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6 Think:Act Aircraft Electrical Propulsion The A380 uses a combina- tion of electro-hydrostatic actuators (EHA), in which electrical power generates local hydraulic pressure to power an actuator, and electrical back-up hydraulic actuators (EBHA)1). Despite these advances, electrical systems do come with the drawbacks of requiring advances in power electronics to handle the ever-increasing loads, and the need to dissi- pate, or put to use, excess heat created by losses within the electrical power chain. However, as a result of the ad- vantages of increasing electrification in terms of reduced weight, greater reliability, lower maintenance costs and increased efficiency, we expect to see a continuation or 1 Conventional hydraulic servo-control actuators are also used B PENETRATION OF ELECTRICAL SYSTEMS BY AIRCRAFT TYPE Many aircraft now employ electric systems, and/or a mix of hydraulic and electric systems. even acceleration of the MEA trend as long as the current higher costs of some electrical systems can be restrained. As safety in aviation is of paramount importance, we ex- pect the changes to be evolutionary, implemented through step-by-step adoption of electrically-powered equipment in additional aircraft systems. ELECTRICAL PROPULSION Compared to the evolutionary MEA trend, Electrical Pro- pulsion represents a radical change from today's propul- sion technologies, although Electrical Propulsion is not without historical precedent. In the summer of 1884, the year after Tissandier's experimental dirigible flight, the battery-powered La France made its maiden flight. La France, built by Ar- thur Krebs and Charles Renard, both military officers in the French Army, was the first fully-controlled airship which was able to return to its starting point in good weather conditions. Whilst many other inventors have tried to use elec- trical power in aircraft since the first flights, the next major milestone was only achieved in 1973, when the NiCad-battery powered HB ME-1, the first fixed wing manned electrically-propelled aircraft, made its first flight. The next remarkable step was achieved in 1979, Boeing 737 A380 EHPF EHPF EHPF EH PF EHPF EH PF EHPF EH PF EHPF EH PF EHPF EH PF E Electric Source: Airbus, Boeing, Lockheed Martin, Roland Berger Boeing 787 A350 EHPF EHPF EHPF EHPF EHPF EHPF EHPF EHPF EHPF EHPF EHPF EHPF F-35 JSF EHPF EHPF EHPF EHPF EHPF EHPF EnvironmentalControlSystem Flight Control System Landing Gear Wheels & Brakes Ice Protection Thrust Reverser H Hydraulic P Pneumatic F FuelPDF Image | Aircraft Electrical Propulsion The Next Chapter of Aviation 2017
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