This is a little project I have worked on for a while. It is rigged and has materials, as well as an animation included in the .blend for you to mess around with. You can tighten and release the nozzle by scaling the center empty (named "Blade Controller"). You can also move around the entire model with the box surrounding the engine. I would like to give credit to Chris Kuhn for his awesome tutorial on CG Cookie. You can find his tutorial here: http://cgcookie.com/blender/2014/04/29/rigging-jet-engine-nozzles-blender/