there is only one servo for the ailerons (you cannot adjust aileron differential, or flap/ elevator mix, etc.). i'm probably going to modify it to take two aileron servos (one for each side).

you will also want to enlarge the ailerons. the stock ones are surprisingly small. roll rates can still be ok with the stock ones as long as you keep the cg a little aft. but on downlines with engine at idle, it's very unresponsive. mine are enlarged about 20% and it flies MUCH better. i've also enlarged the elevator about 40%. i've enlarged the rudder also but it probably was not neccessary, as it's already very effective as-is.

overall a very good bipe. great quality. the only complaint i have is that it doesnt track as straight as i'd like, esp. on uplines. the tail is way too short in my opinion. other ultimates from other manufactures are always made with the fuse a few inches longer than the wingspan. this one is 2 inches shorter, which causes it to be too "twitchy", esp on the pitch axis.

it will barely hover, but it takes a lot of effort. definitely not a "3d plane". but it does biplane type aerobatics great (spins, tumbles, point rolls, knife edge, etc.)

with a magnum .46 2 stroke and 11x5 prop, it's got power to spare. with a 10x6 it's faster and tracks a bit better, but i like slow aerobatics so i'm sticking with the 11x5.

brian