Steerprop’s response to COVID-19

At Steerprop, the well-being and safety of our customers, partners and employees are of our highest concerns.

Due the rapid spread of the coronavirus disease (COVID-19), Steerprop has encouraged its employees to work remotely, avoiding travel and face-to-face meetings. Our production unit is running with fewer personnel to secure that our deliveries run as smoothly as possible.

Spare part sales and deliveries will take place as usual. Emergency spares will be sent out during the same day, but non-urgent deliveries may take some additional time due to the situation.

If this situation extends, it may be difficult for us to receive parts from our suppliers, causing delays in our outbound deliveries.

Steerprop Care data analyzing service will not be affected. Only short delays may be possible in our scheduled reporting process. Our Steerprop Service 24/7 number can be reached at all times.

During this unusual time, we are fully committed to providing you with the best customer care and service possible. All of our team members can be reached by phone or email and are happy to answer your questions.

Open positions in design team

We are looking for reinforcement to join our Steerprop team in Rauma:


You are a Mechanical Engineer or M.Sc., a confident user of 3D design software and know the basics of material strength calculations.

You have at least three years of experience in machine and equipment design and are willing to work with the mechanical development of demanding and versatile products. You will be involved in the development of new products, as well as designing project-specific applications.

You have good social skills and are a persistent and focused planning professional. You can effectively manage technical functionality and can work under tight schedules and changing conditions.

Strong written and spoken English is necessary, and other languages are an advantage.

For more information:
Jari Vanhatalo, tel. +358 44 7501116. Contacts from 9 a.m. to 12 noon.

Please send your application with your salary request and curriculum vitae, by email for confidential review to



You are a Mechanical Engineer or M.Sc. and a confident user of 3D design software. You have experience in machine and equipment design and are willing to work with the mechanical development of demanding and multifaceted products. Basic knowledge of hydraulics and machine dynamics is an advantage.

As a member of an experienced development team, you get to take part in new product development and designing project-specific applications. The position gives an opportunity to become a top professional in the field.

Strong written and spoken English is necessary, and other languages are an advantage.

For more information:
Jari Vanhatalo, tel. +358 44 7501116. Contacts from 9 a.m. to 12 noon.

Please send your application with your salary request and curriculum vitae, by email for confidential review to

Open Position – Sourcing Manager

We are looking for reinforcement to join our Steerprop team in Rauma:


As your responsibility, you will be developing our purchasing process. An essential part of the job will be to identify, evaluate and select new suppliers. In your role, you will head up our purchasing team and be responsible for timely and cost-effective sourcing. Your job scope will also include tracking, developing and reporting the key performance indicators for our procurement operations. 

We expect that you have experience from a similar sourcing position. Previous knowledge from heavy industry or any related manufacturing technology industry is an advantage. You are active, independent and motivated to develop your own skills and willing to learn new things. You have a determined approach to your job and good communication skills. You master the basics of IT and have a technical education. You also have a good command of writing and speaking in English. This position requires some traveling.

Please send your application latest by April 9, 2020, with your salary request and curriculum vitae, by email for confidential review to

For more information:
Kai Arvela, tel. +358 40 543 8311. 
18-20/03/2020, 13:30-15:00 pm
25-27/03/2020, 13:30-15:00 pm.

The propulsor as a noise source

On seagoing vessels, propulsor systems cause two types of noise. There’s the noise you hear onboard the ship, called onboard noise. And then there’s the kind you hear underwater, also known as underwater radiated noise (URN).

Although the former has been of concern for some time, the latter is gaining in importance. What’s being done? Well, as you’ll see, we’re designing systems and conducting research to reduce both onboard noise and URN.

A whale of a problem

Ultimately, the requirements for noise reduction hinge on the type of shipping being done. While onboard noise tends to disturb passengers on passenger ships, URN is much more harmful to delicate underwater ecosystems. Take, for example, the Arctic or the Antarctic, sensitive areas where URN might affect seagoing creatures and habitats.

In the areas surrounding the Port of Vancouver, officials implemented reduced harbor fees for ships that met certain URN criteria, due to the sensitivity of the local native whale and mammal populations.

Around the world, fishing vessels are concerned with URN causing evasive behavior of fish, and research vessels often cite this noise as degrading the quality of underwater signal measurements.

Classification societies, such as DNV-GL, have also started implementing noise limits. Currently, not many vessels are URN classified, but that’s expected to change in the near future.

Noise Illustration 1
Figure 1: Example distribution of sound pressure level near a CRP ECO unit.

What causes the noise?

To meet demand for new or modified URN classified vessels, designers and shipyards should give due attention to all major noise sources on board.

On the propulsion side, they should concentrate on mitigating the two primary sources of propulsor noise. That means designing propellers and drive trains to be more silent. Propellers cause noise through water cavitation, and drive trains make noise with mechanical power transmissions and gears.


At Steerprop, we’re addressing both problems. Our CRP solution limits propeller noise by having two separate propellers, each with a lower loading, which helps prevent cavitation and lowers both onboard noise and URN.

We’ve also worked to reduce drive train noise with our special LM unit. Integrated with a permanent magnet (PM) motor, the LM unit removes the upper gear, replacing it with a more silent electric motor.

Noise Illustration 2
Figure 2: Example distribution of sound pressure level on the structure interface of a CRP ECO unit.

Studies for deeper insight

We also continue to seek new ways of understanding and reducing noise through joint research projects. We have been collaborating with Finland-based ATA Gears to study the impact of various geometries and components on noise. Using FEM calculations, we’ve studied noise excitation and noise transmission mechanisms in our Z, L and M units.  

For a RoPax ferry and an expedition cruise vessel, we have made both structure-borne noise and URN measurements. The latter were made together with Luode Oy, which specializes in underwater measurements.

While we’ve made some strides, many issues with onboard noise and URN are still difficult to predict since there aren’t public databases on the issue, especially for URN. For example, navies around the world hold URN data dear since they can use the URN to determine a vessel’s signature and figure out what type of vessel is in the water.

Regardless, we’re intent on conducting ongoing research and doing what we can to improve our solutions. That includes researching absolute noise levels, as well as gathering data and determining methods to help design and engineer quieter and quieter vessels.

We’re proud to be carrying out measurements with reliable partners and doing what we can to address the needs of customers and the environment.

Kari Kyyrö

About the Author:

Kari Kyyrö, Consulting Naval Architect. With 25 years working at a shipyard and 4 years working for Steerprop, Kari has accumulated vast experience in the various facets of designing ship hydrodynamics. One area in particular that interests him is how to reduce the amount of noise that ships produce, creating more comfort and sustainability with shipping.

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In shipping, it’s not easy being green

In a competitive international shipping industry, it’s not easy to balance environmental concerns with business demands.

But the world is changing, and something needs to be done. After all, 97% of all research shows that climate change is caused by humans and is harmful to the earth and everyone on it. And shipowners should also be willing to change their ways. If not, there are new regulations and prohibitive fee structures in place to encourage them to do so.

Sure, there’s a lot of talk in boardrooms about the issue of climate change and what to do about it. But business is business.

When capital is tight, shipowners and financiers tailor investment strategies to address short-term budgetary constraints. Too often, they are not in thinking of the environmental benefits of making a wise large capital investment that will pay out considerable operational savings down the road.

A shipowner, for example, might consider investing in a new ship – or upgrading an existing vessel – with an energy-efficient hybrid or electric propulsion system based on a permanent magnet (PM) machine that not only delivers long-term cost savings but also helps the environment. But these high-end components are often the first to be axed if a company is looking to keep costs in line in the near term.

At Steerprop, we think this needs to change. Therefore, we encourage the industry to take a more long-term view. It might cost more up front to invest in new technologies. However, the future savings from increased efficiency coupled with more eco-friendly operations can quickly lead to a sizeable return on investment. Upgrading to newer technologies means making a difference in the short run, while also future-proofing your vessels for the long term.

At Steerprop, we design each of our propulsor systems with unrivaled reliability, energy efficiency and low maintenance requirements – helping limit overall costs. Plus, you can reach the dock quicker, because azimuth propulsors allow excellent maneuverability.

Moreover, integrating our propulsors with the latest PM machines reduces the system footprint and makes it easier to install them into the vessel. Together, these technologies lower energy consumption and deliver more added value over the vessel’s lifetime. What’s more, each of our propulsor units features a Steerprop Care condition monitoring system. This tool provides predictive maintenance oversight that enables service scheduling at future port stops to help eliminate the need for emergency repairs on the high seas. As a result, we can help maintain service intervals that are significantly longer than any other system supplier on the market.

These are just the latest capabilities of a company that has proven dedication, experience and expertise. Since 2000, we have supplied over 800 propulsors to cruise, arctic, passenger, workboat and offshore vessels, as well as outfitted more than 85 ice-class units and made deliveries to 8 icebreakers. Now, with solutions such as Steerprop propulsors integrated with PM machines, we’ve begun a green revolution in the maritime industry. Our aim is not just to save fuel and improve operational performance – but also to shape the future of the world’s environment.


About the Author:

Mika Koli heads up the Sales and Marketing for Steerprop. Since joining the company in March 2018, his vision has been to drive a lasting change for the world by enabling vessels to operate in an environmentally sustainable and future-proof way.

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Industry expert appointed to drive Steerprop strategic ambition

Steerprop’s Board of Directors has appointed Riku-Pekka Hägg as the new Chief Executive Officer (CEO) of the company. Hägg will begin in his new role at the start of January 2020.

As former Vice President of Ship Design at Wärtsilä, Hägg brings decades of maritime technology know-how, digital and strategic experience to Steerprop. This appointment will help strengthen the company’s strategic ambitions to take advantage of the upcoming changes in the marine industry.

“Steerprop shares my passions and values to ensure efficient and sustainable shipping in the future. Together with Steerprop’s skilled personnel, we have the possibility to make great things to happen for the company, the industry and the environment.” says Hägg.

Hägg is a well-known maritime technology strategist and thought leader internationally. He has been a strong advocate for safe, efficient and sustainable shipping in his role at Wärtsilä as well as in his role as Chairman of the Management Board at the ONE SEA alliance, an organization that is leading the way toward an autonomous maritime ecosystem by 2025.

Hannu Heino, Chairman of Steerprop’s Board of Directors, describes Hägg to be an experienced business leader and strategist with strong experience in numerous leading positions. With his experience and technical background, the company can achieve a stronger position as a solution provider in the fast-changing maritime industry.

Riku-Pekka Hägg_crop

“I’m very much looking forward to being part of one of the leading azimuth propulsion companies in the world. My main focus will be to bring greater value to Steerprop’s partners, suppliers and customers,” adds Hägg.


For more information:

Mrs. Johanna Innola
Marketing Communications Planner
Mobile: +358 44 750 1125

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Shifting focus to ship-scale CFD in the marine industry

With the recent advent of high-end computing power, computational fluid dynamics (CFD) has become an indispensable tool in the marine industry. Beyond predicting performance parameters, a detailed flow pattern study enables designers to better design products to avoid undesirable flow features, such as separation on the housing, which in addition to increased drag can also subject the propeller to significant non-uniform inflow.

Ship-scale CFD is now gaining traction in a much broader way when it comes to propulsion solutions – from the predesign stage to final tailoring of the unit’s propeller blades. These state-of-the-art computational tools have also greatly extended our design capabilities at Steerprop, enabling our designers to offer tailor-made solutions.

Below are just some of the ways that ship-scale CFD is bringing new benefits to vessel designers, shipowners and system integrators.  

Capture of a hub vortex: Identifying energy losses is essential to improving the performance of the propulsor unit.

Choice of propulsors: When shipowners select the right propulsion units for their vessels, the decision is still primarily based on comparative performance using model scale tests.

With a greater shift towards using azimuth propulsors in modern ships, however, unit performance is significantly affected by scale effects. The reliability of traditional empirical methods in scaling the performance of these units, especially ducted ones and podded propulsors, is still a great concern. Therefore, a need is opened up to supplement model scale tests with CFD tools to accurately predict the azimuth propulsor performance.

Shape your housing: An optimized gear housing is essential from the perspective of overall azimuth propulsor unit performance. CFD, coupled with 3D modeling tools, has enabled us to carry out detailed investigations by defining and optimizing the housing in terms of geometry parameters, like housing length, torpedo diameter, strut distance from propellers and more.

A better understanding of their individual and combined effects through interaction on overall propulsor performance has enabled designers at Steerprop to better design our units, even in off-design and steering conditions.

With developed accuracy and confidence in modern computational tools, our focus has nowadays been more on optimizing the housing and thus our units at ship scale, rather than defining the unit’s performance with model tests.

Design your propeller for actual flow conditions: In times when there are conflicting design requirements for minimum-to-no-cavitation, low-noise and high-efficiency propeller units, it becomes more essential for designers to ensure that the inflow conditions are properly captured.

Traditionally, the design of propeller blades considers the nominal wake data obtained from model test and couples it with not-so-reliable empirical extrapolation schemes. Today, computational tools, like BEM-RANS coupling, further improve the design process by making ship-scale effective wake available.

This has greatly improved our ability to predict behind-the-ship cavitation performance and thus avoids overly conservative designs.

A sea of new opportunities

The integration of these tools in our daily design process, with the level of detail in their prediction, is limited only by computing power. Additionally, the growing availability of on-board monitoring data on modern vessels will further extend the reliability and performance of these tools in days to come. At Steerprop, we’re always on the lookout for new ways to put our computational tools to use for improved propulsion power.

About the author:

Mahish Mohan brought his CFD knowledge to Steerprop just over one year ago. He is now driving the company’s and team’s capabilities forward in their use of computational tools for tailor-made customer solutions. After Steerprop brought this advanced capability in-house, the company now has a competitive edge when putting this special expertise into practice.

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Steerprop joins European Tugowners’ Association to enhance information sharing

During summer 2019, Steerprop joined the European Tugowners’ Association (ETA), which represents the interests of the towage sector at the EU level. This new membership aims to strengthen Steerprop’s ability to gain insight on evolving trends in the tug market sector and offers the company an opportunity to share knowledge about the latest propulsion development with other members.  

The European Tugowners’ Association has transformed over the years from a purely London-based association in 1963 to now representing the towage industry at a continental level. The association advocates the tug sector’s interests both in Brussels as well as in other European capitals and helps distribute information about the crucial role of this sector for the EU economies.

According to Tapio Aho, Sales Development Manager for Steerprop, this new membership allows Steerprop to keep up to date with the latest developments in the tug market and to participate in the association’s events.

“We’re also looking forward to meeting the decision-makers in the sector. This is a wonderful opportunity for us to share our knowledge of how the technology for main propulsion is developing and the benefits that Steerprop has to offer this particular workboat sector,” he says.

The ETA mission

The European Tugowner’s Association’s mission statement is: To be the voice of the European towage industry, to foster safety values and protection of the environment as well as to promote the interests and respond to the needs of the members.

Through policy and technical expertise, sharing best practice, and public affairs and communication activities, ETA aims to promote the towage industry interests and its contribution to EU trade. It also plays a significant role in implementing safety and sustainability in maritime activities.

Steerprop’s contribution to tugboats

Specifically for tugs and workboats, where endurance, reliability and agility are essential, Steerprop offers specialized designs and world-class expertise. The company’s ducted propulsors have proven their quality in tugboats all over the world. The latest generation of propulsors raises efficiency and robustness to unprecedented levels. They offer hydrodynamic enhancements for superior bollard pull and high free-running efficiency. With ice conditions or transit, Steeprop’s CRP is the right choice.

For more information:
Tapio Aho, Sales Development Manager, Steerprop Tel. +358 40 727 1203

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Celebrity Flora, the first expedition mega yacht of its kind specifically designed for the Galapagos Islands, started maiden voyage with Steerprop CRP

Shipyard De Hoop in the Netherlands selected Steerprop to deliver two contra-rotating propulsors (CRP) to Celebrity Flora, the brand-new innovative luxury expedition cruise vessel. On May 18, the ship set off on its maiden voyage towards Las Palmas before it crosses the Atlantic. For Steerprop, this marks the first delivery of its high-efficiency CRP technology to a seagoing cruise vessel.

In 2016, Steerprop was contacted by Shipyard De Hoop to give a proposal for a luxury cruise vessel propulsion system that required the highest levels of efficiency along with low noise and vibrations, both inside the vessel and under the water. De Hoop chose Steerprop as one of the contenders based on the good cooperation the two companies have enjoyed since 2001, the year Steerprop was founded.

“We’re really proud and excited to have been involved in this prestigious project,” says Jussi Tarvainen, Sales Manager at Steerprop. “This type of luxury vessel has extremely high demands for efficiency and performance, and we were able to fulfill them.”

“Expedition mega yachts like Celebrity Flora are a growing segment, and our propulsion technology and special expertise are perfect for sensitive environments and ice classes,” he continues.

Built-in efficiency

SP 20 CRP units were selected for the vessel based on their unsurpassed efficiency and ability to operate in strictly regulated marine environments. The dual-end CRP offers exceptional hydrodynamic qualities with its specially engineered underwater body. Noise levels and vibrations are extremely low, which was vital for this particular vessel.

In addition, CRP provides outstanding maneuverability with its advanced azimuth propulsor design and excellent efficiency. The vessel will also be able to take advantage of the high fuel savings and low emissions that the propulsion system provides.

To date, Steerprop has delivered over 800 propulsors operating reliability on a wide range of vessels, including ice-class units.

More about Celebrity Flora

Celebrity Flora began sailing in the Galápagos from Baltra on June 30, 2019. The most energy-efficient ship of its kind in the region, Celebrity Flora was designed specifically to explore the Galapagos. Celebrity’s signature outward-facing design concept gives guests 360-degree views of the islands at virtually every turn. The all-suite luxurious accommodations surround guests with every creature comfort, including service provided by personal attendants. Unique to Celebrity Flora are the first-ever glamping experience at sea in the Galapagos, new dining venues, an open-air stargazing platform, expert-led ecological seminars, and custom-designed Novurania yacht tenders, which create a seamless sea-to-shore experience. Bookings are open at or through a travel advisor, for the ship’s alternating seven-night inner and outer loop itineraries and selection of 10-, 11-, and 16-night packages, which feature either pre- or post-cruise expeditions.

More about Shipyard De Hoop

Shipyard De Hoop was founded in 1889 and has developed into one of the most established yards of the Dutch shipbuilding industry. At Shipyard De Hoop, the focus is on designing, engineering and building custom vessels, both for the inland and seagoing markets. Celebrity Flora was built at De Hoop Lobith, in the eastern Dutch province of Gelderland, one of the shipyard’s two shipbuilding facilities.

For more information, please contact:
Jussi Tarvainen, Sales Manager, Steerprop,
Tel. +358 44 750 1114

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Atlantic Towing aims for best-in-class energy efficiency with Steerprop’s propulsors

Steerprop will deliver two of its hallmark contra-rotating propulsor (CRP) units to Canadian Atlantic Towing Limited’s latest platform supply vessel (PSV), the Atlantic Harrier. The vessel will be designed and built by Havyard Ship Technology in Norway and is scheduled for delivery in April 2020. The new vessel is part of Atlantic Towing’s strategy to offer its customers large cargo capacities with outstanding fuel efficiency and low emissions.

Steerprop was selected thanks to its long relationship with Havyard Ship Technology and numerous successful propulsion projects that they have completed together. Atlantic Towing is a new customer for the shipbuilder.

“This marks another contract between Havyard Ship Technology and Steerprop, and a new ship to service,” says Hannu Jukola, Senior Sales Manager at Steerprop. “Our CRP technology is perfectly suited for this particular type of hull. Additionally, the propulsion system enables Atlantic Towing to reach the high level of energy efficiency that they aim to attain with their new large cargo PSVs.”

“We look forward to having Steerprop on board with us for this exciting project and have, as always, high expectations both for performance and the cooperation,” says Hanne Reite Keyn, Purchasing Manager at Havyard Ship Technology AS.

Steerprop will deliver two SP35 CRP propulsion units with a power of 2,100 kW per unit. The technology has been specifically designed for vessels that need to operate in the harsh Atlantic coastal conditions in the North Atlantic and North Sea. Along with having an Ice Class 1B notation, the new 294-foot-long PSV has a 10,785-square-foot deck area, large cargo tankage and can accommodate up to 54 people. 

Innovative dual-end contra-rotating propeller (CRP)

The Steerprop 35 CPR propulsor system offers outstanding speed and unsurpassed efficiency, thanks to the hydrodynamic qualities of the underwater body design. The dual-end CRP combines the exceptional maneuverability of azimuth propulsors with low-pressure pulses and noise levels.

To date, Steerprop has delivered over 800 propulsor units to vessels throughout the world. The design has been tested and verified in action for decades.

For more information, please contact:
Hannu Jukola, Senior Sales Manager, Steerprop, Tel. +358 40 838 8643

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