Here is a theoretical 12s modification I did to Dimitri's Align 550e using the specs for KDE's KDE550XF-565kv motor and an 8.6 ratio.... governed to 2550hs. Seems to fly nicely, especially for a heavy bird. Feel free to comment if you think it's a realistic representation or not. I'm thinking of doing this to my real 550 so positive & negative comments will be useful and may prevent a costly mistake. Thanks & enjoy!