For Designers

Norsepower project services cover all phases from the case study preparation to the Rotor Sail Solution delivery. Each project is planned according to our client’s needs and preferences.

If you are a naval architect, an engineer who is responsible for the design, construction, and/or repair of ships, or are looking for more detailed technical information on the Rotor Sail Technology then this section is for you.

We start our process with familiarization of your fleet, the sailing schedule, time at sea ratio, geographical operation areas in terms of location, wind direction and speed.

Based on our knowledge and the wind data, we can provide our recommendations for the potential vessel and route selection.


We will carry out a case study for the selected vessel with Rotor Sail(s) installed and an estimation for the fuel savings, emission reduction, and the payback time.

The Norsepower Rotor Sail Solution is the first commercially available auxiliary wind propulsion solution with a proven track record of successful operation since 2014. The key advantages of the Norsepower Rotor Sail Solution are:

  • Fuel costs can be reduced typically by 5% to 20% without lowering the operating speed of the vessel

  • Rotor Sail operation is highly automated, and it can be controlled by the crew from the bridge

  • The solution has been tested in co-operation with leading classification societies to ensure that it is robust, durable and safe to use

  • Rotor sails can be installed in new vessels or they can be refitted to an existing ship

At the bottom of this page you will find our general brochure and an inquiry information sheet, which displays the information which we need in order to provide you with a case study

Rotor Sail requirements & typical delivery

Norsepower offers three Rotor Sail models with rotor heights of 18, 24, or 30 meters and diameters of 3, 4, and 5 meters respectively. The scope of supply of the Norsepower Rotor Sail Solution typically includes delivery and installation of the Rotor Sails, as well as a maintenance agreement for the remote service support. The manufacturing and installation of the Rotor Sail foundations can be included in Norsepower's delivery or it can be provided by the customer based on Norsepower's typical design.

One of the key points to consider when installing Rotor Sails is to ensure enough open deck area around the Rotor Sails. To maximize the efficiency of the Rotor Sails and gained savings, the Rotor Sails should be fully exposed to the wind. Naturally, the locations should be such that Rotor Sails do not interfere with the cargo handling or any other ship operations.

The Rotor Sails should be located in a way that ensures a minimum distance equalling the height of the Rotor Sail between adjacent Rotor Sails and nearby deck structures.


This ensures that Rotor Sails do not shadow each other even when one is in the downstream from another with respect to the apparent wind.

Briefly, the optimal number, size, and locations of Norsepower Rotor Sails are based on the following vessel-specific factors:

  • Available deck space providing sufficient clearance from structures obstructing wind flow to the Rotor Sail

  • Aerodynamic properties of the vessel i.e. location of superstructures, cranes, etc. and potential interference between the rotors

  • Steel structures on and below the deck for supporting and installation of the Rotor Sail foundations

  • Issues such as vessel stability, cargo operations, visibility from bridge, radar and navigation light requirements are to be checked for each case

  • Safety requirements are strictly followed to ensure safe operations and working environment


Installation of Rotor Sails

Foundations are used to mount Rotor Sails to the ship´s deck. The foundation transfers the loads produced by a Rotor Sail to the ship´s hull. Manufacturing of the foundation and the actual installation onboard is under the shipowner’s/shipyard’s responsibility. Technical specification for the typical foundation is provided by Norsepower.

Installation of the foundation is done during a normal dry-docking. Steel structure modifications and installation can be done in 7-14 days. If necessary, a part of the works can also be conducted onboard during sailing.

Automation system components (sensors, control, and monitoring panels) as well as the power and automation system cabling, are most convenient to install while the ship is at the maintenance dock. If the maintenance docking period is short, a part of this work can also be done while the ship is in operation.

The installation of the Rotor Sail is a rather fast operation. It can usually be done during a normal port call. Typical installation time is 6-12h per Rotor Sail. In the installation phase, the Rotor Sail is lifted by crane to the foundation, all mechanical and cabling connections are well secured.

Let´s keep in touch if you need more detailed information or you would like us to prepare the case study!

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Tel. +358 40 671 4977 | Tammasaarenlaituri 3, FI-00180 Helsinki |

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