ORIGINAL: JRFisher
I'm running a 12-4 on my old one and it really pulls great.
I have an apc 12x4 on my OS46fx and it does great with it too. I am prolly gonna try one on this new engine as well. It seems to be a good prop on 46 engines. I tried the 12.25x3.75 once on the tt46 and it was amazing the difference in vertical power.