RE: .46 engine for Avistar
I have 2 Avistar's, one with an OS LA .40 and the other with a TT Pro .46. Both engines do well, but I can tell you that you will have a lot better experience with the TT .46. It's an excellent model and with the .46 you won't be sorry, and as krossk says above, it will fly very well at half throttle but give you all the power you need.
T.