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2 Literature study A literary study was made to get a deeper understanding of passenger jet airplane design, developments in electric propulsion for airplanes, electric ducted fans, and energy storage technology. 2.1 Passenger jet airplane design A modern passenger jet airplane was chosen as a reference. The Boeing 787-8 Dreamliner was found to be the best fit for this study because of the modern construction and the availability of needed performance specifications as well as the data files for simulating flights in Piano-X. 2.1.1 Weight Distribution Weight data on the Boeing 787-8 was gathered so that an understanding of how much weight can be reserved for energy storage could be estimated. The main thing to notice about the weight distribution, Figure 1, is that the weight of the airplane decreases as the airplane burns fuel throughout the flight. 250000 200000 150000 100000 50000 0 Fuel weight Standard Payload weight Operating empty weight 85858 30563 21280 21280 120792 120792 Maximum Take-off weight Maximum Landing weight Figure 1 - Weight distribution in a Boeing 787-8 The 787-8 has a maximum take-off weight of 228 tons, and a maximum landing weight of 172 tons. The longer version that has the same wing area, the 787-9, has a maximum take-off weight (MTOW) and maximum landing weight (MLW) of 254 and 193 tons respectively, (Flugzeuginfo, 2016). To maximize the energy storage capacity of the airplane, the total weight will have to be maximized as well. In a battery-electric airplane that is the same as the take-off weight and landing weight since no fuel is leaving the plane in the flight. Since the 787-9 can handle 193 tons and has the same wing 3 Mass [kg]PDF Image | Electric Propulsion Passenger Jet Airplanes Requirements to realize all-electric propulsion
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