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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


MAN Propulsion Packages for New Trawler Series

The new trawler for Vinnslustodin hf. and Hradfrystihusid Gunnvör was designed by Skipasýn and will be built by Huanghai Shipbuilding Co. Ltd. (Image: MAN)

Orders for five fresh-fish trawlers feature two different ship designs and MAN 6L27/38 engines and aft-ship equipment Icelandic owners, HB Grandi, Vinnslustodin hf. and Hradfrystihusid Gunnvör, have ordered newbuildings based on two different ship designs from specialist fishing-vessel


Rolls-Royce Secures Island Offshore Contract

VARD shipyard in Brevik

Rolls-Royce has won a $11.3 million order to provide design, integrated power and propulsion systems and equipment for an offshore service vessel for Norwegian ship owner Island Offshore. The offshore service vessel will be built at VARD shipyard in Brevik


DSME Returns for More Dual-Fuel Engines

Graphical rendering of an MAN B&W 5G70ME-GI engine (Courtesy of MAN Diesel & Turbo)

Four two-stroke ME-GI engines ordered for two LNGCs. MAN Diesel & Turbo has 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.


USCG & Fishermen save Sinking Boat

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  A Coast Guard search and rescue team and a local fishing crew worked together Saturday to save a fishing boat from sinking near Great Wass Island, Maine. Watchstanders at the Sector Northern New England Command Center in Portland


PEMEX Invests in Nine Voith Water Tractors

Photo courtesy of Voith

Mexico’s state-owned petroleum company PEMEX (Petróleos Mexicanos) invests in a modern tug fleet. Voith was awarded to supply the propulsion for nine new Voith Water Tractors (VWT) which are to enhance the safety of oil tankers entering and clearing port at several terminals as of


9 new Voith Water Tractors for safety at Mexican OTs

Voith Water Tractors

  Mexico’s state-owned petroleum company PEMEX (Petróleos Mexicanos) invests in a modern tug fleet. Voith was awarded to supply the propulsion for nine new Voith Water Tractors (VWT) which are to enhance the safety of oil tankers entering and clearing port at several terminals


Wärtsilä Debuts Controllable Pitch Propeller System

The new Wärtsilä CP propeller system offers greater efficiency and a reduced environmental impact.

At the SMM exhibition and conference in Hamburg, Germany, Wärtsilä is introducing its latest development of large Controllable Pitch (CP) Propellers, based on the previously known E-hub type. The new CP propeller system offers greater efficiency and a reduced environmental impact.


Caterpillar Debuts MaK M 25 E Engine Platform

MaK M 32 E engine platform

Efficient power solution can deliver up to $250,000 in fuel savings for offshore supply vessels Caterpillar Marine announced the launch of the MaK M 25 E engine platform at the 2014 SMM Exhibition, held September 9 -12 in Hamburg, Germany


First Havyard WE Design Delivered to Fafnir Offshore

Havyard Ship Technologys build 120 Polarsyssel, a Havyard 832 L WE design, 2

  Havyard Ship Technology's build 120 'Polarsyssel', a Havyard 832 L WE design, was delivered to Fafnir Offshore yesterday. It will go straight on assignment for the Governor of Svalbard In March 2013, Havyard signed a contract with Icelandic shipping company Fafnir Offshore for the building


TORM Contracts Albwardy for Diving Services

Propellor polishing (photo by AME)

Danish product tanker carrier TORM A/S and UAE-based Albwardy Marine Engineering (AME), an Albwardy-Damen JV, have signed a Service Level Agreement for diving services in the UAE region. The purpose is to further strengthen their relations and respective commercial reliability


MN 100: Twin Disc, Inc.

Twin Disc BCS Hydraulic Thruster EH.jpg

1328 Racine Street Racine, WI 53403 Telephone: 262 638 4000 Web: www.twindisc.com President and CEO: John H. Batten Number of employees: 990 The Company: Twin Disc designs, manufactures and distributes heavy-duty power transmission equipment for a wide range of marine applications


MN 100: Thordon Bearings Inc.

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3225 Mainway Burlington, State ON Canada L9C5J8 Tel: (905) 335-1440   Email: craigc@thordonbearings.com  Website: www.thordonbearings.com President & CEO: Terry McGowan The Company: Thordon Bearings Inc. designs and manufactures a complete range of polymer bearing


3D Scanning Speeds Up Drag Boat Racing

Photo courtesy of Lucas Oil

NVision, Inc., a company in 3D laser scanning and reverse engineering for over 24 years, said it was able to help a motorsports boat designer optimize the design of the custom-built propellers created for its Top Fuel Hydro drag boat. The boat is equipped with two custom-designed and handmade


MN 100: ZF Marine Propulsion Systems

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15351 SW 29th St. Ste 300 Miramar, FL 33027 Telephone: 786 417 3496 E-mail: edward.schwarz@zf.com Website: www.zfmarinecc.com CEO/President: Wolfgang Schmid Number of Employees: 100 The Company: ZF Marine supplies propulsion system components for yachts, defense craft, high-speed ferries


New Possibilities for Imaging Measurement

Wim Lafeber

With its staggering ability to show displacements of submillimeter scale to stern waves of several meters high, the Digital Image Correlation technique has been applied on a  wide range of projects at MARIN. Examples from research programs in controlled conditions and full-scale trials are






 
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