public override void OnStart(StartState state)
 {
     if (state != StartState.Editor)
     {
         if (this.part.vessel != null)
         {
             part.force_activate();
             ParkPosition = vessel.transform.position;
             SetAltitudeToCurrent();
             instance = this;
         }
     }
 }
 public void OnDestroy()
 {
     instance = null;
 }