While at the football field mentioned above, I decided to use the goal posts at each end of the field as an obstacle course.
I would fly through the center of the north goal, then exit by doing a steep bank around the left pole, then go through the center of the south goal post and exit by going around the right goal post, then do the opposite on the next pass.
That was a lot of fun but depth perception is the really hard part as you can imagine, especially while standing in the middle of the field 50 yards from each end.
To add even more to the challenge, there were trees about 15 yards beyond the north goal post and power lines about 20 yards beyond the south goal post.
This time there was a fair amount of wind but it only added to the challenge
I wouldn't even attempt doing this with any of my balsa planes, I don't mind patching a foamy but I'm sure it would totally destroy a balsa plane.