we had on interesting front brought up while chatting out at the field about scale trainers. we were saying how even though in real life they may be good doesnt nesecarily mean that they are good rc trainers. for example take a plane  with a wing area of 4'x40' which gives an area of 160 ft squared. if you scale it down to 1/4 scale you end up with wing dimensions of 1'x10' and a wing area of 10 ft squared. not exactly a 1/4 of the wing area now