The GEnx-2B is the 747-8-specific variant of the GEnx family, distinguished from the 787’s GEnx-1B by its smaller fan diameter (104.7 inches versus 111.1 inches) and different compressor staging. It brings composite fan technology and modern efficiency to the final generation of the 747 .
GEnx-2B67B Specifications
The primary subject of this technical guide focuses on the GE GEnx-2B67B engine, engineered specifically for High-Bypass Turbofan applications. Below is an essential digest of this powertrain configuration.
• 66,500 lbf takeoff thrust
• 104.7-inch composite fan
• Powers 747-8
• FADEC III controlled
GEnx-2B67B Technical Data
66,500 lbf takeoff thrust; bypass ratio 8.0 at takeoff; overall pressure ratio 44.7; fan diameter 104.7 inches; 1 fan/3 booster/10 HPC compressor stages; 2 HP/6 LP turbine stages .
The GEnx-2B’s architecture reflects the 747-8’s four-engine configuration: with four engines providing redundancy, each individual engine can be optimized differently than a twin-engine design. The composite fan case and blades reduce weight, and the engine’s 66,500 lbf thrust rating is sufficient for the 747-8’s maximum takeoff weight across four powerplants. Like all GEnx engines, it features FADEC III control and a TAPS combustor for emissions reduction .
| Takeoff Thrust | 66,500 lbf |
|---|---|
| Bypass Ratio | 8.0 (takeoff) / 7.4 (top-of-climb) |
| Overall Pressure Ratio | 44.7 (takeoff) / 52.4 (top-of-climb) |
| Fan Diameter | 104.7 in |
| Compressor Stages | 1 fan / 3 booster / 10 HPC |
| Turbine Stages | 2 HP / 6 LP |
| Fuel | Jet A / Jet A-1 |
Aircraft Powered by the GEnx-2B67B
This engine model is deployed across various operational frameworks. Here is a breakdown of the typical machine or vehicle applications using this unit:
Boeing 747-8, Boeing 747-8 Freighter
Pros & Advantages
Composite fan technology; modern efficiency for the 747-8; FADEC III control; TAPS combustor.
Cons & Disadvantages
Lower thrust than GEnx-1B variants; four-engine redundancy reduces per-engine optimization pressure.
Frequently Asked Questions (FAQs)
Q1: What aircraft uses the GEnx-2B67B?
A1: The GEnx-2B67B powers the Boeing 747-8 and 747-8 Freighter .
Q2: How does the GEnx-2B differ from the GEnx-1B?
A2: The -2B has a smaller fan diameter (104.7 in vs 111.1 in), different compressor staging (3 booster stages vs 4), and is optimized for the four-engine 747-8 rather than the twin-engine 787 .
Q3: What is the GEnx-2B67B’s bypass ratio?
A3: 8.0 at takeoff and 7.4 at top-of-climb .
Yes, like all GEnx engines, it features carbon-fiber composite fan blades and fan case .