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            <title xml:lang="en">Towards an Aircraft with Reduced Lateral Static Stability Using Differential Thrust</title>
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              <p>In the context of aircraft drag reduction, we study the possibility of reducing the area ofthe vertical tail using Distributed Electric Propulsion (DEP) while maintaining lateral stabilitywith active Differential Thrust (DT). Distributed Electric Propulsion is usually thought of asa mean to increase aerodynamic efficiency by exploiting the benefic effects of accelerating airaround key parts of the aircraft. However, it can also be seen as a collection of actuationdevices generating additional moments through Differential Thrust. When the engines aredistributed along the lateral axis, the aircraft designer may take advantage of the increase ofcontrol authority on yaw to reduce the static stability or the control authority provided bythe Vertical Tail (VT). This in turn would allow a reduction of vertical tail surface area. Inorder to explore and assess this idea, we suggest a framework to compare flight qualities ofa traditional configuration versus a configuration using Distributed Electric Propulsion andDifferential Thrust. The framework provides information on the flight envelop and stability ofthe aircraft by computing a map of the equilibriums. Thanks to a global approach, it allows tostudy any aircraft or DEP configurations in any flight phase. In addition, a key feature of theframework is the inclusion of the VeDSC[1] method to compute analytically the contribution ofthe vertical tail to lateral stability. It allows to study effects of a 30% reduction of VT surfacearea. Here are presented the first results and potential of using differential thrust to reducethe area of the vertical tail and the reasons for us to continue developing this framework.</p>
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