Marine link
 

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.


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


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

csm_sm14_eingang_b974363432.jpg

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


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


'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


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


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


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


Norwegian Orders Rolls-Royce Propulsion Upgrade

Norwegian Epic (Photo courtesy of Norwegian Cruise Line)

Norwegian Cruise Line has selected a Rolls-Royce permanent magnet tunnel thruster to upgrade the propulsion package onboard cruise vessel Norwegian Epic.     According to Rolls-Royce, the permanent magnet tunnel thruster offers numerous advantages over traditional tunnel thrusters


Rolls-Royce Propulsion for Alaska Class Ferries

Alaska Class Ferry concept

  Rolls-Royce has been selected by the Alaska Department of Transportation and Public Facilities, via its Alaska Marine Highway System, and Vigor Industrial, to provide a highly efficient propulsion system for its future Alaska Class ferries that will be built by Vigor Shipyards in Ketchikan


Great ships of 2014: Siem Moxie

11408.1_SIEM MOXIE web.jpg

The ISV Siem Moxie, an Ulstein SX 163 design not only has been deemed a “Great Ship” in our pages, it has also been awarded the “Offshore Renewables Awards 2014” and the “Innovation Awards” by an international panel.  The Siem Moxie measures 242 x 55.7 ft


Great Ships of 2014: R/V Neil Armstrong - Multifaceted Sea Explorer

 Two ships, $145m GPA designed Diesel Electric propulsion

The Ocean Class Auxiliary General Oceanographic Research (AGOR) vessel hull number 27 started its official life as the R/V Neil Armstrong, the first research vessel named after a space explorer.  The ship was designed by Guido Perla and Associates and built at Dakota Creek Industries (DCI)


Rolls-Royce Propulsion for New Alaskan Ferries

Image courtesy of Rolls-Royce

The new Alaska Marine Highway System ferries, to be built by Vigor Industrial, will feature Rolls-Royce propulsion systems.   Rolls-Royce has been selected by the Alaska Department of Transportation and Public Facilities, via its Alaska Marine Highway System, and Vigor Industrial


Rolls-Royce wins AK Ferry Propulsion Contract

Rolls-Royce has been selected by the Alaska Department of Transportation and Public Facilities, via its Alaska Marine Highway System, and Vigor Industrial, to provide a highly efficient propulsion system for its future Alaska Class ferries that will be built by Vigor Shipyards in Ketchikan, Alaska


Great Ships of 2014: The Hybrid-Powered Semper Fi

Semper Fi

The MV Semper Fi  from the Netherlands is an innovative European inland waterway vessel measures 361 x 37.7 x 12.1 ft. (110 x 11.5 x 3.7 m). In cooperation with MARIN, the Netherlands Maritime Research Institute in Wageningen, the Dutch shipping company Carpe Diem Shipping developed the


Great Ships of 2014: Al Kout Environmental, Piracy Protected, Proven

H.5392 web.jpg

The KOTC operated crude oil tanker Al Kout is the fourth sister Very Large Crude Carrier (VLCC) of 317,300 DWT, part of the KOTC Phase III of the fleet newbuilding projects. The vessel has been designed and built under the survey of NK class and distinguished in the register by the following


Tsuneishi Builds 200th Kamsarmax Bulk Carrier

Ultra Lion (Photo: Tsuneishi Shipbuilding)

Tsuneishi Shipbuilding Co., Ltd. finished building an 82,000-mt D/W type bulk carrier Ultra Lion on January 7, 2015, marking the completion of the builder’s 200th Kamsarmax model vessel.   Built by Tsuneishi Group Shipbuilding, Inc


‘Seawater is the Ultimate EAL’

Cost comparison of stern tube lubricants (Image courtesy of Thordon Bearings)

Thordon Bearings: “Seawater is the only commercially viable EAL for propeller shafts”   Thordon Bearings Inc., a manufacturer of seawater lubricated bearings for the global marine industry, has questioned the rise of environmentally acceptable lubricants (EALs) in oil-based


DSME Returns for More Dual-Fuel Engines

5G70ME-GI (Eric Haun).jpg

MAN Diesel & Turbo received an order for four MAN B&W 5G70ME-GI engines in connection with Daewoo Shipbuilding & Marine Engineering Co.,Ltd. (DSME) agreeing a deal with the BW Group to build two LNG carriers. The technical engine specification complies with IMO Tier II






 
rss feeds | archive | privacy | history | articles | contributors | top news | contact us | about us | copyright