Franklin and Topgunn, I am glad that the two of you joined in on this conversation. It has certainly helped me to understand the perspectives in what we may or may not perceive as accurate while flying our models. I have for several years been adjusting my flying based on perception. A couple examples of this would be when establishing a 45 degree upline at the end of the aerobatic box. If it were a true 45 degrees it would actually appear to be shallow so in reality it is actually closer to 50-55 degrees. Another example is an upline at center if in closer then 100 yards ( and of course model size defendant). The line has to fade slightly away because if the upline is perfectly vertical it will appear to be coming in. It's easy to understand that when we are flying in front of judges whether it be flying accurate aerobatic shapes or trying to create realism of speed that we need to account for the judges perspective. Thank you both for turning this into a productive thread.