Matt,
It will fly it, but more at sport levels than pattern/3d. Propped for anything over 40 amps and effeciency becomes a loss (84% at 40 amps). This motor can handle 60 amp bursts, but when I overamp outside of the max effeciency rating, it always costs me a hot motor.

As the cell count goes up, the prop must come down. The positive is that this is not a draggy airframe and one could probably get away with a 16 or 17" prop (which is what I feel is where it might be).

I agree that using a 9S 3200 over a 9s2p 4000 would work to keep the weight down. And the loss of 800mah isnt that drastic. However..for every Yeng there is a Yang..obtaining CG might be a Yang in the rear

I have a friend running this motor in an 7 pound Sig Kadet and it does well. My personal preference is that I wouldnt run it in anything over an 8 pound plane depending on the performance that I wanted (scale plane, I might go to 9 pounds). For anything over 8 pounds, I look at the next size motor (5320). Especially when someone wants to hover a 10-11 pound aircraft. I just dont feel that it would provide the performance he is looking for.

-Mike