I am still painting my chopper and now wonder if I should spend time doing motion blur renders for the animation or substitute the blades for pre blurred verisons. Perhaps wedge shapes with a blurry blade Image map (with key) over it. I could rotate these without the extra render time.
But then I wonder if I would be sacrificing some cool blur of the rest of the model, I will be compositing it into some real video plates later. These naturally have lots of real blur already!