ORIGINAL: Kostas1
I took will order my Revolver ARF 40 size once i'' be back from my holidays....
I too will install a 55AX...and APC 11x6 or 10x8!
It will be hot ....... very hottt....
I think you'll find those props too small. At the very least you won't get anywhere near the speed a 12x7 will yield. Some guys in my club tried 11x6 and smaller, none of them liked it. You'll be at 14000rpm on the ground and then run out of revs in the air, not good for an engine.
Of course, if you're into hovering etc then use whatever works....I don't pretend to be an expert on that stuff.