Here's a less expensive alternative on the $5000 mercury CNC prop that puts an extra 8-10 mph on the new Mercury 300R V8 outboard. First of all, I have never bought a Hill Propeller in my entire life. I've never heard of any big numbers from their props. Mike Hill called me a couple weeks ago and asked if I'd be willing to test a new prop they just developed to run on the new 300R motors. I said sure, why not. I also told him that I would post all the results, positive or negative. Chad Hill sent me two 34" x !5.5" 5 blade over the hub cleavers to try on a 21 Liberator cat. One had 15 degree rake and the other was 20 degree. There was 15-20 mph winds and I was on my little 1.25 mile long test lake, so conditions were not ideal. Let me start out by saying the 20 degree sucked. Ran 99 and had to trim down to keep it off the limiter. Only ran 48 at 4000 rpm. Now on the other hand, The 15 degree prop was incredible. I ran it and the Mercury CNC back to back. The Mercury was faster by 4 100ths of a mph!! Both ran 111.10 mph on gps. You can see in the last pic that the trim was minimal. Now the price! Mercury's prop is $5000-$5500. This prop is $2380. I will be selling them for $2150 to your door. Cheapest 8-10 mph you'll ever see.