.obj can only hold the geometry (I use a tube and flattened sphere); can't contain the animation, so you would still have to animate it yourself. Shouldn't be difficult though, wake just needs to be strectched as the torp leaves the ship. And .obj can store texture info; but not the textures themselves; so I think you'd still have to apply the textures yourself; which I would send also.
But I need to get some shut-eye; so I would have to do it tomorrow evening after work.