Ewwwwwwwwww.......that's gonna be tough to replicate the sound of a 12cylinder Merlin (?) with a single cylinder r/c engine.

Maybe a big two cylinder gas job with open exhaust stacks would get close. Then..you're gonna get kicked out of the club for busting the noise rules.

You're trying to replicate the sound of a violin by using a tuba.

It isn't going to be authentic....period.

Wish I had a better answer, but...

Good Luck!

'race