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

Technology

Virtual AIS Beacons Employed in MH370 Search

Vesper Marine, a manufacturer of marine safety products and virtual Aids to Navigation (ATON), announced that its Virtual AIS Beacons are employed in the search

Alu Design to Create Next Generation of Marine Chairs

There’s a new designer in the driving seat at Alu Design. Per Ivar Selvaag, the former Lead Designer at BMW Group and Chief Designer of Peugeot’s concept car division,

New Dual Use Piracy Barrier Launched

Guardian Maritime launched Guardian Greenwater, a new product that was developed to deal with the issue of greenwater on-board deck following turbulent weather conditions,

Shipbuilding

VT Halter Begins Building LNG-powered ConRo Ships for Crowley

VT Halter Marine, Inc., a subsidiary of Vision Technologies Systems, Inc. (VT Systems), has commenced construction on the first of two liquefied natural gas (LNG)-powered,

New Research Vessel Delivered on the Great Lakes

The new oceanographic research and fisheries assessment vessel, Arcticus, completed her sea trials and was delivered to the U.S. Geological Survey's Great Lakes Science Center on October 17.

US Navy Christens Future USS Detroit

The U.S. Navy christened the future USS Detroit (LCS 7), the fourth Littoral Combat Ship of the Freedom variant, in a ceremony at Marinette Marine Shipyard in Marinette, Wisconsin, Oct.

News

PDVSA Charters Another Algerian Crude Cargo

Venezuela's state-run oil company PDVSA has hired a supertanker to load a second 2 million-barrel cargo of Algerian crude, according to preliminary tanker fixture data.

Video: USCG Medevacs Navy Sailor off Virginia

The U.S. Coast Guard (USCG) medevaced a man Wednesday from a Navy vessel off the Virginia coast after watchstanders at Coast Guard Sector Hampton Roads in Portsmouth

VT Halter Begins Building LNG-powered ConRo Ships for Crowley

VT Halter Marine, Inc., a subsidiary of Vision Technologies Systems, Inc. (VT Systems), has commenced construction on the first of two liquefied natural gas (LNG)-powered,

Marine Equipment

Virtual AIS Beacons Employed in MH370 Search

Vesper Marine, a manufacturer of marine safety products and virtual Aids to Navigation (ATON), announced that its Virtual AIS Beacons are employed in the search

ISS Manages Heavy-lift Project at Port of Mombasa

Inchcape Shipping Services (ISS) announced it has completed another complex heavy-lift project in Africa, this time at the Port of Mombasa in Kenya. ISS was

New Gate Transits the Panama Canal

The first gate for the new locks in the Pacific side began transit Wednesday morning through the Panama Canal, signaling another historic milestone in the progress of the Expansion Program.

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 Standards Navigation Offshore Oil Pipelines Pod Propulsion Port Authority Ship Repair Sonar Winch
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: 0.5270 sec (2 req/sec)