this is not much help but one of my flying buddies bought one of those "fly swallows" when they first came out. i later asked him how was the the 1st flight and he exclaimed "nightmarish".....he claimed the cg suggested by the manuel was not even close . he also told me that the control surface throws were critical. after some hair raising trial and error he finally got it balanced and now it flys good. he has novi rossi tuned pipe engine on it and it is fast!.