Get back some memory nine years ago.
Biplane have a great ability for aerobatics flight characteristics.
Vertigo give me the first experience of rolling plus circle many years ago.
If you regular pattern control the throttle add and reduce well, while the biplane rolling right it will automatically circle left.
It was great for 3D or 3A stunt flight.
Lots fun with the Vertigo.
Thanks for the Vertigo designer group.