The FAA regulation on impact force, "...requires an impact force of more than 50 pounds to separate the suspended payload from the balloon" is causing me some confusion. From what I understand, if the rope requires more than 50lb to break, then we have to register our flight beforehand. However, this notion of impact force isn't quite clear to me. If I fly a balloon with parachute cables connecting the payloads to the balloon, like recommended in the cord and cables tutorial, which are rated to potentially hundreds of pounds, does that mean I need to contact the FAA? I.e. is the rating of the line equivalent to the maximum impact force required to break it? If I fly a balloon with cables rated for 100lbs, I would have 100>50, and thus have to register my flight? Line ratings are usually specifying the maximum static weight on a line, does that tell me what I need for impact force?