Scana Propulsion has utilized its long

experience and know-how in propeller

design and documented well the

performance of Scana Propulsion High

Efficiency nozzle (Scana HE nozzle).

The characteristics of the

Scana HE nozzle gives best

performance in bollard condition

and at higher speeds.

PROPULSION

CREATING PROGRESS

INCREASED THRUSTLOWER NOISE REDUCED SIZE

Scana Propeller Nozzles Optimizing propulsion efficiency by applying the best nozzle profile

Scana Propulsion AS // Scana Propeller Nozzles // propulsion@scana.no // www.scana.no // Rev 2 // 150415

UP TO 30% HIGHER

THRUST AT LOW SPEED COMPARED TO AN OPEN PROPELLER

Tailor-made propulsion for your vessel Optimizing the propeller for each individual vessel

Left: Typical example of propeller thrust with and

without nozzle at 100% MCR.

What does a nozzle do?

A nozzle increases the thrust at low speed. This is

essential for tugs, trawlers and anchor handlers. At

low speed, the thrust may be increased by up to

30% by using a nozzle propeller. A nozzle will also

give higher thrust to a vessel with blunt hull lines

and high wake.

Scana Propulsion AS // Scana Propeller NozzlesPage 2

Scana has utilized its vast experience in

evaluating the performance of the Scana

Propulsion High Efficiency nozzle compared

to the 19A nozzle which is considered to be

the market standard.

Bollard Pull

The Scana HE nozzle shows up to 5%

higher performance in bollard pull conditions

compared to the 19A nozzle. The reason for

this is that the profile of the Scana HE nozzle

has a bigger outer diameter than 19A nozzle

at the same propeller diameter.

Trawling

The performance of the Scana HE nozzle is

slightly better than the 19A nozzle in trawling

condition.

Low Transit Speed

At lower transit speed the 19A nozzle shows

higher performance than the Scana HE

nozzle. However, with increasing speed the

Scana HE nozzle improve its performance.

Additional in-depth information is available

for customers.

The Scana HE nozzle is specifically designed to increase the thrust from the propeller in bollard pull conditions

propulsion@scana.no // www.scana.no Page 3

37 nozzle profileThe 37 nozzle is recommended for vessels with high priority to astern performance. The forward bollard pull will be at the same level as for the 19A nozzle, but at higher speed the performance is not competitive compared to the 19A nozzle.

Pay special attention to the red area with flow separation at exterior side near the leading edge and the vorticity formation and detachment at the trailing edge. The flow separation shown reduces the efficiency. The blunter trailing edge contribute into higher form resistance of this duct type.

19A nozzle profileThe 19A nozzle is recommended for many installations since it has a good overall performance in different running conditions.

Pay special attention to the red area with flow separation at exterior side near the leading edge. The flow separation shown reduces the efficiency.

Scana HE nozzle profileThe Scana HE nozzle is recommended for ships with high bollard pull requirement, and low propeller loading at higher speed. The Scana HE nozzle has also better astern performance than the 19A nozzle.

Pay special attention to the vorticity formation and detachment at the trailing edge. The blunter trailing edge contributes to higher form resistance of this duct type.

High Transit Speed

The below illustrations show the water velocity distribution around the three different nozzle profiles in high transit speed. The Scana

HE nozzle shows significantly better performance than the 19A and the 37 nozzles. Both the 19A and the 37 nozzles show higher flow

separation which reduces the efficiency, and in addition the blunter profile of the 37 nozzle leads to higher form resistance.

During the evaluation process of the Scana HE nozzle several CFD (Computational Fluid Dynamics) calculations were made in

investigation of characteristics of the nozzle profiles.

Vast experience and know-how Configurable nozzle designs with over 100 years of propulsion experience

The information in this brochure contains, or may be deemed to contain ‘forward-looking statements’. These statements might relate to future events or our future financial performance, including, but not limited to, strategic plans, potential growth, planned operational changes, expected capital expenditures, future cash sources and requirements, liquidity and cost savings that involve known and unknown risks, uncertainties and other factors that may cause Scana or its businesses actual results, levels of activity, performance or achievements to be materially different from those expressed or implied by any forward-looking state-ments. All forward-looking statements made in this brochure are based only on information presently available in relation to the information contained in this brochure and may not be current any longer. Scana assumes no obligation to update any forward-looking statements. Nothing in this brochure constitutes invest-ment advice and this brochure shall not constitute an offer to sell or the solicitation of an offer to buy securities or otherwise to engage in any investment activity.

Pictured above: Scana tailor-made propeller in a Scana HE nozzle installed on an Anchor Handling Tug Supply Vessel

Over the last few years, Scana Volda has invested a lot in

exploring the scalable effects of nozzle propellers. From 2013

until 2016 we have been part of the Propscale Research

Project at Marintek.

One of the primary focuses in this project is the scalable

effect on nozzle propellers in different speed regimes and with

different propeller blade designs.

Affiliates such as the Technical University of Hamburg and

China Scientific Research Centre are also participating in this

project alongside the Norwegian community.

Up to 30% higher thrust at low speed

PRIMARY ADVANTAGES

Lower vibration and noise level in the ship

Less speed reduction in head sea/wind

Better course stability

Reduced optimum propeller diameter

Reduced size of propeller hub

Propscale