Hey Stone,
For a trainer you want as much thrust as you can get and you want it right now. A big diameter, low pitch prop is what you're looking for
I have a H9 Arrow with an OS 46AX. It is very similar to your setup. I have used MAS 10x6, 11x6, 11x4 and APC 12.25 x 3.75. The APC has the best thrust and will climb forever, it isn't quite as fast as the 6 pitch props though. The 11x6 takes a while to spin up. The 11x4 MAS is a little small and tends to over-rev. I would try the 11.5 x 4 or buy an APC 12.25x3.75.
Chris
ORIGINAL: StoneDeaf
I have three props now and I have not flown my plane yet. I just finished building it. I have a 11x6, 10x6, and 11.5x4. Which of these three would be good to start out on or should I buy another one?
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Flyn' High, Real High