I used a 13x13 APC Pattern prop on my Great Planes Minnow which is an almost identical plane. I used electric power and it ran about 11,000RPM or so. I don't know what kind of revs a OS 95AX would turn with that much pitch however. If it is too much load the motor will never get up on the pipe and reach max output.
http://www.youtube.com/watch?v=Y1ibJLdbFBw