Please bear with me. I am trying to get a grasp of what can be preserved and what must be changed when scaling down any airplane. DO things like : thrust line; CG location; CD location; CL location; decalage; tail moments; things like that. As a wing section is scaled down, say a Clark Y of 5' chord down, do the RNs change liniarly or exponentialy? Can you say there is a direct or inverse relationship of that curve to those components that must be changed? I have a feeling there are too many interrelationships to attempt to make it simple.