U/C models have to drag those control lines round and round. R/C models do not. I flew a Ringmaster with a Super Tigre G-30 2.5 cc diesel in the late 1950's into the early 1960's. Full size Ringmaster but construction lightened up some. Top and bottom wing spars at the high point and much smaller leading edge. Fuse also lightened up. Later a full size flite Streak on an O. S. 15 diesel. Still later a Flite Streak Jr. with a Wbra Mach II diesel. The Webra was also used in one of the Veco U/C models. I do not remember which one. All flew well. Jack