“…It is important to note that available studies make use of different parameters in their models in terms of technology specification (e.g., number, dimensions, and technical specifications), ships (e.g., type and size of the ships, speed), wind conditions, and routes. As shown in the parametric study of [68], for ships fitting a Flettner-rotor, the diameter, height, rotating speed, installed location, and average voyage speed have an impact on the resulting fuel saving. Therefore, a direct comparison of results between different studies is challenging.…”