The Wirraway was pretty much based on the North American NA16 family of aircraft. The Boomerang, although heavily inspired by the Wirraway, was a totally new design. The story of Fred Davis who was CAC chief design engineer, is fascinating in itself. He was a German Jew who had worked for German & Japanese aircraft manufacturers but had emigrated to Australia after time in Germany & Japan. This esteemed gentleman had to report to Australian Police every fortnight whilst designing the countries front line fighter !!
Fantastic to see this aircraft flying again.