(See Gramme).

Together with Charles Renard Krebs made a multipolar electric motor in the year 1884.

-It was designed by Arthur Krebs and fitted on the airship "La France".

-With this engine several flights were made in which the device could be controlled in all maneuvers. Krebs made the engine and Renard the airship.

“Krebs and Renard”

"La France in the hangar of Chalais, 1884 "

-The electric motor made by Krebs was a multipolar machine that gave 8 CV with a weight of 96 kg and at a speed of 3,600 rpm, transmitted through a gearbox to the propeller that rotated at 50 rpm.

-The engine was powered by a battery with light-weight cells of chromic acid and hydrochloric acid. Each cell contained a positive silver electrode and a negative-pole zinc pencil.

“Multipolar electric motor”

-The battery weighed 400 Kg and could give 16 CV during an hour, and in this case for 1 hour and 39 minutes.

-The following year, in 1885 the Krebs engine was changed for the Gramme engine. This was a bipolar dynamo of 9 CV, of much lower weight, which allowed to carry a third crew.