As Thud Driver said, scale jets can have wing loadings much higher than the 49 ozs/ sq. ft. you are talking about. We are flying RC jets as aerodynamic test models and we have a PCM Models L1011 that we are flying at over 100 ozs/sq. ft. wet, and it flys fine. the dynamically scaled 757 model in the picture will fly in 3 months or so with a wing loading of 145 ozs/sq. ft.

Bob