Interesting. I have started using various ball attributes (0 spin, 1 spin, 0 distance, & 1 distance so far) to try to establish club distance. Taking into account the ball attributes, wind, elevation, and backspin applied I have been able to fairly accurately predict every club's distance except the 7 iron. The 7 iron is consistently 5 yards short under every circumstance I've tested. The clubs I'm testing are the Ping Rapture V2 Iron Set (Graphite) 25+. The club displays a 145 distance but I wonder if it's actual code sets the value at 140.