The older giant scale planes were built more to scale demensions, as far as wing span vs length and such. Add to that building techniques of the day and the planes were usually heavier. This created the higher wing loadings and of course with the taper of the caps wing it was going to tip stall first and easily..Hense this lead to alot of full garbage cans..A plane with a 84" W.S. is expected to be around 14-16lbs now with a good 50cc engine, those were looking at 18-20lbs. I remember flying a new 300s from a company at 80"W.S. and 80" length. It was a square plane designed like the real ones, it flew at 18lbs with a G-62, the other 300s were being built with the 300 wing just lowered on the fuse giving you 84" instead of 80" weights were about the same. I built a G.P. cap 21 with a Q-52 and it came in at 18lbs, wouldn't snap unless I said to, sold it because it was too docile for what I wanted at the time. Wish I had it back...
Man how things have changed over the last 10 yrs with these big boy's....