Add relative force to other object

Hi there,

i'm trying to make fans

( like in the game called 'Cut the Rope' )

My add force script:

 public float forceAmount = 10.0f;
 
 void OnTriggerStay(Collider other)
 {
     other.rigidbody.AddRelativeForce(Vector3.up * forceAmount);
 //other.transform.eulerAngles = transform.eulerAngles;
 }

I have 2 problems:

1. My AddRelativeForce don't depends on fan rotation. Balloon go always up in the world space.

2. Balloon should have new rotation depends on 2 or 3 forces applied.