She may have been inspired by her older brother George’s experiences during the First World War, when he fought first as an aviation observer, got shot down and later trained and flew as a pilot, earning the Légion d’Honneur.

The Lumiere aeroplane company was set up by Louis de Monge, a Belgian engineer living in Paris, to design aircraft.

In 1929 Guyot moved to work as an aeronautical engineer at the "Hydravions Lioré & Olivier", a much larger company, which designed and manufactured seaplanes and military aircraft, including the LeO 45.

She remained there until 1935, working on fuselages and hulls of several seaplanes, and in collaboration with designers, Paul Asantchéef and André Violleau, who thought highly of her.

[2] In 1932, Guyot learnt to fly and bought a second-hand light plane, a Farman 231 with lowered wings, two-seater tandem roadster, Renault 95 horsepower engine, maximum speed around 186km / h12.

Between 1932 and 1939, Guyot took out six patents in conjunction with engineer and entrepreneur William Arthur Loth (1888-1957),[6] concerned with improving the lift of the rotator blades.

In the dossier compiled by her brothers in 1947, making the case for her Resistance Medal, Sébastienne Guyot was described as "Head of the Helicopter Service at the Arsenal de l'Aéronautique", although details of her role there remain sketchy.

René explained that he had been appointed the "commandant du camp" the representative of all the other prisoners in dealing with the Wehrmacht, and felt that he could not abandon his men as his escape could endanger them.

She was discovered by German troops and found to be in possession of a map with instructions for evading them as well as a compass (her family think she travelled in her Renault car).

George rushed her to Paris where a surgeon saved her hand, but the disease progressed and she died in great pain at the Broussais Hospital on 22 August 1941.