I don't really fly much CL anymore however I want to do so. Planning some more Stunt flying next year. Now I was able to cut some trees and trim a half dozen more so that I can fly 65 ft. lines in my back yard. On the south side is my house garage and pool some additional 30 ft.+ from my circle. East side has a fence and several trees from 20 ft outside the circle plus a 20% of open space. North side is my open wire fence some 15 ft away with trees and another house 30 ft. + and back. Coming around to west side there are several trees lining the circle by 10-20 Ft. plus my 60 ft. long metal barn.
I have flown 1/2 a to .19 on up to 45' lines out there with no problems, but now, on 61' lines, things changed. The continuous and changing back-drop makes the airplane very difficult to focus on. I was truly taken by surprise on my first flights just yesterday, 10-30-'11. It contributed greatly to getting that dizzy feeling like when one first starts flying larger CL models.
Scary.

In addition my corrected to 20-20 vision was having trouble in defining the airplane with such a rapidly changing and many different colors of background.
I had to quit flying a pattern and just do inverted, lazy and vertical 8s, and such to keep oriented. Trying to do loops and such, it was totally calm, all I was doing was wobbling in my own turbulence.
This was a totally new learning experience. Right now I'm wondering just how it is going to be when I take a real stunter up out there. This trial was of course a Ringmaster and Fox 35 which I was running a tad rich, but it was still scary item. Oh well like getting dizzy a couple years ago after some 30+ years of no real CL, and I did so. It took a few days to again get rid of that old-time experience. I just kind of worry about how long I will need to get a hold on this background thing.