Three of his aircraft were displayed at the first Paris Aero Salon, held at the end of December: the Blériot IX monoplane; the Blériot X, a three-seat pusher biplane; and the Blériot XI, which would go on to be his most successful model. The first two of the designs, which used Antoinette engines, never flew, possibly because at this time, Blériot severed his connection with the Antoinette company because the company had begun to design and construct aircraft as well as engines, presenting Blériot with a conflict of interests. The Type XI was initially powered by a REP engine and was first flown with this engine on 18 January 1909, but although the aircraft flew well, after a very short time in the air, the engine began to overheat, leading Blériot to get in touch with Alessandro Anzani, who had developed a successful motorcycle engine and had subsequently entered the aero-engine market. Importantly, Anzani was associated with Lucien Chauvière, who had designed a sophisticated laminated walnut propeller. The combination of a reliable engine and an efficient propeller would contribute greatly to the success of the Type XI.