Rigidbody2D Flight

Hello all,

Been working on this little project with a Rigidbody2D rocket, however, the flight of the rocket is not working quite how I would like it to. I would like the rocket to always move in the direction it is facing, like a jet. As it is now, it kind of Tokyo drifts round corners. This video maybe explains it better:

https://www.youtube.com/watch?v=lJxldkuWuV8

If anyone could shed some light on how to code this I would be most grateful!

Also see images for what I am trying to achieve.

Many thanks in advance!

     public float velocity;
     public float leftRotationSpeed;
     public float rightRotationSpeed;
     
 
 
     void FixedUpdate() 
 
     {
         if (Input.GetKey (KeyCode.UpArrow)) 
         {
             GetComponent<Rigidbody2D>().AddForce(transform.up * velocity);
         }    
 
         if (Input.GetKey (KeyCode.DownArrow)) 
         {
             GetComponent<Rigidbody2D>().AddForce(transform.up * -velocity);
         }    
 
 
         if (Input.GetKey (KeyCode.LeftArrow)) 
         {
             GetComponent<Rigidbody2D>().AddTorque(Input.GetAxis ("Horizontal") * leftRotationSpeed);
         }
 
         if (Input.GetKey (KeyCode.RightArrow)) 
         {
             GetComponent<Rigidbody2D>().AddTorque(Input.GetAxis ("Horizontal") * rightRotationSpeed);
         }
 
     }
 
 }![alt text][1]

[1]: /storage/temp/58457-rocket2.jpg