Mort,
What have you come up with when you worked it out yourself? Were you at Susquehanna on Friday?
I had one of my jumpers figure it up a few years ago during physics class. It was something like 2″ distance for every inch of “lowness”. I think this was based on like a 9m/s takeoff and a 20degree takeoff. I think the result she came up with is close at least. And yes, we are always at Susquehanna.