General Electric has brought the propfan engine back from the dead as part of a joint venture with Safran Aircraft Engines.
Propfans generally feature numerous blades that are often heavily twisted and swept back, with the rear blades twisted opposite to the front blades. Some models utilize counter-rotation, while others have stationary blades that serve as variable-pitch stator blades to enhance flow recovery., advancements in aviation propulsion have been made by utilizing new technologies that enable larger fan sizes and higher bypass ratios.
Recently, fuel prices have increased greatly, and the aviation industry is now focused on reducing the carbon footprint of its energy-intensive business. This has led to a renewed interest in propulsive efficiency. While batteries and hydrogen cannot fully replace kerosene as an energy source, increasing the mileage has become crucial. As a result, in collaboration with Safran Aircraft Engines, GE introduced a new UDF airliner engine called the "Rise" in 2021.
The "Rise" engine is highly adaptable and can be conveniently installed on the top or bottom of an airliner's wing. The team has partnered with Airbus to develop an open fan demonstrator, expected to take flight in the mid-2020s. Until such time, GE has built some prototypes, and CFM has conducted around 400 ground tests.
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