The European Commission launched an Open Rotor demonstration in 2008 led by Safran within the Clean Sky program funded with 65 million euros over eight years. A demonstrator was assembled in 2015, and ground tested in May 2017 on its open-air test rig in Istres, aiming to reduce fuel consumption and associated CO2 emissions by 30% compared with current CFM56 turbofans.[63] After the completion of ground testing at the end of 2017, Safran's geared open rotor engine had reached technology readiness level 5.[64] The demonstrator's twelve-blade front propeller and ten-blade back propeller had diameters of 13.1 and 12.5 ft (4.0 and 3.8 m; 160 and 150 in; 400 and 380 cm), respectively. The demonstrator, based on the core of the Snecma M88 military fighter engine, uses up to 12,200 horsepower (9 megawatts), provides a thrust of about 22,000 lbf (100 kN), and would cruise at a speed of Mach 0.75.[65] Safran's future open rotor engine, however, would have a maximum diameter of almost 14.8 ft (4.50 m; 177 in; 450 cm).[66]