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Speed records (Yates, Siemens) DA-36 variants (Boeing FCD, E-Star) Airbus E-Fan Pipistrel Alpha Electro X-57 Pipistrel Taurus G4 250 200 150 100 50 200 400 600 800 Max Takeoff Weight (kg) 1000 1200 1400 Figure 3: Progression of manned electric aircraft demonstrators (data from Table 3) hybrid electric flying testbed known as “E-Fan X”. Built on a BAe-146 platform, the demonstrator will replace one of the four turbofan engines with a 2 MW electric motor. The demonstrator is intended to “explore the challenges of high-power propulsion sys- tems, such as thermal effects, electric thrust management, altitude and dynamic effects on electric systems, and electromagnetic compatibility issues” and is targeted for first flight by 2020 [76]. The E-Fan X will be a turboelectric configuration, with electrical power supplied by a gas turbine and 2 MW generator in the aft section, a large battery pack in the cargo holds, or both. Siemens is aiming to achieve pm significantly higher than the Extra 330LE’s 5.2 kW/kg [73]. NASA is anticipated to flight test the X-57 Maxwell in 2018 and beyond; since there is a great deal of conceptual design work published in the literature, the program is discussed in more detail below. 3.2 Concepts and Studies This section focuses on aircraft designs which have not yet flown and are not imminently expected to fly (except X-57). Conceptual design of aircraft larger than one to four seats started with NASA-funded industry studies beginning in the late 2000s. This resulted in two concepts which have been at least partly published. The Boeing SUGAR (Subsonic Ultra-Green Aircraft) series of studies evaluated several evolutionary and revolutionary designs against NASA N+3 goals. This study is particularly valuable because it provides a fair comparison between a hybrid concept and turbofan concepts with equal technology and mission rules. All of the concepts were sized for 900 nm economic missions with 154 seats. The concepts were a tube-and-wing baseline with current technology (SUGAR Free); a tube-and-wing architecture with estimated 2030s technologies (Refined SUGAR); a high aspect ratio strut-braced tube- 14 Electric Power (kW)PDF Image | Electric, hybrid, and turboelectric fixed-wing aircraft
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