I have a UCD with ST90 and moosecan. It weights 7.5lbs with 1100mH nicad battery. Hovers and pull out are great. I think a Saito 150 would definetly be a overkill. the only problem I have with the planes hovering ability is that I can't back it down in a hover. I can back other planes down, but I can't do it with the UCD. I only have about 10flights on it though. so I need more time. I can get about 1 1/2 torgue rolls out of it everytime. so fars its next to the best hovering plane I have flown.

Dave McDonald is using a St90 on his as well.

As for a OS61 It will fly it fine. But hovering would probably be limited.