jotun

The International Organization for Standardization (ISO) has now published the long-awaited ISO 19030, a new standard conceived to measure changes in ship-specific hull and propeller performance. According to Jotun, which has led the industry in the standard’s development


ROBA-DS Shaft Couplings Certified by DNV GL for Offshore

Image source shutterstockam70

The compact and high performance ROBA-DS disk pack couplings by mayr power transmission have been certified by DNV GL. They ensure maximum possible operational and functional safety for users on the high seas. Whether in the drives of ship propellers


Wärtsilä EnergoProFin for CPP, FPP

Wärtsilä EnergoProFin energy saving solution increases propeller efficiency and creates fuel savings of up to five percent. Photo Wartsila

Wärtsilä EnergoProFin is a state-of-the-art energy saving solution that increases propeller efficiency and creates fuel savings of up to five percent. The solution is now available for both controllable pitch propellers (CPP) as well as fixed pitch propellers (FPP)


ZAMAKONA Completes "J UAN THING" Refit

Juan de la cosa Photo SHIPYARD ZAMAKONA PASAIA

Shipyard Zamakona Pasaia completed last week the repair and maintenance of health dry rescue ship and maritime assistance "JUAN THING" the Social Marine Institute.   The ship 75 meters long by 14 meters wide, has required the implementation of various repairs and general


Korara: New Ferry Delivered to Fullers Group

Photo: Incat Crowther

Korora, the first of a two vessel repeat order following the operational success of Te Kotuku, delivered in 2014, was recently delivered.   Korora is a 34m catamaran, a collaboration between operator Fullers Group Ltd., designer Incat Crowther and builder Q-West


Rolls-Royce to Propel New Danish Ferry

Photo: Mols-Linien

Danish ferry operator Mols-Linien has ordered a new passenger ferry from the Rauma Marine Constructions yard in Rauma, Finland. Rolls-Royce will provide the main propellers and propulsion control system to the new ship, which is planned to operate between mainland Denmark and the island of Bornholm


World’s First Full Scale Numerical Modelling Workshop

Ship scale CFD simulation made with StarCCM+ code (Photo: Lloyds Register)

Lloyd’s Register (LR) hosted the world’s first workshop on full scale hydrodynamic computer simulations at their Global Technology Center in Southampton last month. Ship designers from around the world came together with the aim of building confidence in the accuracy of ship scale


Great Ships of 2016: Sunray

(Photo: SungDong)

Since it started publishing in 1939, Maritime Reporter & Engineering News has recognized excellence in ship construction. This year 18 ships in total were honored, including many “world firsts.”   Sunray - First of Two Dual Class Tankers for TEN


Great Ships of 2016: Milos

(Photo: SungDong)

Since it started publishing in 1939, Maritime Reporter & Engineering News has recognized excellence in ship construction. This year 18 ships in total were honored, including many “world firsts.” Milos - Suezmaz crude oil tanker  


New Workboat for Oil Spill Response

(Photo: SWB)

An all new workboat, produced by the Portuguese company SWB, Seismic Workboats, Lda headquartered in Peniche, has been designed and developed by engineering teams from Portugal, England, the U.S. and Norway and built at Peniche Shipyard.  






 
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