RE: need help with sundowner 50
We have a racing class in our area that uses the Sundowner 50 with the TT Pro .46 and it is a good combination, not the fastest but makes for some very competitive racing. We are using an APC 10X7 or 10X6 depending on where we fly, (elevation wise). As still4given says, you will be surprised. The 12X6 and the 10X8 are going to be a little too much prop for the engine. You should be able to get at least 14,000, (after it is broken in), out of it with whatever prop you use.
Let us know what happens...
T.