Jim,

The 220hp Continental and Jacobs engines have 7 cylinders while the 220hp Lycomings and 450/600hp Pratts have nine. You might be thinking about the 5 cylinder Kinner engines that were on the little Ryan monoplane trainers.

I have trouble ignoring a Stearman too. I can watch one working a farmer's field all day. A good duster pilot makes it look like a fine ballet.

Harvey