Here is a pic of my Frenzy 100 with a OS .91 inverted on it. Before I put the cowl on I was flight testing it and breaking in the engine good. I flew it like that for a year or so, then I converted it to electric instead. it needed a little more power, but I didn't have a Saito 1.25 at the time, but I did have a powerful big brushless motor though.