Originally Posted by turboparker
As AP noted - it's not AS3X. Rather, it is the nature of the airframe.
The full-scale Gee Bee was designed as a purebred racer. Aerobatic performance was not a consideration. The UMX Gee Bee is the first scale-outline Gee Bee in this size. It was designed to be a scale plane with the basic personality of the full-scale ship - but with the infamous nasty side greatly subdued. It was not designed to be a great aerobatic performer.
And yet, the full Gee Bee R-2 replica in the hands of Delmar Benjamin was a pretty incredible aerobatic airshow performer, for many years.
Certainly not an Extra 300, but it does almost anything but snaps and tumbles (would do those as well, but with a little too much enthusiasm, I predict.) Delmar usually did a lovely climbing in knife edge at airshows in the Gee Bee.