Rotor ship

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Rotor ship E-Ship 1 Cargo E-Ship 1, Emder Hafen, CN-03.jpg
Rotor ship E-Ship 1

A rotor ship is a type of ship designed to use the Magnus effect for propulsion. The ship is propelled, at least in part, by large powered vertical rotors, sometimes known as rotor sails. German engineer Anton Flettner was the first to build a ship that attempted to tap this force for propulsion. "The idea worked, but the propulsion force generated was less than the motor would have generated if it had been connected to a standard marine propeller." [1]

Contents

Ships using his type of rotor are sometimes known as Flettner ships. [2]

The Magnus effect is a force acting on a spinning body in a moving airstream, which produces a force perpendicular to both the direction of the airstream and the axis of the rotor.

Principles of operation

The Magnus effect, depicted with a backspinning cylinder in an airstream. The arrow represents the resulting sideways force that can be used to help propel a ship. The curly flow lines represent a turbulent wake. The airflow is deflected in the direction of spin. Sketch of Magnus effect with streamlines and turbulent wake.svg
The Magnus effect, depicted with a backspinning cylinder in an airstream. The arrow represents the resulting sideways force that can be used to help propel a ship. The curly flow lines represent a turbulent wake. The airflow is deflected in the direction of spin.

A rotor or Flettner ship is designed to use the Magnus effect for propulsion. [3] The Magnus Effect is caused by a spinning body in a moving airstream, or a moving body which is spinning (such as a ball), which pulls the air round to one side of the object, using the skin friction, creating a difference in air pressure from one side to the other. This causes a sideways force on the object making the spinning body move towards the low pressure side where there is least resistance. On a ship, this sideways force is resisted by the hull, and a component of this force can be used to propel the ship forward, provided that the ship's direction is generally within the low pressure zone. A Magnus rotor used to propel a ship is called a rotor sail and is mounted with its axis vertical. When the wind blows from the side, the Magnus effect creates a forward thrust. The most common form of rotor sail is the Flettner rotor. [4] [ failed verification ] The wind does not power the rotor, which is rotated by its own power source.

Due to the arrangement of forces, a rotor ship is able to sail closer to the wind than a conventional sailing ship. Other advantages include the ease of control from sheltered navigation stations and the lack of furling requirements in heavy weather. [4]

If the ship changes tack so that the wind comes from the other side, the direction of rotation must be reversed; the ship would otherwise be propelled backwards. [4]

Sailing ships, including rotor ships, often also have a small conventional propeller to provide ease of manoeuvrability and forward propulsion at slow speeds and when the wind is not blowing or the rotor is stopped. In a hybrid rotor ship the propeller is the primary source of propulsion, while the rotor serves to offload it and thus increase overall fuel economy. [4] Rotor sails have been reported to generate 5-20% fuel savings. [5]

History

The rotor ship Buckau Buckau Flettner Rotor Ship LOC 37764u.jpg
The rotor ship Buckau
The rotor ship "Barbara" in Barcelona Vaixell de rotor Barbara.jpg
The rotor ship "Barbara" in Barcelona

Pioneers

The German engineer Anton Flettner was the first to build a ship which attempted to use the Magnus effect for propulsion. [6] [7]

The Buckau

Assisted by Albert Betz, Jakob Ackeret, and Ludwig Prandtl, Flettner constructed an experimental rotor vessel; October 1924 the Germaniawerft finished construction of a large two-rotor ship named Buckau. [8] The vessel was a refitted schooner which carried two cylinders (or rotors) approximately 15 metres (50 ft) high, and 3 metres (10 ft) in diameter, driven by an electric propulsion system of 50 hp (37 kW) power.[ citation needed ]

The Buckau sailed from Danzig to Scotland across the North Sea in February 1925. [9] The ship could tack (sail into the wind) at 20–30 degrees, [8] hence the rotors did not give cause for concern in stormy weather.[ citation needed ] The ship was renamed Baden Baden after the German spa town and on 31 March 1926 was sailed to New York via South America, arriving in New York Harbor on 9 May. [10]

Some sources claim that the ship had proved inefficient on these voyages, that the power consumed by spinning 15-metre tall drums was disproportionate to the propulsive effect when compared with conventional propellers. [11]

That view stands in contrast to others that claim "Due to the impressive performance, the Buckau was put into service to carry bulk cargo across the North Atlantic and the Baltic sea (Seufert & Seufert, 1983). On 31 March 1926, the Buckau, now renamed Baden-Baden sailed to New York via South America, the 6,200 nautical mile voyage across the Atlantic used only 12 tons of fuel oil, compared with 45 tons for a motor ship of the same size without rotors (Nuttall & John, 2016), arriving in New York harbor on 9 May (History of Flettner Rotor, n.d.)." [12]

The latter assessment seems to be more accurate, as the outcome of the Buckau experiment, resulted in the development of the next rotor ship, the Barbara.

The Barbara

In 1926, a larger ship with three rotors, the Barbara was built by the shipyard A.G. Weser in Bremen. [13] It proved to perform reliably "as a normal freighter in the Mediterranean between 1926 and 1929. By 1928, Flettner had secured orders for six new ships of the Barbara class. However ... there was a global economic crash causing a decrease in consumer buying confidence. In addition to this, Marine Diesel Oil (MDO) and the related engine technology required to use it became readily and cheaply available (Nuttall & John, 2016). Fuel prices at that point meant that any savings achieved by the rotor were too small for shipping companies to consider the investment due to the lengthy payback period." [12]

Modern vessels

Flensburg catamaran at the Kiel Week 2007 Uni-Kat Kiel2007.jpg
Flensburg catamaran at the Kiel Week 2007
Maersk Pelican's are the largest Flettner rotors in the world, as of 2019 Norsepower rotor sails modern version of flettner rotor.jpg
Maersk Pelican's are the largest Flettner rotors in the world, as of 2019

Interest in rotor sails revived in the 1980s, as a way of increasing the fuel efficiency of a conventionally powered ship. It has been estimated that as many as 20,000 vessels could benefit from this technology. [14]

Enercon launched the hybrid rotor ship E-Ship 1 on 2 August 2008. From 2010, it has been used to transport the company's turbine products and other equipment. [15] [16] Enercon claim "operational fuel savings of up to 25% compared to same-sized conventional freight vessels." [17]

The University of Flensburg is developing the Flensburg catamaran or Uni-Cat Flensburg, a rotor-driven catamaran. [18]

In 2007, Stephen H. Salter and John Latham proposed the building of 1,500 robotic rotor ships to mitigate global warming. The ships would spray seawater into the air to enhance cloud reflectivity. [19] [20] A prototype rotor ship was tested on Discovery Project Earth. The rotors were made of carbon fibre and were attached to a retrofitted trimaran and propelled the vessel stably through the water at a speed of six knots.[ citation needed ]

In 2009, Wärtsilä proposed a cruiseferry that would use Flettner rotors as a means of reducing fuel consumption. The Finnish ferry operator Viking Line adopted the idea, with MS Viking Grace built in 2011–2012, initially without rotors. [21] A rotor system was retrofitted in 2018. [22]

In 2014 and 2015, Norsepower installed twin rotor sails on Finnish shipping company Bore's RoRo vessel M/V Estraden. [23] [24] [25] In May 2018, the 1996 built cargo ship Fehn Pollux of the German-based Fehn Shipmanagement (Leer) was fitted with an 18-metre long Flettner rotor of the EcoFlettner type at the front. [26]

In 2018, Norsepower deployed rotor sails with the world's biggest shipping company, Maersk. The Maersk Pelican, an LR2 class tanker, has been fitted with two Norsepower Rotor Sails. [27] [28]

The MV Afros (IMO 9746803) bulk carrier has operated four movable rotors over a year with positive results. [29] [30] [31] [32]

In 2021, Norsepower installed five tilting rotor sails onto a Vale-operated iron ore carrier; the tilting design intended to allow maneuvering below bridges. [5] [33]

Scandlines operates two hybrid ferries with rotorsail, M/F Copenhagen and M/F Berlin. [34]

In October 2023 Airbus announced that it had commissioned six ships with Flettner rotors for entry into service in 2026 to transport aircraft sections to its US assembly line. [35]

See also

Related Research Articles

<span class="mw-page-title-main">Propulsion</span> Means of creating force leading to movement

Propulsion is the generation of force by any combination of pushing or pulling to modify the translational motion of an object, which is typically a rigid body but may also concern a fluid. The term is derived from two Latin words: pro, meaning before or forward; and pellere, meaning to drive. A propulsion system consists of a source of mechanical power, and a propulsor.

<span class="mw-page-title-main">Age of Sail</span> Historical era when sailing ships dominated global trade and warfare

The Age of Sail is a period in European history that lasted at the latest from the mid-16th to the mid-19th centuries, in which the dominance of sailing ships in global trade and warfare culminated, particularly marked by the introduction of naval artillery, and ultimately reached its highest extent at the advent of steam power. Enabled by the advances of the related Age of Navigation, it is identified as a distinctive element of the early modern period and the Age of Discovery.

<span class="mw-page-title-main">Savonius wind turbine</span> Type of wind turbine that spins along its vertical axis

Savonius wind turbines are a type of vertical-axis wind turbine (VAWT), used for converting the force of the wind into torque on a rotating shaft. The turbine consists of a number of aerofoils, usually—but not always—vertically mounted on a rotating shaft or framework, either ground stationed or tethered in airborne systems.

<span class="mw-page-title-main">Anton Flettner</span> German aviation engineer and inventor (1885–1961)

Anton Flettner was a German aviation engineer and inventor. Born in Eddersheim, Flettner made important contributions to airplane, helicopter, vessel, and automobile designs.

<span class="mw-page-title-main">Gyrodyne</span> Type of VTOL aircraft

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<span class="mw-page-title-main">Marine propulsion</span> Systems for generating thrust for ships and boats on water

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<span class="mw-page-title-main">Flettner rotor</span> Cylindrical, rotating aerodynamic surface

A Flettner rotor is a smooth cylinder with disc end plates which is spun along its long axis and, as air passes at right angles across it, the Magnus effect causes an aerodynamic force to be generated in the direction perpendicular to both the long axis and the direction of airflow. The rotor sail is named after the German aviation engineer and inventor Anton Flettner, who started developing the rotor sail in the 1920s.

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<span class="mw-page-title-main">Flettner airplane</span> Aircraft using a Flettner rotor

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<i>E-Ship 1</i>

E-Ship 1 is a roll-on/lift-off (RoLo) cargo ship that made its first voyage with cargo in August 2010. The ship is owned by the third-largest wind turbine manufacturer, Germany's Enercon GmbH. It is used to transport wind turbine components. The E-Ship 1 is a Flettner ship: four large rotorsails that rise from its deck are rotated via a mechanical linkage to the ship's propellers. The sails, or Flettner rotors, aid the ship's propulsion by means of the Magnus effect – the perpendicular force that is exerted on a spinning body moving through a fluid stream.

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<span class="mw-page-title-main">Sigurd Johannes Savonius</span>

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The Plymouth A-A-2004 is a rotor aircraft inspired by the Flettner rotor, a type of rotor that uses the Magnus effect to produce lift. Built specifically for Zaparka in 1930 by three anonymous American inventors, this aircraft showcased the innovative use of the Magnus Effect in aviation, leading to successful flights over Long Island Sound.

References

  1. ↑ NASA web page
  2. ↑ Borg, John (1985). "The Magnus Effect - an overview of its past and future practical applications" (PDF). Defense Technical Information Center (.mil). Prepared by the Borg/Luther Group for Naval Sea Systems Command Department of the Navy. Retrieved 11 September 2024.
  3. ↑ Hubert Chanson (30 August 2013). Applied Hydrodynamics: An Introduction. CRC Press. pp. 100–. ISBN   978-1-315-86304-7.
  4. 1 2 3 4 Gilmore, C.P. (1984). "Spin Sail: Harnesses Mysterious Magnus Effect for Ship Propulsion," Popular Science (January), pp. 70-73, see , accessed 13 October 2015.
  5. 1 2 "Sea Cargo Ship To Be World's First Vessel With Tilting Rotor Sails Arrives In Rotterdam". www.marineinsight.com. 13 January 2021. Retrieved 2021-01-25.
  6. ↑ Anon.; "America's First Rotor Boat", Popular Science Monthly, September 1925, page 27.
  7. ↑ G. A. Tokaty (20 February 2013). A History and Philosophy of Fluid Mechanics. Courier Corporation. pp. 150–. ISBN   978-0-486-15265-3.
  8. 1 2 Seufert, Wolf & Seufert, Ulrich; "Critics in a spin over Flettner's Ships", New Scientist, 10 March 1983, pp. 656-659.
  9. ↑ G. A. Tokaty (1994). A History and Philosophy of Fluid Mechanics. Courier Corporation. pp. 152–. ISBN   978-0-486-68103-0.
  10. ↑ United States Naval Institute (1970). Proceedings.
  11. ↑ Ray, Keith (February 2016). The Strangest Aircraft of All Time. Stroud, Gloucester GL5 2QG: The History Press. p. 48. ISBN   9780750960977.{{cite book}}: CS1 maint: location (link)
  12. 1 2 "History of Flettner Rotors".
  13. ↑ Fred M Walker (5 May 2010). Ships and Shipbuilders: Pioneers of Design and Construction. Seaforth Publishing. pp. 220–. ISBN   978-1-84832-072-7.
  14. ↑ Smith, Oliver. "Norsepower: Why European Ships Are Switching Back To Sails". Forbes. Retrieved 2024-10-11.
  15. ↑ Bahman Zohuri (3 September 2016). Nuclear Energy for Hydrogen Generation through Intermediate Heat Exchangers: A Renewable Source of Energy. Springer. pp. 23–. ISBN   978-3-319-29838-2.
  16. ↑ Kennedy, John (2010). "Discovery: State-of-the-art cargo ship to dock with haul of wind turbines". Silicon Republic (Online, August, 10). Retrieved 12 October 2015.
  17. ↑ Anon. (2012). "PM E-Ship1 Ergebnisse DBU" (PDF). Enercon.de. Archived from the original (PDF) on June 7, 2014. Retrieved 2015-10-12.
  18. ↑ Anon. (2015). "Flettner rotor". Thiiink Holding. Retrieved 12 October 2015.
  19. ↑ Latham, John (2007). "Futuristic fleet of 'cloudseeders' (15 February)". BBC. Archived from the original on 2012-08-25. Retrieved 2012-07-25.
  20. ↑ Salter, Stephen; Sortino, Graham; Latham, John (2008). "Sea-going hardware for the cloud albedo method of reversing global warming". Phil. Trans. R. Soc. A . 366 (1882, 13 November): 3989–4006. Bibcode:2008RSPTA.366.3989S. doi: 10.1098/rsta.2008.0136 . PMID   18757273 . Retrieved 2009-07-27.
  21. ↑ Reinikainen, Kari (2009). "Wind and lng [liquified natural gas] power Wartsila's cruise ferry design". Cruise Business Online (22 June). Archived from the original on 2011-07-08. Retrieved 2010-01-19.
  22. ↑ Bryce, Emma (29 May 2018). "Cheap oil killed sailing ships. Now they're back and totally tubular". Wired UK . Retrieved 29 May 2018.
  23. ↑ "ESTRADEN with Flettner rotor is underway". 10 December 2014.
  24. ↑ "State of technology" (PDF). 2022-05-10.
  25. ↑ "Norsepower". www.norsepower.com. Retrieved 2016-11-25.
  26. ↑ With Flettner's wind power. In: Hansa International Maritime Journal, 9/2018, Hamburg 2018, p. 58/59
  27. ↑ "Rotor Sails Fitted on board Maersk's Tanker in a World's 1st". Aug 30, 2018.
  28. ↑ "Norsepower Rotor Sails Confirmed Savings Of 8.2% Fuel And Associated Co2 In Maersk Pelican Project". Oct 24, 2019.
  29. ↑ Shipping, Green (13 March 2019). "Blue Planet Shipping receives GREEN4SEA Dry Bulk Operator Award". SAFETY4SEA. Retrieved 6 April 2019.
  30. ↑ "Video: ANEMOI Flettner Rotor System – MV Afros Sailing". YouTube . 4 June 2018. Archived from the original on 2021-12-21.
  31. ↑ "Video: ANEMOI moving Flettner Rotor System – MV Afros Berthing". YouTube . 26 November 2018. Archived from the original on 2021-12-21.
  32. ↑ Almendral, Aurora (2021-06-24). "Can Massive Cargo Ships Use Wind to Go Green?". The New York Times. ISSN   0362-4331 . Retrieved 2021-06-29.
  33. ↑ "Norsepower: 5 tiltable rotor sails installed on Vale-chartered ore carrier". Offshore Energy. 2021-05-14. Retrieved 2021-06-09.
  34. ↑ "M/S Berlin gets a new rotor sail: Ingeniøren observes the process". ING. 2022-05-30. Retrieved 2022-09-14.
  35. ↑ "Airbus renewing ocean transport vessel fleet to assist A320neo ramp-up demand". 2023-10-25. Retrieved 2023-10-25.
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