I've had 3 UCD46. All have had the Saito 82. I fly at 4800' elevation. I use a APC 14x4W prop. I use 30% heli fuel. This is a great combination. It will "rocket" out of a hover if you want. More than enough power anywhere you want it. I love these planes but I keep crashing them because I try to hard to do stuff I'm not capable of. I have another on the way right now. The plane is so easy to fly. I have my CG at 5 5/8". It hovers well there and does wonderful flat spins, especially inverted. The Saito will fly for 15 minutes on a 10 oz tank of fuel with reserve left. I love this combo. I try to build the plane as light as possible. My last one weighed 5 lbs 14 oz with NiHD battery, 1350mA, and digital servos, HS5625 in the tail and HS645 on the ailerons. I have found this plane is easy to develop flutter on the surfaces if you're not careful. My answer is to use high torque servos and I use carbon fiber push rods from Cental Hobbies. This really stiffens the controls and I have had any flutter problems since I've went to this set up. But you still need to MANAGE the throttle. You cannot fly these planes fast. They will not take it. Anyways, Saito 82 with UCD46, doesn't get any better than this.
Thanks,
Barry