Yes, it is kind of a juggle deciding what size to make it. I settled on a disk about 18" in diameter that is about 4-5 feet from my face, just enough to block the sun while flying thru it horizontally. I don't move my feet or stance while I am flying a pattern so it is easy to keep my face in the shadow. The reason I like a smaller disk is you fly thru it quickly so the plane is not out of your sight for very long. If you are not going to fly thru the disk shadow, then a larger disk or plate would work great.

Woodie