First time post for me. I have been using Blender for a few months now, and I am having the hardest time trying to get a very light trail of exhaust to come out of a jet engine as a plane flies through the sky. The plane has four engines so this obviously complicates things. The plane has no afterburners so I do not require any flames to come out. Any helpful links or YouTube videos would be greatly appreciated. I am using Blender 2.7.