guys I know we are talking about a 1/4 Cub, but not all Cub's are built nor fly alike. I have a 1/4 scale Sig cub that weighs in around 19 pounds with a G38 on it. Yes I built it back many years ago and built it like a rock plus a lot of scale details. I also have a hanger 9 cub straight from the box with a G26 on the front and it is around 15 pounds. Yes both are almost the same outline as in shape, but the extra weight makes a big difference. Lets say you take two Balsa USA cubs, one scale out to the T and it is 19 pounds, next take the same plane with no details and it is 15 pounds. I would bet you a 20 would fly the 15 pound cub but would be a handful on the 19 pound cub.