RE: super skybolt engine size
The airplane is a ball to fly with a 60.
Like I mentioned, the OS61 on my Skybolt was brandnew, just out of the box. The engine reads like an OS46AX on steroids. It is supposed to breakin the same way. Basically you run a couple of tanks through it on the ground while cycling the needle setting from a peak setting (to heat it up) to a rich setting (to cool it right back down). I did that, and it broke in just like my 46AXs have done. They seem ready to go after about 4 or 5 of those cycles, but I figure it's no problem to do what OS suggests, and it isn't.
The OS61 pulled like a bull with the 13X6 I had on it. The prop is a TopFlite wood. When I checked it for balance, it was already. I painted white and red strips on the tips and I got a feeling it's going to be a marriage made in heaven.
Only thing that wasn't perfect today was the wind and the sound level the Slimline Pitts muffler puts out. It's a tad bit loud. At what I paid for that muffler, I best get used to it. I'm running 10% fuel and got no complaints there. An IMAC airplane was up during my 3rd flight and the Skybolt blew by him like he was big and heavy..... hhmmmmm.... he was big and heavy....... whatever.......