Why CFM's open-fan engine must solve the acoustic problem that killed GE's 1980s open-rotor program

What was the issue and what impact did it have?
Flightglobal

Airbus calls for open-rotor alternative to CFM’s RISE engine

Airbus is actively encouraging propulsion manufacturers to explore open-rotor engine concepts to offer competition to CFM International’s RISE programme. Although still a demonstrator, the RISE engine ...
Flightglobal

Airbus targets 25% efficiency gain from next narrowbody with help from CFM’s RISE

Airbus chief executive Guillaume Faury has made clear he expects the European airframer’s next narrowbody jet will be 25% more efficient than today’s models – and he is banking on CFM International’s ...
Reuters

Airbus CEO upbeat on new engine technology, but says jury still out

WASHINGTON, Sept 10 (Reuters) - The head of European planemaker Airbus (AIR.PA), opens new tab said novel open-rotor technology being tested by engine maker CFM International offers promising ...
Aviation Week

SINGAPORE AIRSHOW: GE confirms open rotor testing

Wind-tunnel testing of multiple configurations of sub-scale blades for GE's Open Rotor engine is being conducted to identify the optimum blade design for the engine's two counterrotating stages of ...