Carl,
I'm still up in the air about motors. kalog recommended looking at the 60 eflites also.
But the price on the 3520's look really appealing. I have 2 of them already looking for a home.
I have to do some checking as from what I understand there are at least 2 versions out there.
A 720 and a 590 kv version, and for some reason I have stuck in my mind that these that I have were advertised as 670 kv. I'm going to get some big old 3 blades, somewhere around 15 x10's and run the motors up. We'll see what happens. Probably going to run a 5 or 6 cell pack as I'm guessing around 50 amps from each motor and somewhere around 650-700 watts each. There's a real good forum on these over on RCG. I've been talking with some of the guys there. Real brains on these electric motors, me I'm like a babe in the woods, when they go into some of their conversations.