This Exactly Why Boeing Chose GE9X Over Rolls-Royce for 777X!

This Exactly Why Boeing Chose GE9X Over Rolls-Royce for 777X! === #fligtraject #aviation #rollsroyce #boeing === 0:00 Intro 0:31 Rolls-Royce vs General Electric 4:00 The Real Secret: Materials 9:08 The Catch == Thanks to K. Aainsqatsi https://en.wikipedia.org/wiki/Bypass_... Thanks to Duboyong https://en.wikipedia.org/wiki/Carbon_... === This Exactly Why Boeing Chose GE9X Over Rolls-Royce for 777X! When Boeing launched Triple 7X, they made an engine choice that shocked the entire industry. People thought there was no competition. No dramatic showdown between engine makers. Just one: the GE9X, built by General Electric. But in reality, the competition was far more intense than most people imagined. So what happened to the battle between the engine manufacturers? Why Boeing choose GE9X instead of Rolls-Royce? Let's find out. Rolls-Royce vs General Electric At first, a lot of people said there wasn’t really any competition here. But if you believe that… not quite. Go back to around 2011, when Boeing started sending out RFI, followed by RFP, for the Triple 7X program. The requirements were very clear: the new engine had to deliver at least 10% better fuel efficiency than the GE90 one-hundred-fifteen-B. In other words, not just “better,” but good enough to go head-to-head with the A3 50. And the thrust target is close to 100,000 pounds for the Triple 7 Dash 9. Put simply, this was an extremely tough challenge. This Exactly Why Boeing Chose GE9X Over Rolls-Royce for 777X! But neither side disappointed Boeing. On one side, Rolls-Royce came in with the RB thirty-twenty-five — a completely new concept derived from its Trent family. Even on paper, it sounded ambitious: a fan of around 132 inches, a bypass ratio of 12:1, an overall pressure ratio pushing 62:1, composite materials, and titanium aluminide turbine blades… all cutting-edge technologies at the time. They even claimed over 10% better efficiency than the GE90, and up to 15% better than their own Trent 800. But the real “magic” of Rolls-Royce wasn’t just in the specs — it was in the design philosophy. While most engines, like those from GE, use a twin-spool (two-shaft) architecture, Rolls-Royce took a different path with a three-spool design — low, intermediate, and high-pressure shafts. It sounds more complex, but the idea is elegant: each stage can operate at its own optimal speed, like a car with more gears, running smoother and more efficiently across different flight conditions. It also makes the engine shorter and stiffer, helping reduce shaft distortion during long-haul flights. This Exactly Why Boeing Chose GE9X Over Rolls-Royce for 777X! Sounds almost perfect, right? But that kind of refinement comes at a cost. Adding a third spool means more weight, more oil systems, more components. And more importantly, maintenance becomes significantly more complex. On a massive aircraft like the Triple 7X—where airlines are extremely sensitive to operating costs—that’s not a small detail anymore. Meanwhile, General Electric took a very different approach… almost the opposite. Instead of over-optimizing the internal architecture, they went straight after the most fundamental principle of jet engines: bypass ratio. Put simply, if you want better efficiency, don’t push a small amount of air very fast. Push a huge amount of air… just slower.