Hi there. I got a CAP 232-46S and the model is awesome. Very lively and aerobatic. I put in a JETT 76-L (this is their 3-D engine meant for 46 sized planes). This engine develops more power than a YS-63 is a true delight - fantastic transition (as good or better than the YS), and can take props from 12x8 to 13x6, 13x8, 14x4 and even 14x6 (the transition is a little slower on the 14x6). I find the flight characteristics to be great with a 13x6.

Just to check I also bolted on an OS 46 AX with an 11x7 and later a 10x7. OK but not the same thing as the JETT.

I suggest you take a close look at the JETT. Not cheap, but the best never is!

BTW - the CAP46s is a true delight. Fantastic plane!

atul