its a shame that the hub and blade on the APC 14x6 is such a step up from the 13x6 else I think it would suit the YS better... I might try a narrow 14x5... thats a lot slimmer and smaller hub.... I have got shed loads of forward speed with the YS / 13x6 set up... almost more than I need really.

I also think that when using a power house like this on the C50 there might be need for an additional tad of right thrust over what is already built in.... it depends what prop you use..