Animated mesh and a static mesh combined

Is there a way of combining a animated object ( ie rotors ) with another object ( like the body of the aircraft ) into one object and keeping the animation?

Besides making a blueprint. I am trying to export out as a glTF file and keep the animation of the rotors.

Not familiar with combining animated and non animated actors into a single blueprint. It might also depends how the animation is made.
Did you try using the “convert selection to blueprint class” button in editor?

For animation gltf export should support animation sequences and level sequences:
https://epicgames.ent.box.com/s/pd2h101708xqofbk4eqfzbko36iu2u7l