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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 with two end disks of a high - speed - drive light weight construction represents the latest generation of a Wind Assisted Propulsion System (WAPS)

ECO FLETTNER

ECO FLETTNER ROTOR
18 M HEIGH & 3 M DIAMETER

Technical Specifications

Cylinder height x diameter [m]: 18 x 3
Diameter of upper and lower end disks [m]: 6
Support structure: conical steel pipe
Rotor material: glass-fibre reinforced plastic (GRP)
Electric drive: E-engine with gear, max. power up to 75 kW
Max. rpm: 265 1/min
Sail surface: 54 qm
Weight incl. foundation: 30 tons
Rotor thrust: max. 80 kN
Eco Flettner Monitoring System: yes

ECO FLETTNER ROTOR
24 m high & 4 m diameter

Technical Specifications

AT THE PLANNING STAGE
Cylinder height x diameter [m]: 24 x 4
Diameter of upper and lower end disks [m]: 8
Support structure: conical steel pipe
Rotor material: glass-fibre reinforced plastic (GRP)
Electric drive: E-engine with gear, max. power up to 100 kW
Max. rpm: 250 1/min
Sail surface: 96 qm
Eco Flettner Monitoring System: yes
   

ECO FLETTNER ROTOR
33 m high & 5,5 m diameter

Technical Specifications

AT THE PLANNING STAGE
Cylinder height x diameter [m]: 33 x 5,5
Diameter of upper and lower end disks [m]: 11
Support structure: conical steel pipe
Rotor material: glass-fibre reinforced plastic (GRP)
Electric drive: E-engine with gear, max. power up to 150 kW
Max. rpm: 200 1/min
Sail surface: 181,5 qm
Eco Flettner Monitoring System: yes
   

Advantages
of the sailing system Eco Flettner

NO ADDITIONAL CREW REQUIRED ON BOARD

No set, trim or reef of sails

NO SAFETY RISKS IN SEVERE WEATHER

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 – Low carbon shipping and air pollution control

Efficiency

THE ECO FLETTNER REPRESENTS AN INNOVATIVE DEVELOPMENT OF ROTOR TECHNOLOGY

All performance data exceeds the calculations and measurements of the wind tunnel trials, which made by University of Applied Sciences Emden/Leer:
at wind forces of abt. 4-5 bft: +20% more effective and at wind forces of abt. 7-8 bft: +40% more effective.

The expected performance figures are based on the test drives of 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

The test runs in the "MEDIUM WIND AREAS“ carried out on MV Fehn Pollux shows the signifikant savings (S&H, Capt. Prof. Michael Vahs, University of Applied Sciences Emden/Leer).

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)

The savings mentioned in charters "GOOD WIND AREAS“ and "VERY GOOD WIND AREAS“ represent calculated values only and therefore require further ship specific Route Simulation based upon precise weather Data.

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 ECO FLETTNER

has a projected area of 54 m2. Multiplied by 2 kW, the ship saves an annual average of 108 kW at sea beyond its main engine output, equivalent to a 16.6% saving in energy and emissions for the ship’s 650 kW main engine (eco speed). The amount of achievable savings depends on the vessel operational area. Based on this formula, ship owners can easily calculate the best size and quantity of rotor sails, which is required on board to achieve a specific amount of energy savings.

To make comparisons the crew took measurements with the rotor sail switched on and off in identical sea and wind conditions. For example the Eco Flettner produced a thrust of 70 kN and about 700 kW main engine equivalent power output at wind force 7 from abeam (true wind angle 90°), which amounts to roughly 2/3 of MV Fehn Pollux main engine output of 930 kW and more than in normal charter service speed (Eco speed, main engine with 650 kW).

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

Power of rotor and main engine in relation to ships speed (MV Fehn Pollux)

A temporary „100% sailing mode“ will be possible under optimal wind conditions. The crew of MV Fehn Pollux and also an Eco Flettner technician gathered detailed measurements during extensive series of tests, where the rotor sail was switched on and off serveral times.

At a wind force of about 7 bft with 90° wind angle the ECO FLETTNER is producing a sail thrust of about 70 kN up to over 700 kW. This means an amount of 67% power savings of vessels main engine output (regular: 930 kW).

Savings of more then a half ton fuel (MGO) per day can be calculated seriously for MV Fehn Pollux. In automatic modus it will be possible to save more than 130 t of Marine Gas Oil per year, including 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.

If technical steps are taken by the shipping company to reduce fuel consumption with the ECO FLETTNER, it would be directly reflected in the Energy Efficiency Design Index.

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
  • Download data as PDF:

Eco Flettner trading partners

Eco Flettner Shareholders

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: (1,6 MB)

Brochure Wind Hybrid Coaster

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

Download PDF: (4,4 MB)

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