I read this on Wiki about Burton films Batmobile:
"Every gadget seen on the Batmobile used in these films was fully functional, including the jet engine, which consumed fuel at such a high rate that there was only enough fuel capacity to run it for the approximately fifteen seconds of the longest shot in which it could be seen operating."
Oh, I forgot to say, I really don't worry about Enterprise redesign. A good story is more important, I'm sure Enterprise will look fine.