Open‑Fan RISE Engine from GE and Safran Begins Full‑Scale Testing, Aiming for 20% Fuel Cut

After years of wind‑tunnel work and scaled‑down prototypes, the open‑fan engine that GE Aerospace and Safran have been polishing for almost a decade is finally stepping into a full‑size test cell. The project, officially called Revolutionary Innovation for Sustainable Engines (RISE), aims to shake up the way narrow‑body jets are powered.

Unlike conventional turbofans, the RISE design leaves the fan blades exposed – no bulky nacelle around them. That might look odd at first glance, but it lets engineers fit a much larger fan without adding prohibitive weight. Bigger blades can move more air while spinning a little slower, which translates into better thrust for less fuel.

CFM International – the joint venture that brings together GE’s aerospace muscle and Safran’s expertise in aircraft engines – says the goal is bold: cut fuel consumption by more than 20% compared with today’s best‑in‑class engines. If the numbers hold up, airlines could see roughly the same reduction in CO₂ emissions when burning conventional jet fuel.

The current phase isn’t about building a production‑ready engine; it’s about proving that the hardware can survive the messiness of real flight. Engineers are subjecting the full‑scale front module to simulated bird strikes, ice accretion, dust ingestion and other harsh conditions inside an 8‑meter test cell at Villaroche. Those trials will tell whether the open‑fan can meet certification standards and stay reliable day after day.

“Our engineers are doing a fantastic job maturing the most advanced technologies the industry has seen, while balancing that with decades of operating experience,” said Gaël Méheust, CFM International President & CEO, in a recent press release. He emphasized that durability and maintainability are just as important as raw efficiency.

Arjan Hegeman, GE Aerospace’s vice‑president of Future of Flight Engineering, added that the open‑fan architecture is new, but the individual technologies – such as composite fan blades and advanced aerothermal designs – have been proven over many years. “We’re testing real, full‑size hardware now, showing genuine progress and a renewed ambition to deliver step‑change efficiency for the future of air travel,” he noted.

Meanwhile, Safran’s Pierre Cottenceau highlighted that the first high‑speed low‑pressure turbine, a key piece of the fan system, has already logged more than 1,000 test hours. “The RISE program is gaining strong momentum, moving from concept toward reality,” he said, pointing to a workforce of over 2,000 engineers driving the effort.

Although the engine won’t appear on commercial aircraft until perhaps the 2030s, the testing phase marks a critical milestone. If the open‑fan can deliver on its promises, the aviation industry could finally have a genuine pathway to big fuel savings and lower emissions without sacrificing performance.