How do I make a rocket?

I’m trying to create a rocket, where you would press the space bar, and hold it to keep going up, and you could use wasd to control which way the rocket faces. How would I create a rocket like this? I had looked at a video of how to do it with constant force, but for some reason Unity came up with an error that “constantForce” was obsolete. I found that strange especially since it was a component that I could add to the rocket itself. Any help?

You can use the AddForce () function instead of the constant force function.

IMPORTANT: Be sure to add a Constant Force Component to your rocket.
Create a C# script on your rocket and attach this to it:

    ConstantForce thrust;
        	public Vector3 rocketDirection;
        	Vector3 copy;
        	public float xlrate;
        	void Start () {
        		thrust = gameObject.GetComponent<ConstantForce> ();
        		copy = rocketDirection;
        	}
        	
        	void Update () {
        		if (xlrate >= 20f) {
        			xlrate += .025f;
        		}
        		if (Input.GetKey (KeyCode.Space)) {
thrust.force = rocketDirection * xlrate;
        			rocketDirection = copy;
        		}
        		if (Input.GetKeyUp (KeyCode.Space)) {
thrust.force = rocketDirection * xlrate;
        			rocketDirection = Vector3.zero;
        		}
        	}
        }

Note: Set the xlrate to something reasonable like 2 or 3. And for the Y position on rocketDirection, somewhere between 10 and 20.