I just ordered the Katana V2 70 wa hoo! Does it require one or two elevator servos?

One. I used the Hitec 5925.

One. The elevator is the thingy in the back that flaps up and down when you torque roll.

ha ha! I'll keep that in mind! I got Futaba 9402 coreless servos. 89 oz at 4.8 in .13 sec trans. Should be good! I'm also being a "bad boy" and using an OS 120 AX. way too much, I know, but I remember this Flip 3D I had (40 size) with an os 91fx on it. It had about 960 squares of area and so it still flew like a feather. But on take off, you would just kind of hit the throttle and about the time it was spooled back off and it would be like 20 feet in the air. It was so cool! I think I might be looking at the same kind of animal here, but with way better 3D. the few extra oz over a 90 won't matter with its large area. And fellas, this one's gonna rock!

Rock on!