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concerning power-to-weight ratio, without giving any source or further explanation (S. Stückl, J. van Toor, H. Lobentanzer. EADS Innovation Works, 2012). If there is a fundamental limit to how large an electric motor can be without losing its performances, one can have multiple smaller motors working together to solve this problem. The design, Figure 9 (Mike Rissi. 2010), shows how multiple arrays of axial flux machines can be stacked up to increase the power of the motor without increasing the diameter of the motor. Figure 9 - Multiple arrays stacked up to increase power without increasing the diameter 2.5 Energy storage The only type of energy storage that will be studied is the use of batteries. Other types such as fuel cells are left out. The reason for this is the low efficiency of fuel cells, (Zachary Shahan, 2016). 2.5.1 State of the art lithium ion batteries Current battery technology performance needs to be well understood to make a good comparative analysis between combustion engine propulsion system and a battery-electric propulsion system. The kinds of batteries that are of interest in this study are those that are available to be bought and tested today by anyone (commercially available), in other words proven technology. Performance metrics that are of interest are high power density and high energy density. Cycle-life is also of interest. Lithium ion batteries are currently the technology used in modern electric vehicles and many other electronic devices. This technology has been commercially available since the early 1990s, (Sony, 2016). Since then, steady improvements has been made to the technology in all of the performance metrics mentioned above. In Table 6, some performance metrics are listed for one of the highest performing cells on the market today. 10PDF Image | Electric Propulsion Passenger Jet Airplanes Requirements to realize all-electric propulsion
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