DMC Builds the Smallest Ever Nozzle

By Eric Haun
Friday, July 18, 2014
Photo courtesy of Damen

Damen Marine Components (DMC), part of Damen Shipyards Group, announced it has smashed its propeller nozzle world record by 33 percent downwards. This downsizing to an inside diameter of 665 millimeters only - from the previous 1,000 mm ‘entry level model’ - marks a new milestone for DMC’s Optima Nozzle series.

Already one-third smaller than the previous one meter (1,000mm) Benjamins, the new 65 centimeter nozzles are, however, dwarfed altogether by the biggest models in the Optima series. With their 8 meter inside diameter, these exceed the two 65 centimeter ones twelvefold.

The two recently delivered smallest ever Optima nozzles may not constitute precision mechanics in the true sense. “They definitely offered a fine engineering and precision manufacturing challenge to our teams indeed,” said Aart Vogelaar, Sales Manager DMC.

The two record-breaking 665mm nozzles weigh 188 kilos each and were built for one 50 foot (15m) yacht. “By specific orders from the customer, DMC Optima propeller nozzles had to be installed. In addition, the owner wanted his 11-knot yacht to have two propellers. Clearly, he is somebody who knows his business, considering this explicit and uncompromising choice which also included a stainless steel inside ring. Definitely an insider,” Vogelaar added.

The two mini Optimas were commissioned at Damen Marine Components by a third-party manufacturer of propulsion systems.

DMC’s Optima propeller nozzle combines reduced noise and vibration with propelling performance. Its specific inside profile design was patented in 1998. Thousands of units have since established the Optima’s reputation as the nozzle for mixing crew comfort with performance within its own operational segment. “Its profile was designed towards an optimum ratio between engine output, fewer revolutions and thrust, both forward and reverse”, Vogelaar said.  As this works best at modest to medium sailing speeds, this model - with the matching propeller pitch - is widely deployed in inland waterway vessels, Stan Tugs, push boats and hopper dredgers. Its noise/vibration/thrust performance mixture is the Optima’s trademark.

For dredgers, Stan Tugs or inland waterway vessels, DMC’s Optima nozzles usually have an L/D 0.5 ratio (length = 0.5 x diameter). For push boats the L/D is 0.6. The two world’s smallest nozzles feature L/D 0.4 in order to still safeguard ‘crew comfort’ at the river yacht somewhat higher 11 knot speed. Like every DMC nozzle, these two were engineered separately at the DMC center in Hardinxveld-Giessendam, Netherlands. Vogelaar explained, “No two vessels are the same, not even with identical dimensions. Consequently, every nozzle we produce, will get dedicated engineering first, for optimum output.” 

damen.com
 

Maritime Reporter September 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Marine Propulsion

Moore Stephens Expects Vessel Operating Cost to Rise

Vessel operating costs are expected to rise by almost three per cent in both 2014 and 2015, according to a new survey by international accountant and shipping consultant Moore Stephens.

Wärtsilä Steerable Thruster Gets Class Approval

DNV-GL approved the design of the Wärtsilä WST-14 thruster, significant as approval was granted based on a thruster design that has yet to be introduced into full series production.

John Deere Expands Tier 3 Engine Line

John Deere Power Systems (JDPS) has introduced new propulsion ratings to its EPAMarine Tier 3 engine offerings. The new PowerTech 4045TFM85 propulsion ratings expand

Shipbuilding

Rederij Groen Takes Delivery of 7-Waves

Rederij Groen’s entire SRSV fleet built by Damen Maaskant Shipyards Stellendam. Dutch offshore services company Rederij Groen has taken delivery of the 7-Waves,

De Beers Orders Specialized Ship from Kleven

Kleven signed a contract with diamond company De Beers Marine Namibia, part of De Beers Group, on the building of a highly specialized vessel for deep water mineral exploration.

FMT Options for another Towboat from Eastern

Eastern Shipbuilding Group, Inc. announce that Florida Marine Transporters, Inc. of Mandeville, La. exercised another additional 90’x32’x10’ “Canal Class” Inland

Marine Power

John Deere Expands Tier 3 Engine Line

John Deere Power Systems (JDPS) has introduced new propulsion ratings to its EPAMarine Tier 3 engine offerings. The new PowerTech 4045TFM85 propulsion ratings expand

Caterpillar: Q3 Results Show Improvement

Caterpillar Inc. today announced its third-quarter results, in which it reported profit per share of $1.63 for the third quarter of 2014, an increase from third-quarter 2013 profit per share of $1.

ABB: Remote Monitoring Link to Fuel Efficiency

Anticipating the maintenance of equipment on board ships in order to increase fuel efficiency could be a “real game changer in the future,” said Andreas Zito, chief technical officer of the V.

News

WFW Advises ING Bank on $340m Loan Facility for Euronav

Watson, Farley & Williams (WFW) has advised ING Bank N.V. (ING) as sole bookrunner and facility agent for a syndicate of banks on a $340 million loan facility made available to Euronav NV.

UN Authorizes Ship Inspections Near Somalia For Arms, Charcoal

The United Nations Security Council authorized the inspection of boats suspected of carrying illegal shipments of charcoal or weapons to and from Somalia on Friday,

Clean Marine Wins New Contract

Clean Marine has been selected by Hyundai Mipo Dockyard in South Korea to supply exhaust gas cleaning systems (EGCS) for two new MR tankers. IMO’s convention

Marine Equipment

Kalmar 5th Generation Gloria Reachstackers Enter US

Kalmar, part of Cargotec, is launching its highly acclaimed range of reachstackers, called Gloria into the Americas. The eagerly awaited launch follows the successful

John Deere Expands Tier 3 Engine Line

John Deere Power Systems (JDPS) has introduced new propulsion ratings to its EPAMarine Tier 3 engine offerings. The new PowerTech 4045TFM85 propulsion ratings expand

Caterpillar: Q3 Results Show Improvement

Caterpillar Inc. today announced its third-quarter results, in which it reported profit per share of $1.63 for the third quarter of 2014, an increase from third-quarter 2013 profit per share of $1.

Yachts

Pink Lashings Raise Money for Breast Cancer Research

As the first Peters & May Pink Lashings shipment leaves Palma for Fort Lauderdale, the global marine transport company is calling all yacht owners to support its campaign to help raise £25,

Ocean Training Launches Blended Learning Course

Major revisions to the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (The STCW Convention) came into force in 2012.

The Hydroptere Flies with Finesse

The hydrofoil trimaran Hydroptere will try for another nautical record with support from biotechnology leader Finesse Solutions After a year resting in Long Beach,

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Navigation Offshore Oil Pipelines Port Authority Salvage Shipbuilding / Vessel Construction Sonar
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1823 sec (5 req/sec)