Character Flight

This is my latest attemp but this one along with the others dont work that well

function Update () { }

//Speed Variable unstable above 25

var speed = 6.0;

var airspeed = 5.0;

var jumpSpeed = 8.0;

var gravity = 20.0;

private var moveDirection = Vector3.zero;

private var grounded : boolean = false;

function FixedUpdate() {

 if (grounded) {

    // We are grounded, so recalculate movedirection directly from axes

    moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));

    moveDirection = transform.TransformDirection(moveDirection);

    moveDirection *= speed;      

      if (Input.GetButton ("Jump")) {

      moveDirection.y = jumpSpeed;

      }

    }

    else {



    //Preserving fall value

    var fall = moveDirection.y;





    var NewmoveDirection = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));

    NewmoveDirection = transform.TransformDirection(NewmoveDirection);

    moveDirection = moveDirection + ((NewmoveDirection * airspeed) * Time.deltaTime);







    //Replacing Y movement value to original fall

    moveDirection.y = fall;

    }



 // Apply gravity

 moveDirection.y -= gravity * Time.deltaTime;



 // restrict to speed and Move the controller

 moveDirection.x = Mathf.Clamp(moveDirection.x, -speed, speed);

 moveDirection.y = Mathf.Clamp(moveDirection.y, -speed, speed);

 moveDirection.z = Mathf.Clamp(moveDirection.z, -speed, speed);

 var controller : CharacterController = GetComponent(CharacterController);

 var flags = controller.Move(moveDirection * Time.deltaTime);

 grounded = (flags & CollisionFlags.CollidedBelow) != 0;

 }



 @script RequireComponent(CharacterController)