Brian,

For Pattern? I don't know that.... IMAC of course is a totally different matter

The OS33GT just became available last Winter. It's better than anything else I've worked with in the 30cc class engines. It's turning the same prop as the YS175 at similar rpm, throughout the throttle range. Except, it's gasoline power. It is also a couple ounces lighter than the YS CDI version....

Let me suggest you try it first before poo-pooing it.