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Safran Advances Hybridization Efforts Ahead of Silvercrest Summer Tests

Safran Advances Hybridization Efforts Ahead of Silvercrest Summer Tests
Progress in Hybrid-Electric Propulsion Development
Safran Aircraft Engines is intensifying its hybridization program with plans to test a Silvercrest business jet engine equipped with 250kW electric motors on both the low- and high-pressure spools. These tests are scheduled for this summer in Istres, southern France, marking a significant step forward in the company’s efforts to enhance engine efficiency through hybrid-electric technology.
At Clean Aviation’s annual forum in Brussels on March 18, Delphine Dijoud, deputy vice-president of engineering and research and technology at Safran Aircraft Engines, highlighted hybridization as a vital complement to open-fan architecture. She described it as a “complementary lever” capable of improving power extraction, facilitating power transfer between spools, and enabling real-time engine optimization. This approach aims to deliver tangible efficiency gains in future propulsion systems.
Development Path and Technical Challenges
The current phase of Safran’s hybridization program, supported internally and by France’s DGAC civil aviation authority, builds on a series of incremental trials. Initially, Safran integrated electric power into a small turbofan engine from a start-up, collaborating with its Electrical & Power division to refine engine regulation and control systems. This cautious approach allowed the company to address the complexities of hybrid-electric integration before advancing to larger engines.
In 2023, Safran conducted 300 hours of testing on the Silvercrest engine, a 10,000lb-thrust business jet powerplant whose development was previously halted. These tests involved fitting an electric motor on the high-pressure spool, yielding valuable insights into engine operability, control law impacts, and the dynamic interaction between electric motors and gas turbines. Eric Dalbies, senior executive vice-president of research, technology, and innovation at Safran Group, emphasized the importance of understanding potential risks such as compressor stall caused by rapid power injection.
The upcoming tests will extend this work by installing 250kW electric motors on both the low- and high-pressure spools. These motors are designed to meet the specifications of the RISE open-fan technology demonstrator, developed in partnership with GE Aerospace through CFM International. Dijoud confirmed that the integration will align closely with RISE’s power requirements and operational use cases.
Despite the promising progress, Safran faces significant engineering challenges. Integrating electric motors into gas-turbine engines demands advanced systems capable of managing larger electrical components while ensuring compatibility with existing aircraft infrastructure. The safe and efficient incorporation of high-voltage electrical systems remains a critical hurdle.
Industry Context and Future Prospects
Market responses to Safran’s hybrid propulsion initiatives have been varied. While some traditional engine manufacturers remain cautious, there is growing interest among early adopters in the business jet sector. Competitors such as GE and Rolls-Royce are anticipated to accelerate their hybrid technology development efforts, potentially forging new strategic partnerships to enhance their competitive positions.
Safran’s hybrid research also forms part of the Clean Aviation OFELIA project, which focuses on open-fan technology. The company is actively pursuing funding for a full-scale ground-test demonstrator through Clean Aviation’s fourth call for proposals, closing in May. The European Union has allocated €60 million to support up to three such demonstrators, reflecting the increasing momentum behind hybrid propulsion technologies within the aviation industry.

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