Operating speed between 0-10 knots

Ducted Propeller (Nozzle)

A ducted propeller is the best solution when the operating speed of the vessel is below 10 knots (18,5 km/h). Due to the shape of the nozzle around the propeller, it acts like an airplane wing, where the water speed around the wing shape generates extra thrust due to the ‘lift’ effect of the nozzle.

Optimizing
performance

The lift force generated by the water flow around the nozzle can develop around 50% of the propeller thrust at zero speed. The resulting force generated by the lift of the nozzle minus the resistance of the nozzle decreases when the water speed increases. The propeller diameter with a nozzle is smaller than an open propeller since the nozzle needs space as well. To take not too much space, the propeller diameter is smaller which makes that it has a higher blade load and brings a higher water speed through the nozzle which enlarge the effect of the lift force of the nozzle.

Efficiency
by design

Current Motion has designed their thrusters with maximum efficiency in mind, so the maximum diameter which can be chosen is the optimum propeller diameter in relation to the load and low speed. It is possible to use a smaller propeller diameter, which creates a smaller system diameter as well, for lower power or faster vessel speeds. However, above approx. 13 knots the resistance of the nozzle creates more drag than the gain of thrust due to this nozzle.

Product features

Increased efficiency

A nozzle around the propeller of an Azimuth thruster enhances its efficiency. It directs water flow better, creates lift force, and improves thrust performance. This leads to fuel savings and lower operating costs, especially at low vessel speeds.

Enhanced maneuverability

The vessel's maneuverability is improved with the nozzle design, enabling precise control of thrust direction in confined areas such as harbors, ports, and narrow waterways.

Improved bollard pull

A nozzle added to the Azimuth thruster increases bollard pull and enables the vessel to exert more force during towing or adverse weather. This enhances the vessel's versatility and capabilities.

Noise reduction

The nozzle design reduces turbulence and vibration around the propeller, resulting in a quieter onboard environment for passengers and crew, enhancing comfort and safety.

Technical information

Data sheet

Type	Power kW	Max. Prop diam mm	Gross Thrust BP kN
CMA50N	53	400	9,4
CMA100N	115	575	19,5
CMA150N	150	660	25,3
CMA220N	220	810	37,5
CMA300N	310	940	51,9
CMA400N	410	1090	67,3
CMA500N	520	1220	87,8

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Let’s
make waves
together

Arij Huijser
Commercial director

Call
+31 612 585 160

Mail
huijser@currentmotion.nl

Open Propeller