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Energies 2017, 10(6), 762;

Electric Propulsion Concepts for an Inverted Joined Wing Airplane Demonstrator

Instytut Lotnictwa, 02-256 Warszawa, Poland
Instytut Techniczny Wojsk Lotniczych, 01-494 Warszawa, Poland
Author to whom correspondence should be addressed.
Academic Editor: Jih-Sheng (Jason) Lai
Received: 6 February 2017 / Revised: 19 May 2017 / Accepted: 22 May 2017 / Published: 31 May 2017
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One of the airplane design concepts that potentially allows for significantly increased efficiency, but has not yet been investigated thoroughly, is the inverted joined wing configuration, where the upper wing is positioned in front of the lower one. We performed wind tunnel and flight testing of a demonstrator of this concept, first by applying electrical propulsion to simplify wind tunnel testing, and then the same electrical-propulsion demonstrator performed several flights. As the chosen propulsion method proved to be too cumbersome for an intensive flight campaign and significant loss of battery performance was also observed, the electrical propulsion was then replaced by internal combustion propulsion in the second phase, involving longer-duration flight testing. Next we identified and analyzed two potentially beneficial modifications to the design tested: one involved shifting the center of gravity towards the aft, the other involved modifying the thrust vector position, both with the assumption that electric motors can be applied for propulsion. On this basis, the paper finishes with some conclusions concerning a new concept of electrical propulsion for an inverted joined wing design, combining two ideas: hybridization and distribution along the aft wing leading edge. View Full-Text
Keywords: electric propulsion; inverted joined wing airplane; wind tunnel and flight testing electric propulsion; inverted joined wing airplane; wind tunnel and flight testing

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Galinski, C.; Lis, M.; Hajduk, J. Electric Propulsion Concepts for an Inverted Joined Wing Airplane Demonstrator. Energies 2017, 10, 762.

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