RE: What size is this engine?
The engine dates from the Early 50's.
I used to own one when I was a kid. I never wore it out. I flew it in control line for many years. 9 X 6 prop
The engine actually belonged to my dad. He bought it in 1952. He lost interest and I inherited the engine
It was ideal for control line in the 50's
You need 20% all castor oil fuel with 5% nitro for this engine