ORIGINAL: ChuckW
Will it fly it? I'm sure it will fly the plane just fine and you'd probably be happy with it for a while. You'll likely finding yourself wanting a little more power at some point though.
I really agree with this. If you're going to spend $150 on an engine that's really designed as a monster powerhouse for a .40 size plane (hence the same mounting as the 46AX) why not spend a few extra $$$ and get an engine that's made for a 60 size plane? 61FX is $155, 75AX is $199. (75AX is the monster powerhouse for the .60 size planes, hence the same mounting as the .61FX). I'm sure you'd be happy you did when it's all said and done.
Is there a good reason to go with the 55AX over the 61FX? Even with the improvements in power, etc. the 61 still is rated to put out over 10% more power than the 55AX.
If you read reviews on planes in the 'user reviews' section of this web site, you will see so many reviews where the poster wished he had a more powerful engine. I'd hate for you to spend $150 and be wishing you had more.