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Magazine Contatti

Project Hybris

Structural battery hybrid-electric aircraft.
Winner of the RAeS E-Conditions Fixed-Wing Design Challenge 2015-2016.

Student Team

Andrea Bernasconi, Fabio Biondani, Luca Capoferri, Alberto Favier, Carmen Velarde Lopez de Ayala (Erasmus)


Lorenzo Trainelli ↗, Carlo E. D. Riboldi ↗


RAeS E-Conditions Fixed-Wing Design Challenge 2015-2016

Competition type

International design competition (open to all)


Royal Aeronautical Society ↗


1st place



Hybris is a new general aviation aircraft concept for a 4-seat hybrid-electrc airplane, aiming at demonstrating innovative technologies for drastic chemical and noise pollution reduction, while maintaining competitiveness in terms of operating costs and flight performance. The key element of innovation in the design is the use of structural batteries, i.e. multifunctional composites that can store energy and sustain mechanical loads, which represent a cutting-edge technology likely to unfold its potential in the field of aeronautics.



  1. Machuca F., “La batería permite grandes reducciones de peso en nuestro avión híbrido”, ABS Sevilla, November 7, 2016 (newspaper article).
  2. “Il Politecnico vola in alto grazie al team Hybris”, Storie Polimi, Politecnico di Milano, November 7, 2016 (online article ↗).
  3. Turani I., “Decolla da Brembate Sopra l’idea per l’aereo del futuro”, L’Eco di Bergamo, December 14, 2016 (newspaper article, online article ↗).



  1. Bernasconi A., Biondani F., Capoferri L., Favier A., Velarde Lopez de Ayala C., Gualdoni F., Riboldi C. E. D., Trainelli L., "Aircraft with Electric Battery, in Particular Hybrid Aircraft", European Patent EP3538435A1 (published 14 May 2018; priority date November 14, 2016).
  2. Bernasconi A., Capoferri L., Riboldi C. E. D., Trainelli L., “Hybris – An Innovative Concept for Future General Aviation”, 13th Pegasus-AIAA Student Conference, Berlin, Germany, April 5-7, 2017.
  3. Bernasconi A., Biondani F., Capoferri L., Favier A., Velarde Lopez de Ayala C., Riboldi C. E. D., Trainelli L., "Conceptual Design of a Structural-Battery Hybrid-Electric Aircraft", XXIV Congresso Nazionale AIDAA, Palermo-Enna, Italy, September 18-22, 2017.
  4. Riboldi C. E. D., Trainelli L., Biondani F., "A Sizing Procedure for Structural Batteries in Hybrid-Electric Aircraft", Advanced Aircraft Efficiency in a Global Air Transport System Conference (AEGATS 2018), Toulouse, France, October 23-25, 2018.
  5. Riboldi C. E. D., Biondani F., Trainelli L., "Structural Batteries in Aviation: A Preliminary Sizing Methodology", Journal of Aerospace Engineering, 33 (4): 1-15 (2020).