Thanks Tim. I haven't tried the 17X8. I have tried the 17X10 and the 16X12. The airplane flies great but I just don't seem the have enough duration to get all the way through the Intermediate pattern. I'm getting better at converting my downline speed into momentum but it still cuts it too close for comfort. I tried a 14X12 on 8 cells but with that power combination you have to be real careful on the up lines and things were way too hot on landing. I'm between a rock and a hard place. I really don't want to convert it to gas or glow and replacing my 6 cell 5000's with 6000's or bigger is almost not an option. What battery are you guys running and what kind of duration are you getting. I built this airplane because I didn't want to run 10 cells.