I got one of these UCD 46 for christmas. I have the 60 size with an OS 91 FX and love it. I spent a good three hours today reading through this whole thread today and I still can't decide on what engine to use. My original plan was to rob my Zen 50 of it's OS 50 SX as it has been having a tank problem. From what I've read though the 50 may be a bit anemic in 3d. I also got a new YS 63 fro christmas but was planning to use it on my Burrito that is almost done covering. I don't have a Saito 72 but if I was going to buy an engine for this plane it would either be Saito 72 or another YS 63. I also have a Saito 91 in a GP Super Sportster that I really enjoy flying so I kinda hate to dismantle that one but it would be the best choice I have at the moment.

I'm leaning towards HS-225's all around with a 1450 5 cell rx pack. Lighter servos like these may make it pretty decent with the OS 50 on the TH muffler.
Any other bright ideas?
basmntdweller