I was at 2021 EAA Venture at Oshkosh and talked to AC Aero representative at their boot. He said that they were building RV-10, and it was going to fly sometime in the spring of 2022. It was going to have the RV10 – HAWK V4 engine on it. Well, I've never heard or seen that RV-10 flying. That 2021, the RV10 – HAWK V4 engine was on display, see attached picture.
This year I will be visiting EAA Air Venture at Oshkosh and will stop by the AC Aero boot again.