Then Santos-Dumont decided to work on heavier-than-air flying machines, which people call airplanes or aeroplanes today. In the fall of 1906, he tried to fly his biplane, the "Santos-Dumont 14-bis" in a field outside Paris. Experts disagree on exactly what counts as flying and what is only a hop in the air, so perhaps his first flight was on September 13 when the "14-bis" stayed in the air for a short distance or perhaps it was in October when it flew for 50 meters, but everyone agrees that Santos-Dumont did fly in the fall of 1906. On November 12, 1906, outside Paris, he flew the "14-Bis" biplane for 220 meters (722 feet) outside Paris, 6 meters up in the air. The 14-bis used a 50-horsepower internal combustion engine, meaning an engine that burned its own fuel inside itself instead of using steam.