So, I take it scaling is not legal in SPA? Now that would open the door to a lot of different designs being built, I'd bet. Any design from the era could be enlarged to suit the .60s and .91s of today. IMO, scaling does not change the character of a design too much as long as the proportions are kept original. But, I guess it would simply be too time consuming to evaluate scaled planes to determine if the proportions were accurate. What would be the ideal span/area of a Kaos scaled to match a .91 4-stroke?