Clément Ader

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Clément Ader (1841–1925) was a French inventor and engineer who lived near Toulouse. He is best known for his early work in aviation, but he also made important advances in electrical and mechanical engineering.

Before flying, Ader worked with electricity and sound. He improved on the telephone and in 1880 helped set up a telephone network in Paris. In 1881 he invented the théâtrophone, a system that let people listen to performances with stereo-like sound from a distance.

Ader later turned his attention to flight. He studied how birds fly and built his first flying machine, the Éole, in 1886. The Éole looked bat-like and used a steam engine of his own design. It had a wingspan of about 14 meters and weighed about 300 kilograms. On 9 October 1890, Ader attempted to fly the Éole. Modern historians say he made a powered take-off and a short, low flight of around 50 meters.

He then began work on a second aircraft called the Avion II (also known as the Zephyr), but it was never completed. In 1897, with support from the French War Office, Ader built the Avion III. This large, bat‑like plane had a wingspan of about 15 meters and was powered by two steam engines, each producing around 30 horsepower, driving two four‑bladed propellers. On 12 October 1897 Ader conducted taxiing trials, and two days later he attempted a flight. A gust of wind caused the craft to crash, and the project’s funding was later withdrawn. In 1910, an official report said the flights had been unsuccessful.

Despite this, Ader continued to advocate for aviation. In 1909 he published L’Aviation Militaire, a popular book that described ideas about early air warfare and even a concept for an aircraft carrier with a flat deck and hangar bays. His work helped popularize the word avion for airplanes in French. He is sometimes called the father of aviation. France honored him with a postage stamp in 1938, and Airbus named a flight‑related site after him.