My favorite was an 11x7 MAS. It would haul with that prop. I also used 10x8 MAS with good performance. Of course, the SuperTigre is on ball bearings and has a HUGE carb for such a small engine. I don't know exactly how fast it would pull the plane, but it was much faster than scale. I usually ran her at half throttle, firewalling her for large loops. A fellow flyer thought she would do 90mph! If that SuperTigre was pulling her at 90, then I estimate that the RCV 60 is pulling her around 65-70. I do know one thing. My friend was flying a lighter plane with an OS 55AX and he couldn't catch me with the RCV 60. And the SuperTigre is a good deal faster than that! It is a screamer. I could go vertical for a very long way. Large loops and chandelles, no problem. A high yo-yo was a beautiful thing to watch.

Now I've been told by other modelers that, with SuperTigres, you either get a good one or a bad one. Mine is a good one. Once the carb is set, I hardly have to touch it. Just check before the first flight that you're not too lean, and haul! They are notorious for throwing mufflers. Use lock nuts for sure.

I, like you, really like this little plane. When this one is done, I will certainly buy another to replace it. I would recommend it to anyone. Just get that CG right from the start!