Our Project


project description

During 8 months 12 ETH mechanical and electrical engineering students, will develop a 4-seater electrical airplane with modular batterry system, based on a Sling TSi. The ETH focus project has started in Sept. 2020 and will end in May 2021.



Development of an efficient electric drive train


New development of a modular battery system


Certifiability of the Aircraft

Project areas


Promoting highly motivated young ETH engineers and creation of public enthusiasm for an electrified general aviation.


For the first time in human history we can have sustainable operative air transport and reduce CO2-emissins by 100%, as well as reducing noise emission by 75%.


With the ETH focus project we build an electric aircraft with one of the largest battery ranges. ETH aims to achieve trend setting technical fundamental research for electric drive trains in the aviation industry.


With the current improvment of battery technology the electric aviation offers medium and long term intresting economic perspectives. The nessecary knowledge will be deepend together with indusrty partners and therfore enforces the swiss industry.

Projekt Timeline

November 2018 - June 2019

Foundational research on e-aviation

For 5 months the two ETH mechanical engineering students Nicolai Solenthaler (1) and Alexander Weiser (2) researched the electric aviation cooperation with «Deutsches Zentrum für Luft- und Raumfahrt e.V.» (DLR) and further partners. Within their bachelor’s thesis they designed a 6-seater electric aircraft concept with innovative drive train and a range of up to 500 km
November 2018 - June 2019
July 2019 - September 2019

Analysis of viable aircrafts

For the development of a real plane multiple aircrafts were analysed. Since the beginning the 4-seater Sling TSi by «Sling Aircraft» from South Africa was among the favourites. The first Skype-Call with Sling Aircraft confirmed mutual interest and ended in a «Letter of Intent», the base for a feasibility study.

July 2019 - September 2019
October 2019 - December 2019

Machbarkeitsstudio E-Sling

Based on the Sling TSi an optimised electrified version «e-Sling» was designed. It was apparent that for maximal range the wingspan of 9.5 m had to be increased by roughly 1 m. Further adaptions of the Sling TSi for the electric motor and for the wings to place the modular and cooled batteries are necessary.

October 2019 - December 2019
January 2020 -May 2020

Groundwork e-Sling focus project

In February 2020 Alexander Weiser, meanwhile ETH Master student, travelled to South Africa for 3 months to do the groundwork. During his time at Sling Aircraft he will develop the modified aircraft structure. In parallel further project partners are searched for and the project’s organizational structures are developed.
January 2020 -May 2020
June 2020 -September 2020

Manufacturing aircraft structure

The modified aircraft structure has been manufactured by Sling Aircraft and shipped to ETH in Switzerland. The search for sponsors and project partners was continued. Further the organizational structures were finalized.

June 2020 -September 2020
September 2020 – Mai 2021

Focus project

For 8 Months, 12 ETH mechanical and electrical engineers will realize the ETH e-Sling focus project in collaboration with project partners, sponsors and further supporters.

The picture shows the state of construction as of 10 March.

September 2020 – Mai 2021
August 2021 - August 2021

Demonstration flights and sponsor events

After a successful project the e-Sling will be used for demonstration flights, sponsor events and non-commercial passenger flights.
August 2021 - August 2021

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