Hello Otter........I have as YS120 on a 1/4 scale clipped wing Cub. Does really well with scale flying. You know with all that wing and drag. It looks real. With my experience YS engines give you lots of power quick. Winds up really fast. Also YS engines have the highest horse power in their size. They are a bit pricey but they have saved several planes with their immediate response to the throttle. They were designed for pattern flyer's. Constant power and pull if you know what I mean.

The plane that gets my heart throbbing is my Tiger 60 with a YS 140.