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Pullout is decent, but not quite like a rocketship when I strapped that DA to my H9 260. If you look around, you will find that most WH planes are 17 lbs plus though, and they all claim excellent pullout.

Colyn,
I would say it's probably enough for the rudder, but I am personally VERY happy with my 5955TG on my rudder. I would say that if you go with 5645, you can probably go with one per wing. If you don't want to do the mod and stick with 2 servos / wing, then 5625 will give you faster response. That's what I have.

Personally speaking, the most anoying aspect of the 2 servos per wing is my aileron differential mixing. I have to figure out how to do it on my 9C that I could use only 1 mix, instead of taking 4 mixes.`