The twist is the *****. I just won the very first fun-fly I have ever entered. I have a OS .50sx w/12.25x3.75 prop. I did mount it out further on the mounts than suggested. It seams to work great for me. I didn't have to add any weight to the plane either with the battery under the tank. My father who has ALWAYS loved war birds thinks he wants fun-fly/3D planes now. We will have to see how things continue with his trainer first.

Anyway it rocks and I LOVE it. I actually like it a lot more than my Funtana 90s/saito150. You can just fly it around in a 100'x100' box and have a ball all day.