Patent ID: 7850417

Claim:
An engine arrangement for a contra rotating engine, the arrangement comprising: a first propeller assembly and a second propeller assembly arranged to rotate in opposite directions, each of the first propeller assembly and the second propeller assembly including propellers; a first actuator for angular displacement of the propellers of the first propeller assembly and a second actuator for angular displacement of the propellers of the second propeller assembly, wherein the first propeller assembly and the second propeller assembly are associated with an epicyclic gear assembly that includes a planet gear set associated with a carrier of the epicyclic gear assembly, one of the first propeller assembly or the second propeller assembly is associated through the carrier of the epicyclic gear assembly to provide rotation, at least one of the first actuator and the second actuator has an actuator rod extending through the carrier and the actuator rod includes a rotational de-coupler to allow contra rotation of the associated first propeller assembly or the second propeller assembly to the direction of rotation of the carrier, and the actuator rod passes between planet gears in the epicyclic gear assembly.