DMC Builds the Smallest Ever Nozzle

Posted by Irina Tabakina

Damen Marine Components (DMC), part of Damen Shipyards Group, said it smashed its propeller nozzle world record by 33 percent downwards. This downsizing to an inside diameter of 665 mm— 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 an 8m inside diameter. The two 665mm nozzles weigh 188 kilos each and were built for one 50 ft. (15m) yacht. 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.
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.


(As published in the September 2014 edition of Maritime Reporter & Engineering News -

Maritime Reporter Magazine, page 70,  Sep 2014

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Maritime Reporter

First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.