Curiously that green patch on the right wing was not put on there for decoration or maintaining orientation. That patch indicates the airplane probably was raced because that patch is a lane marker.

Virtually all pylon racing in the country these days no longer depends on the poles judges and lap timers to have to identify each of the four racers in an event. Instead two color stickon paper product is used. Your airplane is marked High green. There also would be Low Green, High Red and Low Red.

The high or low thing means the position of the marking when the airplane is in a left bank. This greatly simplified things as for example if an airplane marked Low Red cut a pylon he only needed to put check mark in the Low Red column and after the race the cuts are tallied.

Normally the markers are removed after a race the stickon is a paper product and if desired it is easily removed by pre soaking in lighter fluid. It appears the fellow also used some left over markers to help him see the fuselage.

Here is another example and this airplane is also marked High Green:

John