An engine arrangement

In a contra rotating propeller engine propeller blade assemblies 21, 22 are provided which rotate in opposite directions as a result of association with an epicyclic gear assembly 25 acting as a differential gearbox. A carrier 29 is provided to drive one propeller blade assembly 21. Actuators 36, 37 are provided to cause pitch angle adjustment of the respective propeller blades of the assemblies 21, 22. These actuators, 36, 37, are secured upon a stationary structure and act through actuator rods 40 and appropriate mechanisms to cause such angular pitch adjustment. Rotational de-couplers 38, 39 are provided to rotationally isolate the actuators 36, 37 whilst an actuator rod part 40a acts across the assemblies 21, 22 and a rotational de-coupler 41 to de-couple contra rotation between the assemblies 21, 22 whilst still allowing axial displacement for adjustment of the other propeller blade assembly 22.