I would stick with the 18x6 or 17x6 propeller.
While a 15x14 would be good on a pattern ship, it will be a dog on your Cap
ORIGINAL: rrader
I'm putting together a Hanger Nine 1/4 scale Cap 232 ARF. I am putting a Saito 180 engine on it. My type of flying is sport, nothing wild, but occasionally try a knife edge, roll, or loop. The book lists an 18x6 prop for scale, 16x8 for sport and a 15x14 for acrobatics. Any thoughts on this "correct" prop to use would be appreciated..