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CFM Gains Confidence in Open-Fan Technology After RISE Series Success

CFM Gains Confidence in Open-Fan Technology After RISE Series Success
Progress and Technological Advances in the RISE Program
CFM International has reaffirmed its commitment to open-fan engine technology following a series of significant milestones announced ahead of the 2026 Farnborough Airshow. At a press event in London on July 18, Gaël Méheust, President and CEO of CFM International, underscored the company’s dedication to “preparing the future of aviation” through its RISE (Revolutionary Innovation for Sustainable Engines) program. This initiative integrates a range of advanced technologies, including open-fan architectures, compact engine cores, and hybrid electric propulsion systems.
Pierre Cottenceau, CFM’s Vice President of Engineering, Research and Technology, detailed the program’s progress over the past five years, highlighting the completion of more than 500 test campaigns and over 500 hours of wind tunnel testing. These efforts have bolstered confidence in moving forward with ground testing of the open fan later this decade. With preliminary design reviews for both the open fan and outlet guide vanes (OGVs) now finalized, CFM is preparing to manufacture hardware for ground test demonstrators. The OGVs, which manage airflow behind the fan, are essential for enabling open-fan engines to operate efficiently at speeds and altitudes comparable to current turbofan engines.
Arjan Hegeman, Vice President of Future of Flight Engineering at GE Aerospace, emphasized the tangible progress made with full-scale open-fan hardware testing. He also highlighted durability benefits revealed through dust ingestion tests, noting that open-fan designs ingest over 50% less dust than traditional ducted engines. This reduction leads to lower operating temperatures and significantly extends engine time on wing.
In addition to open-fan developments, CFM has completed the preliminary design review for its compact core systems and conducted over 2,000 cycles of dust ingestion testing to evaluate next-generation high-pressure turbine (HPT) airfoil technologies. The program leverages supercomputing resources in Germany and the United States to optimize designs for acoustics and aerodynamics, further advancing its technical objectives.
Hybrid Electric Systems and Industry Challenges
Alongside the RISE program’s core developments, CFM’s parent companies, Safran and GE Aerospace, are actively advancing hybrid electric propulsion technologies. GE Aerospace recently completed two hybrid electric engine ground tests, demonstrating the viability of electric propulsion with and without energy storage. Meanwhile, Safran has launched PHILEAS, a full-scale engine demonstrator equipped with two electric machines, at its Istres facility in France. This project targets the next generation of short- and medium-range aircraft.
Despite these technological strides, CFM faces considerable challenges in bringing open-fan technology to market. The integration of turboprop and turbofan features presents complex engineering hurdles, requiring extensive testing to ensure reliability and maintainability. High development costs remain a significant concern, and the market response has included skepticism from traditional engine manufacturers regarding the performance and cost-effectiveness of open-fan designs. Competitors are accelerating their own open-fan and hybrid engine initiatives, forming strategic partnerships and seeking expertise to remain competitive. Boeing’s cautious stance on adopting new propulsion systems reflects a broader industry hesitancy toward rapid change.
In a related announcement, CFM confirmed it has secured certification from both the Federal Aviation Administration (FAA) and the European Aviation Safety Agency (EASA) for its LEAP-1B high-pressure turbine durability kit. This certification underscores ongoing efforts to enhance current engine offerings while simultaneously pursuing next-generation technologies.

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