Collision between a flare and a object doesn't occur...

Hey There!

So I've this problem where I'm trying to make a "space torpedo" hit the target, however when both colliders interact, the script that destroys the torpedo doesn't work, and the torpedo stays there indefinitely...

The Ship has a group of 6 colliders, and the torpedo is an empty game object with a sphere Collider and a lens flare inside it. In order to the lens flare glow through the collider, I placed the primary game object in a TransparentFX layer.

And then I've this script that checks if it doesn't collide with the object that fired it, and if it hits a target, destroys itself:

 function OnCollisionEnter (hit : Collision) {
     
     if (hit.transform != launched.transform)
     {
         
         Destroy(gameObject);
 Instantiate(explosion.transform.gameObject, transform.position, transform.rotation);

     
     }
 
 }

So, anyone can tell me what's been done wrong here?

Thanks in advance.

JPB18

EDIT: Here's the script responsible for the torpedo movement (also changed the collision script):

 function FixedUpdate () {
 
     if ( isCalc != true)
     {
     //calc the flight time
         var time = travel_time(target.position, launched.position, speed);
         isCalc = true;
     }
     //fly!!!!
     StartCoroutine(flight(transform, launched.position, target.position, time));
             
         
         
 
 }
 
 //calculates the distance between the origin and the target
 
 function travel_time(target : Vector3, start : Vector3, speed : float) {
 
     var distance = Vector3.Distance(start, target);
     return distance/speed;    
 
 }
 
 //flight Coroutine
 function flight (ThisTransform : Transform, startPos : Vector3, endPos : Vector3, time : float)
 {
     var i : float = 0;
     var rate : float = 1/time * Time.deltaTime;
     
     while (i < 1)
     {
         i += rate;
         ThisTransform.position = Vector3.Lerp(startPos, endPos,i);
         yield;
     }
 
 
 }