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The Concept of “Green Ship”: New Developments and Technologies
Published in Adam Weintrit, Tomasz Neumann, Safety of Sea Transportation, 2017
E. Qakır, C. Sevgili, R. Fışkın, A.Y. Kaya
Wind-assist propulsion technologies has been one of most invested industry last decade because of the potentially offering double-digit fuel savings (MARAD, 2016). Wind-assisted propulsion is the use of a device, such as a wingsail, soft sail, and kite or Flettner rotor, to capture the energy of the wind and generate forward thrust (LR, 2016). Each sail type has advantages and disadvantages based on many factors such as impact on operation, performance, flexibility and installation cost etc. and they provide different fuel-savings capacity (MARAD, 2016). This difference is due not only to the varied technology types, but also to the different options for implementation and the impact of operational factors such as weather conditions and the ship’s route (LR, 2015). Among the wind-assist propulsion devices, Kite is the most efficient and advantageous sail technology (MARAD, 2016). Kite attached to the bow of the ship operate at altitude to maximize wind speeds as shown in Figure 8. According to study of Naajen & Koster (2008), by using Kite of 500 m2 attached to a 300 m towing line at Beaufort 7 with stem quartering wind can yield up to 50% fuel savings for 50.000 dwt tanker theoretically. On the other hand, applicability restrictions due to ship structures, high installing and maintenance cost and unpredictable effect on ship stability are the main disadvantages of wind-assisted propulsion systems (ABS, 2013).
Investigation of the influence of wind-assisted propulsion devices on hull design
Published in Selma Ergin, C. Guedes Soares, Sustainable Development and Innovations in Marine Technologies, 2022
A.Z. Saydam, G.N. Küçüksu, M. İnsel, S. Gökçay
Wind-assisted propulsion is one of the rising technologies for moving towards environment-friendly ship operations. The complex structure of the wind-assisted propulsion systems requires intensive research for development, whereas the implementation on a ship likewise needs thorough investigation.
Considerations regarding the use of rigid sails on modern powered ships
Published in Cogent Engineering, 2018
Gregory Atkinson, Hung Nguyen, Jonathan Binns
By the 1920s, sails were no longer in use on the majority of ocean-going ships. However, the development of sails for powered vessels continued (albeit at a slower pace) and in the 1980s, a number of ships including the Shin Aitoku Maru (Yoshimura, 2002) and Usuki Pioneer (Marine Engineers Review, 1985) were fitted with Japan Marine Machinery Development Association (JAMDA) type rigid sails (Hamada, 1985). Rather than being the primary source of propulsion, these sails were fitted to ships as a means to reduce fuel consumption. The use of sails in this manner is known by a number of terms, including sail-assisted shipping and wind-assisted propulsion.