im thinking he's straight inboard. either way, im thinking base line pitch will be around 15-17 inches. diameter about 15. our SR which is underpowered cruised 20 mph at 3500 and WOT ran 29.9 mph at 4600 running 14.5X17 props. we stepped up to 14.5x19 and now cruise 20 mph at 3000 and 33 mph at 4400