http://www.bollyprops.com/clubmanintro.html

Not sure they make CF props that small. 18-6 is the smallest Ive run across in mejlik
I dont think that is what you want for a 91 anyway. CF props are usually a bit heavier and no prop on a 8+ lb plane with a 4 stroke 91 is going to turn it into a hovering machine
I have a 60 size Kaos that weighs about 7.75 lbs. It has good speed and very good vertical with the bolly clubman, but not unlimited with a saito 91