A little more on stability and orientation...
Here is my ultra-micro Gee Bee Super Sportster. There was a time when this airplane was considered pretty much un-flyable as an R/C model. Too short coupled, too unstable. Even the real ones had their problems, killing a number of their pilots. In the R/C world, bigger is more stable, and a number of manufacturers attempted "giant scale" (1/4 scale, 1/3 scale) versions of this airplane, all to no avail.
Enter the modern gyro stabilized R/C airplane. Now even a tiny, 20" span, 4 ounce model can be made to fly well. Granted, it is still more of a handful than other designs, but it is no problem for anyone with some R/C stick time.
Back to orientation. Here is what the bottom of the Pitts looks like. The Ultimate shown above uses the big yellow stripe on the top of the top wing, and the lack of any stripe on the bottom of either wing, to the same affect. These stark visual differences between the top and bottom really, really help when you are watching from the outside and trying to control the airplane.
