Direction of rotation and ApplyForce

Hello, I am trying to write a function which will create a visual vector on a rigidbody. Then this vector can be rotated with mouse. When vecotr rotation is finished a force is added to that rigidbody. My code is not working and I'd like to hear tips and suggestions. Thanks in advance for your answers.

 var arrowPrefab : GameObject;
 var speed : int;
 var forceMultiplyer : float;
 
 private var arrowInstance : GameObject;
 
 function Update () {
     if (Input.GetMouseButton(1)) {
         if (arrowInstance == null) {
             arrowInstance = Instantiate(arrowPrefab, transform.position, Quaternion.identity);
         }
         else {
             if (Input.GetMouseButton(0)) {
                 arrowInstance.transform.Rotate(0, 0, Input.GetAxis("Mouse Y") * Time.deltaTime * speed);
             }
             else {
                 arrowInstance.transform.Rotate(Vector3(Input.GetAxis("Mouse Y"), Input.GetAxis("Mouse X"), 0) * Time.deltaTime * speed);
             }
         }
     }
     
     if (Input.GetMouseButtonUp(1)) {
         if (arrowInstance != null) {        
             var forceVector : Vector3 = new Vector3(forceMultiplyer,
                                                     forceMultiplyer,
                                                     forceMultiplyer);
                                     
             rigidbody.AddForce(arrowInstance.transform.rotation * forceVector);
             Destroy(arrowInstance);
         }
     }
 }