ORIGINAL: jaka

Hi!
Don't say that!
I was also thinking so, but a newbie came along a few years ago with his ASP .40 (Same as a Kyosho .40 GX) in a Kyosho ''Calmato ,high winged trainer, and low and behold, he had a 12x6 APC on. I was very reluctant to help him fly his plane with that big prop, telling him that for .40 engines 11x6 props were a better choice.
But when I started the engine and saw with my own eyes that the engine could in fact turn that big prop with outhority I was convinced. He used 16% nitro and 15 % all synthetic oil.

That's why I today race succesfully with the same kind of engine in Q-500 pylon. My Kyosho GX.40prop turns a 10x6 RAM (which is the best prop together with the new Graupner 10x6 ''Cam prop'' with up swept tips)at 14600-14800 rpm using FAI fuel.
We use 10x6 props here in Sweden in Q-500 racing and FAI fuel.