Some aviation eras scale better than others. As engine power density and aerodynamic science improved, full size planes became faster with higher wing loads - both detrimental to closing the the Reynolds number gap.

The World War I era offers the scale modeler an opportunity to have the best of both worlds. The full size planes of the era were underpowered and over-winged, yet the basic theory of flight control was advanced enough that the models respond predictably to pilot inputs. R/C planes are pretty easy to overpower so flying the model a bit fast on a slightly tweaked airfoil gets you about as close to the real thing as you can get in my opinion. The full size planes were constructed largely of wood and fabric which is an added plus for those wishing for the ultimate in scale fidelity.

Balsa USA offer some nice kits of subjects from this era and although they take a few too many liberties, no one I've talked to has a bad word to say about their flying habits. Proctor Enterprises make some of the nicest R/C kits ever made including scale airfoils, machined turnbuckles and even warping wings in the case of the Fokker Eindecker. They fly great too!