So hard to see this news! I spent many happy hours up there starting in the 70s...never met Brian officially, but sure I saw him around...terrible news. I can tell you after having built a Full scale DR.1, these airplanes do not fly like a C 172; visibility is bad and you are constantly holding rudder to keep turns coordinated and ball in middle of cage. If I were to do aerobatics in mine (which I currently don't) I would want to be around 5,000' or higher. RIP Brian.