Actually if you want some 3D ability I thin the APC 12,25 x 3,75 is best on a two stroke, like the I 53

With the higher rpm it pulls enough to stop slow speed stall, and give reasonable forward speed for smooth aero, but also give you good blade depth for 3D


For what its worth IH is running a deal on a 3010 outfit for the C50 and they do the props too !