I was using the YS120 SF the first and least powerful version I'm told, although mine does have a newer head on it. (I have since sold the plane, going BIGGER!)
I was swingin an APC 16x6 and was hovering around 1/3 throttle.
You could accelerate strait up out of a hover and accelerate on any vertical line whenever you wanted, vertical was definately unlimited.
Any of the YS 120's (and 110's) would give you at least this much power.

I like the idea of mounting the enigne inverted.

I was using a the raido to match the two elevator servos, it worked fine and I didn't want to spend the $$ on the matchboxes.