In February 2012, GE announced studies on a more efficient derivative, dubbed the GE9X, to power the new Boeing 777-8X/9X aircraft. It was to feature the same 128 inches (330 cm) fan diameter as the GE90-115B with an overall thrust decreased by 15,800 pounds-force (70 kN) to a new rating of 99,500 pounds-force (443 kN) per engine with a 10% increase in fuel efficiency. The -8X engine was to be derated to 88,000 pounds-force (390 kN), the bypass ratio was planned for 10:1 and the overall pressure ratio for 60:1 with a new 11-stage high-pressure compressor developing a pressure ratio of 27:1.
In 2013, the fan diameter was increased by 3.5 inches to 132 inches (340 cm). In 2014, thrust was increased from 102,000 pounds-force (450 kN) to 105,000 pounds-force (470 kN) and fan diameter to 133.5 inches (339 cm). The new engine has the largest front fan at 134 inches in diameter with a composite fan case and 16 carbon fiber composite fan blades, it completed its first test run in April 2016. The GE9X have only 16 blades where the GE90 has 22 and the GEnx 18, making the engine lighter and spinning faster to better match the low-pressure fan and turbine.
As it is larger than the GE90, for testing it fits only the 747-400 with larger main gear struts and bigger tires and not the previous -100 GE testbed, and the tested engine is tilted 5° more than the original CF6. Its type certification is planned for the fourth quarter of 2018. #generalelectric #777x #boeing #future #coming #2020vision #space #nasa #aviationlovers #aviationdaily #aviationgeek