The two-stroke engines never sound right. I prefer the Moki radial engine sound.
https://www.youtube.com/watch?v=qPsHhWALh-w
https://youtu.be/FFrm4gyW0PA?t=85
I think it would sound great with four-stroke glow engines
but the fuel costs would be over the top. Carl sure builds
fantastic models. I got to meet him a few years ago at a
fly-in at Muncie, In. Indiana Warbirds I think, a great
modeler and a nice guy.
Mike
Love that radial sound!