var projectile : Rigidbody;
var speed = 20;

function Update () {
{
if (Input.GetButtonDown ("G"))
var instantiatedProjectile : Rigidbody = Instantiate( projectile, transform.postion, transform.rotation);
instantiatedProjectile.velocity = transform.TransformDirection(Vector3( 0, 0, speed));
Physics.IgnoreCollision( instantiatedProjectile.collider, transform.root.collider);
}
}