This is a radial-5 engine and runs nicely. However, the pistons rotate in the cylinders (doesn't impact engine) and ...

A simple radial 3 engine. Sounds vaguely like a rotary.

I used the I11 as a base (obviously)

Sounds a little like a rotary, makes about 210hp and revs to 9000rpm Original Engine made by Noffie: https://cata...