The CFM RISE Open Fan Engine, the Return of the Propfan, and Why GE and Safran Think They Can Finally Solve the Problem That Beat Them in the Nineteen Eighties
CFM International's RISE program targets 20%-plus fuel efficiency over today's LEAP engines by removing the nacelle and exposing fan blades - a concept the 1980s couldn't close out, now back with better physics support.
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