So in the case that only ground and signal are sent down the lines, I guess you have to use two batteries - one in the handle for the servo driver and one in the model for the actual servo?
Of course I realize this would only work for throttle control, needing something a little more sophisticated for 2 or more functions.
Thanks for the info on model sizes, I guess now that my thoughts around
building the Sig Ryan STA for CL scale are reasonable then.