What is it about?

Parallel hybrid electric propulsion can reduce the fuel consumption of aircraft with an electric motor installed additionally to the gas turbine that can be downsized or kept at oroginal size. We compare the two design approaches using a mission analysis and optimization framework. We show that the one engine overshoot climb constraint reduces the benefits of downsizing the gas turbine due to additional electric assitance at end of mission.

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Why is it important?

Considering OEI climb requirements, no benefits were found using a design with downsized GTs. Equivalent fuel burns were found for hybrid designs that keep the original size GTs, but do not require electric energy for the OEI overshoot at the end of the mission. Then, it is recommended to size the GT to maintain the emergency climb capabilities with no electric assistance to ensure power availability regardless of remaining battery energy.


This work introduces a new perspective on parallel HE sizing with consideration for the dependency of power capability at aircraft level on the electric energy availability in case of critical mission scenarios such as overshoot climb at the end of the mission.

Dominik Quillet
Universite de Sherbrooke

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This page is a summary of: Impact of OEI requirement on parallel hybrid electric turboprop regional aircraft optimization, Aircraft Engineering and Aerospace Technology, August 2022, Emerald,
DOI: 10.1108/aeat-02-2022-0051.
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