I need some advice on what to do. I have a volvo penta 270 outdrive with the short hub propeller shaft on it. It's mated with a merc 260. My prop is a 15 inch by 19 pitch. I can't judge wide open throttle because it would redline my engine. From what I can tell this is the biggest prop I can fit on that hub. Any one have any suggestions in my need for speed? Thanks,<br />Gerry