The first time I answered your question it was for a Zenoah G23. Then I saw that wasn't what you asked for and wrote the second reply, which you have read.

Okay, now for the G20/23 .23 CID glow engine. It just so happens that I used to fly one on several models. It was a really sweet engine for its day, which was the early Seventies onward.

I used a 9x4 to a 10x4, depending on the model, of course. Just pay attention to the load of the prop versus the amount of nitro in the fuel. This sweet little engine was meant to run well on 0 to 5% nitromethane.


Ed Cregger