Orient to velocity

Hello. I believe this is my first post, but I'm having difficulty orienting my rocket to its velocity.

My rocket reacts with gravity, so i want the nose to plummet when there is no force happening
I have tried
Quaternion.Euler(rigidbody.velocity);
which was pulled from a thread asking a rather similar question



This is exactly the mechanism i want because i will be able to slighty turn the rocket, but i want gravity to play a huge role. Any help would be greatly appreciated.

So to recap with no text in between:
How do I get my rocket to face it's velocity?

 

I asked a similar question once & was given this link which helped
http://answers.unity3d.com/questions/14899/realistic-rotation-of-flying-arrow.html

 

Neato! Thanks

 

unfortunately it didnt help. The sprite changes axis and throws it off