Quoted From KLFER:
I did see that. And yes there are fun I have perfected my method in building them. Most problems are the owners, they don’t understand them or how they work. It is a 4 stroke engine just does all 4 stokes in 1 revolution, which is why it make so much power for being so small.
That and they have 1/2 the friction of a piston driven engine. Just not my cup of tea. I do like the way they look though.