A simple, robust and systematic control solution for open rotor control with a differential gearbox is disclosed. When the two counter rotating rotors of a CROR engine are conditioned by the differential gearbox, the two rotors speeds are coupled for given...

A propulsion engine 20 for an aircraft comprises a first fan 30 having a set of first blades 32 and a second fan 40 having a set of second blades 42. There is provided a first angular pitch adjustment mechanism 50 coupled to the first set of blades 32, a s...

A back-up featherer is provided for an engine arrangement having a main hydraulic actuator which angularly displaces propellers of a propeller assembly of the engine arrangement. The engine arrangement further has one or more fluid supply lines for transfe...

A back-up featherer is provided for an engine arrangement having a main hydraulic actuator which angularly displaces propellers of a propeller assembly of the engine arrangement. The back-up featherer has a back-up hydraulic actuator (80) for angular displ...