carrell,

Thanks for the input. Physically, the Tower Trainer 60 is about the same size as my Nexstar which flies fine with .46 2S, but the TT weighs about a lb. more. So the question is, does the .61 4S have more oomph than the .46 to compensate for this extra weight, and now I have both "yeses" and "nos."

Many things in life aren't black and white, in this hobby nothing seems to be .

P.S. if you are wondering why I am looking for another trainer if I have a Nexstar, it is sitting on the shelf awaiting some TLC after, ehm, a little mishap a little while ago.