More technical source: https://aviationweek.com/aerospace/aircraft-propulsion/rolls-royce-begins-ultrafan-tests-amid-restructuring-cost-cuts https://aviationwe

More technical source: https://aviationweek.com/aerospace/aircraft-propulsion/rolls-royce-begins-ultrafan-tests-amid-restructuring-cost-cuts https://aviationweek.com/aerospace/aircraft-propulsion/rolls... Notable: The fan is driven through gearing from the low-pressure turbine stage. > ... with its power gearbox and Advance3-based core, represents a radical shift away from the traditional three-shaft designs that have been the hallmark of Rolls-Royce’s large engine configurations since the 1960s.