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Constant force on 2Drigidbodys

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I have a 2D game with a plane. I want this plane to be affected by gravity and have a max speed. right now I'm just using AddForce() and it makes the sprite accelerate indefinitely. I also want to move forward based on the rotation of the sprite. Here's what I have so far: using UnityEngine; using System.Collections; public class PlaneScript : MonoBehaviour { public float maxSpeed = 10f; public Vector2 thrustForce = new Vector2(0, 100); // Use this for initialization void Start () { } // Update is called once per frame void FixedUpdate () { //checks inputs bool move = Input.GetButton ("Thrust"); float Yrotate = Input.GetAxis ("Horizontal"); //adjust thrust forward if (move) { rigidbody2D.AddForce( thrustForce ); } //rotates plane based on A & D keys rigidbody2D.transform.Rotate (0,0,(Yrotate- (2 * Yrotate))*maxSpeed); } } Any help would be greatly appreciated.

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