Abstract Emissions from aviation have become a focus of increasing interest in recent years. The growth of civil aviation is faster than nearly all other economic sectors. Increased demand has led to a higher growth rate in fossil fuels consumption by the aviation sector. Despite more fuel-eficient and less polluting turbofan and turboprop engines, the growth of air travel contributes to increase pollution attributable to aviation. Aircraft are currently the only human-made in situ generators of emissions in the upper troposphere and in the stratosphere. The depletion of the stratosphere's ozone layer by CFCs and related chemicals has underscored the importance of anticipating other potential insults to the ozone layer. Different possible solutions have been advanced to reduce the environmental impact of aviation, such as electriication of ground operations, optimization of airline timetables and airspace usage, limitation of cruise altitude and increased use of turboprop aircrafts. Those improvements seem very limited answers, which allow only marginal reduction of the environmental footprint of air transport. Breakthrough concepts such as the all-electric aircrafts must be considered. Today state of electric-propulsion is demonstrating a lack of performance and operative range if compared to traditional propulsion concepts. This paper presents a novel concept which has been only envisaged before based on the increase of the performance and range of electric airplanes by an effective cogeneration on board. This concept aims to allow effective and more eficient electric aeronautic propulsion through next generation of green all electric propulsion. Introduction Aviation growth has produced extraordinary economic and social beneits and transformed society by ensuring an effective transport mode on global scale which way “shrunk the planet” using an effective and eficient fast transportation of people and goods all over the world [1, 2, 3]. The growth of air trafic has been spectacular, and is expected to continue in the future. The recent development of high performance engines and in by increasing their eficiency and by reducing energetic consumption of air transport has produced interesting results, but still failed to ensure a greener and environmental footprint of aviation [4]. Aeronautic transport is facing some fundamental issues, which can ensure an effective sustainable development in the future. Emissions from aviation have become a focus of increasing interest in recent years. The growth of civil aviation is faster than nearly all other economic sectors, with the only exception of IT sector. Increased demand has led to a higher growth rate in fossil fuels demand by the aviation sector, when compared to other transportation sectors and to world energy demand [5, 6]. Despite more fuel-eficient and less polluting turbofan and turboprop engines, the growth of air travel contributes to increasing pollution attributable to aviation. EU evaluates GH gas emissions from aviation increased by 87% between 1990 and 2006 [7]. Modern jet aircraft are more fuel-eficient and less polluting than 30 years ago [8]. Moreover, manufacturers are committed to achieving reductions in both CO2 and NOx emissions with each new generation of design of aircrafts and engines. The accelerated introduction of more modern aircraft is an opportunity to reduce emissions per passenger kilometre lown Increasing Aeronautic Electric Propulsion Performances by Cogeneration and Heat Recovery 2014-01-2106 Published 09/16/2014 Michele Trancossi and Antonio Dumas Universita di Modena e Reggio Emilia Paul Stewart University of Hull Dean Vucinic Vrije Universiteit Brussel CITATION: Trancossi, M., Dumas, A., Stewart, P., and Vucinic, D., "Increasing Aeronautic Electric Propulsion Performances by Cogeneration and Heat Recovery," SAE Technical Paper 2014-01-2106, 2014, doi:10.4271/2014-01-2106. Copyright © 2014 SAE International Downloaded from SAE International by Michele Trancossi, Friday, September 26, 2014