CFM International, a joint venture between GE Aerospace and Safran, has started full-scale testing of an Open Fan engine under its RISE program. The open rotor design removes the outer nacelle, allowing a larger fan that moves more air with less acceleration. CFM estimates this cuts fuel consumption by over 20 percent compared to current engines, with equivalent reductions in CO2 emissions. The technology targets narrow-body aircraft and is scheduled for commercial service by the mid-2030s. Engineers are testing full-scale components at a facility in Villaroche, France, simulating bird strikes, icing, and debris ingestion to meet safety standards. The high-speed low-pressure turbine has already logged over 1,000 hours of operation. The RISE program involves more than 2,000 engineers and was launched in 2021. If certified, this engine could lower operating costs for airlines and reduce the carbon footprint of long-haul and transit aviation.
