i don't have any idea,gree-grose recomended it, we fly at he same field, he has one on a v-max .46 and it will hang on the prop with no problem, and i tried a 10/6 just to see what it would do, all it done was climb and trimed it out and it still climb,and was going to fast for tricks.(for me anyway, been flying for 3 months).
i'll get with ghee and see what rpm he's geting on his vmax.

keepem hovering