page_title: General Electric GEnx
section_title: Design
hierarchical_section_title: General Electric GEnx / Design
caption_attribution_description: English: Close-up view of the General Electric GEnx engine core. The fan blades and static vanes are visible on the right of the photo. Français&#160;: Vue de détail de l’arrière du corps central d’un moteur General Electric GEnx. La soufflante et ses stators sont visibles sur la droite de la photo.
context_page_description: The General Electric GEnx is an advanced dual rotor, axial flow, high-bypass turbofan jet engine in production by GE Aviation for the Boeing 787 and 747-8. The GEnx is intended to succeed the CF6 in GE's product line.
context_section_description: The GEnx is derived from the GE90 with a fan diameter of 111.1 in (282 cm) for the 787 and 104.7 in (266 cm) for the 747-8.
  To reduce weight, it features 18 composite fan blades, a composite fan case and titanium aluminide stage 6 and 7 low-pressure turbine blades.
  Fuel efficiency is improved by 15% compared to the CF6, the bypass ratio reaches up to 9.0:1 and the overall pressure ratio up to 58.1:1.
  It has a 10 stage high-pressure compressor and is quieter, helped by larger, more efficient fan blades.
  It stays on wing 20% longer, uses 30% fewer parts to lower maintenance costs and has a contra-rotating architecture.
  The Lean TAPS combustor reduces NOx gases with required pressure loss and backflow margin.
  Fan blades have steel alloy leading edges and the composite fan case reduces thermal expansion.
  To reduce fuel burn, the 23:1 pressure ratio high-pressure compressor is based on the GE90-94B, shrouded guide vanes reduce secondary flows and counter-rotating spools for the reaction turbines reduce load on guide vanes.
  To reduce maintenance cost and increase engine life, spools with lower parts count are achieved by using blisks in some stages, low blade counts in other stages and by using fewer stages; internal engine temperatures are reduced due to more efficient cooling techniques and debris extraction within the low-pressure compressor protects the high-pressure compressor.
caption: Detail of GEnx core
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