I have the OS .91 in my UCD and it will certainly hover. Mine hovers at about 1/2 to 2/3 throttle with an APC 15X6 prop. My UCD is a little heavy (8.2 lbs) largely because of all the tail weight I had to add. I would like it to rocket out of a hover, but it won't quite do that. Still, vertical (for IMAC type maneuvers) is almost limitless. I was actually going to try an APC 16X4 if I can get my hands on one.