As I said before the TT 46 is OK for hover or torque roll, check the video i posted on this thread.
I used 3 Hitec servos hs-81 mg in the ailerons and gas to reduce weight .
If you use heavier engines like os-61 you 'll get problems with the c.g. and will never get a good flat spin.

http://www.mega-file.net/video/view....5ccd6b9779cd6d