Javelin II Pattern airplane with a YS FZ63-S..... the engine call for a 11-9, 12-7 or a 13-5
I have both APC and Zinger Wood with these size props.

Would the 11-9 prop be the best pick?

from what I have read in forums it seems best to stay away from large diameter low pitch props for Pattern flying.

I am new to Pattern and this will be the first 4 stroke engine that I will be running. (I have always used 2 stokes since I began flying)