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  • MAKE USE OF GLOBAL WINDS

    We are the experts for rotor sails

  • ECO FLETTNER ROTOR WITH TWO END DISKS

    Free extra thrust for your vessel

  • THE LATEST GENERATION OF ROTOR SAILS

    Contact us for more information

Product

THE ECO FLETTNER Rotor WITH TWO END DISKS REPRESENTS THE LATEST GENERATION OF A WIND ASSISTED PROPULSION SYSTEM (WAPS)

It’s a redesign of the Flettner concept which takes advantage of the so-called Magnus effect in the presence of side wind to produce additional thrust forward. The EF rotor in different sizes rotates around a pivot with upper and lower bearings. It has many innovative design features, such as lightweight materials and the ability to rotate at high speeds. The use of two end disks ensures very favourable flow conditions around the rotor.

The rotors acts additively to the propeller and with increasing sailing performance the main engine power is to be reduced efficiently. It is full functional and independent propulsion system. The crew can choose to utilize the extra thrust generated by the rotor to reduce engine power and fuel consumption, or to increase the ship’s speed.

annika braren ship with rotor at harbour

ECO FLETTNER ROTOR
18 M HEIGHT & 3 M DIAMETER

Technical Specifications

Sail surface (m2) 54
Diameter of upper and lower end disks [m] 6
Material Rotor: GFP
Mast: Steel
Rotor Speed (rpm) Max. 280
Lightning conductor / Ice prevention yes / yes
Support structure
Tower Steel
Foundation height (typical) [m] Hight between main deck and forecastle deck + 2300 mm
over forecastle deck
= approx. 5000 mm
⌀= approx. 2300 mm
Weight incl. typical foundation [tons] Approx. 34 t / ship specific
Drive Electric geared motor
Electric power (kW) 75
Variable speed drive yes
Brake resistor / Mechanical lock Electric Brake / yes
Control system software yes
Hardware yes
Condition Monitoring System yes
Thrust Measurement System yes
ATEX compliant design on demand
Ambient conditions
ATEX compliant design on demand
Operational temperature 40° C ambient temperature in the tower
Operational wind speed range TADC (DNV GL) 30 m/s
Survival wind speed TADC (DNV GL) 50 m/s
Thrust Approx. 78 kN / BN9 (22,5 m/s)
Lead time (month) 12
Life Time (h) Approx. 50.000 h in full load condition

ECO FLETTNER ROTOR
24 m height & 4 m diameter

Technical Specifications

Sail surface (m2) 96
Diameter of upper and lower end disks [m] 8
Material Rotor: GFP
Mast: Steel
Rotor Speed (rpm) Max. 210
Lightning conductor / Ice prevention yes / yes
Support structure
Tower Steel
Foundation height (typical) [m] Hight between main deck and forecastle deck + 2300 mm
over forecastle deck
= approx. 5000 mm
⌀= approx. 3300 mm
Weight incl. typical foundation [tons] Approx. 43 t / ship specific
Drive Electric geared motor
Electric power (kW) 135
Variable speed drive yes
Brake resistor / Mechanical lock Electric Brake / yes
Control system software yes
Hardware yes
Condition Monitoring System yes
Thrust Measurement System yes
ATEX compliant design on demand
Ambient conditions
ATEX compliant design on demand
Operational temperature 40° C ambient temperature in the tower
Operational wind speed range TADC (DNV GL) 30 m/s
Survival wind speed TADC (DNV GL) 50 m/s
Thrust Approx. 139 kN / BN9 (22,5 m/s)
Lead time (month) 12
Life Time (h) Approx. 50.000 h in full load condition
AT THE PLANNING STAGE

ECO FLETTNER ROTOR
31 m height & 5 m diameter

Technical Specifications

Sail surface (m2) 155
Diameter of upper and lower end disks [m] 10
Material Rotor: GFP
Mast: Steel
Rotor Speed (rpm) Max. 165
Lightning conductor / Ice prevention yes / yes
Support structure
Tower Steel
Foundation height (typical) [m] Hight between main deck and forecastle deck + 2300 mm
over forecastle deck
= approx. 5000 mm
⌀= approx. 4300 mm
Weight incl. typical foundation [tons] Approx. 53 t / ship specific
Drive Electric geared motor
Electric power (kW) 230
Variable speed drive yes
Brake resistor / Mechanical lock Electric Brake / yes
Control system software yes
Hardware yes
Condition Monitoring System yes
Thrust Measurement System yes
ATEX compliant design on demand
Ambient conditions
ATEX compliant design on demand
Operational temperature 40° C ambient temperature in the tower
Operational wind speed range TADC (DNV GL) 30 m/s
Survival wind speed TADC (DNV GL) 50 m/s
Thrust Approx. 247 kN / BN9 (22,5 m/s)
Lead time (month) 12
Life Time (h) Approx. 50.000 h in full load condition
AT THE PLANNING STAGE

Since 01/01/2021 NaMKü-

This German funding is appropriate for installation of wind assisted ship propulsion systems (WASP) for retrofits and new buildings:

Förderrichtlinie „Nachhaltige Modernisierung von Küstenschiffen“

Funding guideline "Sustainable modernization of coastal ships"


Download:
For more information please click here: NaMKü

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Advantages
OF THE ECO FLETTNER rotor SAILING SYSTEM:

NO ADDITIONAL CREW REQUIRED ON BOARD

No set, trim or reef of sails

NO SAFETY RISKS IN SEVERE WEATHER

heavy weather sailing system

NO IMPACT IN THE CARGO OPERATIONS

An easy-to-use operating system is combined with intelligent voyage optimization programs

Fully automated and intelligent sailing system

Less CO2, SOx, NOx and other emissions

IMO – Improved energy Efficiency of ships (EEDI+EEXI)

Charterer/Shipper benefit from improved carbon footprint on supply chain

Higher charter rate achievable due to fuel savings

Efficiency

The ECO FLETTNER technology achieves with a new generation of rotor sailing systems for the break-through as a building block for low-emission shipping

The main question about modern rotor sailing systems is about the performance potential and fuel savings. For the prediction of the rotor’s propulsion power and associated fuel savings, numerous model tests and simulations were performed using the wind tunnel of TU Hamburg-Harburg and numerical CFD methods at the Center for Modelling and Simulation at the Emden/Leer University of Applied Sciences. Transparent performance data is required to enable an economic prognosis for the use of Flettner rotors on ships.


The expected performance figures are based on the test trails on MV Fehn Pollux (2018).

In medium wind areas

  • (e.g. Mediterranean Sea)
  • 2 kW main engine equivalent power per 1 qm of rotor surface
  • e.g. MV Fehn Pollux 108 kW
  • about 16.6 % at 650 kW (MCR) Maximum Continuous Rating

In good wind areas

  • (e.g. North Sea and Baltic Sea)
  • performance expectations
    2,5 kW main engine equivalent power per 1 qm of rotor surface
  • e.g. MV Fehn Pollux 135 kW
  • about 20.8 % at 650 kW (MCR)

In very good wind areas

  • (e.g. Atlantic Ocean)
  • performance expectations
    > 3 kW main engine equivalent power per 1 qm of rotor surface
  • e.g. MV Fehn Pollux > 162 kW
  • about > 24.9 % at 650 kW MCR

The savings potential depends on the wind conditions along the route and other factors. Precise predictions are made by route simulations for a specific ship.

THE ECO FLETTNER ROTOR

In medium wind conditions the rotor sailing system produces 2 kW propulsion power per square meter. The amount of achievable savings depends on where the ship is in operation and the projected area.

For example: The EF18 rotor has a sail area (H × D) of 54 m2. Multiplied with 2 kW per square meter the EF18 produces 108 kW main engine equivalent power in annual average in a medium wind area and 162 kW (>3 kW) in very good wind areas. With this formula ship owners can calculate size and quantity of rotor sails, which are necessary to get a specific amount of fuel and emission savings.

POWER OF ROTOR AND MAIN ENGINE IN RELATION TO SHIPS SPEED
(MV FEHN POLLUX)

Speed Power Fehn Pollux

Data collection and data evaluation by the University of Applied Sciences Emden/Leer, Germany, Prof. Capt. Michael Vahs, published in Schiff & Hafen Heft 2/2019, Germany

The rotor was used to increase the ship’s speed and compared with the equivalent power required for the main engine to achieve the same speed increase.

In normal charter service of MV Fehn Pollux, the main engine power is limited to about 650 kW (Eco-Speed). On MV Fehn Pollux average fuel savings in the range of 15–20% can be expected depending on the required ship speed and the sailing area.

Performance figures for the EF18 rotor:

  • 1. Rotor thrust approximately 80 kN max. depending on wind conditions
  • 2. Rotor propulsion power ap proximately 700 kW equivalent to the main engine
  • 3. A temporary 100% sailing mode is possible under optimal wind conditions
  • 4. In automatic modus it will be possible to save more than 130 t of Marine Gas Oil per year, this means a reduction of about 400 t of CO2, 3.3 t less SOX, 4.6 t less NOX and 0.4 t less particle emissions in annual average

ECO FLETTNER rotor sailing systems will get contribution to the energy efficiency requirements (EEDI + EEXI) for new buildings and existing ships.

Integration

  • For flexible implementation in the hull

    For flexible implementation
    in the hull

  • thumbnail

    4,500 tdw MPC (Mini Bulker)
    with 18 m Rotor

  • thumbnail

    11,000 tdw MPC with 24 m Rotor

training

A thrust measuring system, a rotor control system and also a crew training system are genuine innovations, which have been designed and developed by partners of the ECO FLETTNER project. A three-days crew training with the main focus on manoeuvring a rotor vessel has been implemented at the ship handling simulator of the company Nautitec in Leer. On request we offer a three-days training course.

Crew training in the ship handling simulator at the University Emden/Leer

Crew training

Crew training in the ship handling simulator at the University Emden/Leer

in the ship handling simulator

Crew training in the ship handling simulator at the University Emden/Leer

at the University Emden/Leer

Projects

Project MV Fehn Pollux

MV Fehn Pollux in the ship yard SEC in Leer/Germany after rebuilding June 2018 with ECO FLETTNER.


  • Data collection and data evaluation by the University of Applied Sciences Emden / Leer, Germany, Prof. Capt. Michael Vahs, published in Schiff & Hafen Heft 2/2019, Germany.
  • Building site:Emden, Germany
  • Completion:2018
  • Link: NEW KATALOG 2021

Project MV ANNIKA BRAREN

During the docking of the MS Annika Braren, part of the Rörd Braren fleet, at the SEC shipyard in Leer/Germany, an ECO FLETTNER rotor sailing system was successfully installed in 12 days of construction on the one year old vessel.


Eco Flettner trading partners

ECO FLETTNER PARTNERS

Eco Flettner in the Press - VIDEO

Wind Hybrid Coaster - ECO FLETTNER
Professor Michael Vahs spricht über den Flettner-Rotor

ECO FLETTNER in the Press

Green Ship Technology

FLETTNER Rotor reduces fuel costs. German edition, (Schiff & Hafen | Februar 2019)

Download PDF: (1,2 MB)

MariTIMES

News from the Interreg Project on Maritime Technologies and Innovations, model region Germany/Niederlands. Dutch edition, 11/2014.

Download PDF: (6,2 MB)

THB

The multipurpose freighter "Fehn Pollux" now runs with a Flettner rotor. Scientists observe the performance. German edition, (THB 02.07.2018)

Download PDF: (160 KB)

Brochure Wind Hybrid Coaster

Lightweight high-performance sail rotors for coastal shipping. German edition.

Download PDF: (4,4 MB)

ECO FLETTNER

Ship & Offshore Greentech FehnPollux 2019

Download PDF: (5,5 MB)

VEUS-Shipping

CLICK HERE!

Contact

ECO FLETTNER GmbH

Address:
Mühlenweg 5
D-26789 Leer/Germany

Phone: +49 (0) 491 9255523
Mobile: +49 (0) 491 9255526

Email: info@ecoflettner.de