He drove a steam-powered Gardner-Serpollet motorcar in the early 1900s, and then switched to Hotchkiss for both the world's first Grand Prix at Le Mans in France and the inaugural Targa Florio in Sicily.

[1] His wife, Madame Motann Le Blon, shared his passion for motoring, regularly accompanying him as riding mechanic in his races, and watching during his flying exploits.

[1] Some sources report that in 1901 he drove the Gardner-Serpollet steamer to seventh place in the Paris-Berlin trail, (possibly based on an erroneous claim in his obituary in the New York Times,[4][9] whilst others, including contemporaneous newspapers have no mention of him competing.[10][11][12]).

He enrolled at the pilot training school of pioneering French aviator Léon Delagrange, learning to fly the Bleriot XI monoplane.

He rapidly became "as well known as Bleriot" for his skilled, daring and courageous flying, winning the Bradford Cup for the fastest ten laps of the course in his Blériot monoplane.

[2][3][4][16] His renown as an aviator increased when, in February 1910, he set a new five-kilometre record of 4 minutes 2 seconds in his Bleriot XI monoplane at the Héliopolis International Air Meeting near Cairo, Egypt.

[17] Le Blon drowned in a crash landing into the sea on 2 April 1910 while flying in stormy weather at Ondarreta Beach, San Sebastián, Spain, where he had been performing exhibition flights since 27 March.

He was reportedly circling the Royal Palace of Miramar at about 140 feet when the Anzani engine failed; as he attempted to glide back to land, a wing's wire "stay" snapped whereupon the plane flipped and crashed into the sea upside down,[2][4] possibly colliding with some rocks.

[1][18][19][20] At his funeral in San Sebastián the streets were lined with troops, shops were closed, and thousands followed his coffin to the railway station where it was transported to Paris.