I just put a YS .63 s on my ucd .46. To get more weight to the front, I ended up putting the 6v battery under the tank and as close to the firewall as possible. This should be plenty of motor for pulling out of a hover but not sure about authority. The motor is swinging a 14x4W at about 10,200rpm with wildcat ys 20/20 and an o.s. #f plug.