RE: Kangke Waco Biplane
How about a 170 Radial?
It will fit in the cowl and look great doing it.
I have one I am putting in my Kangke Monocoupe. There is a test in the Review section of RCU and they have a video of the Monocoupe with th Radial flying. It pulls it around with authority.
Just a thought.
Bob