My experience instructing tells me that 6 inches of pitch is much more than you need, and less pitch often helps control landings better. I generally use 11x5, or even 11x4 props for trainers with 40 size engines. For a three blade prop I guess 11x4 or 10x5 would be appropriate, but I don't know what yours is.

A thread on the subject of three vs two blades really surprised me because tests showed no difference in efficiency. I always assumed the same as Rodney, that the three blade prop would be a little less efficient. In any case, even if it is a little less efficient, you will have more power than you need. Nice airplane!

Jim