krayzc, Don't hate my prop because it's beautiful... no, I haven't run it on my 160 yet, it's for test flights before I put on the Mejzlik, just as Mike did. Here's what I posted on the engines forum:

An engineer will have to prove otherwise, but I've compared a Pro Zinger to a standard one and the airfoils looked the same. The pro just has the tips cut and the blade just a hair narrower. On my engine, the pro over revved and pulled like crap, the standard had more thrust. My conclusion (totally non scientific) is the pro spins higher rpms because it is grabbing less air. Hate my Pro Zinger. Mejzlik...great!

At my field there are a half dozen of us with 160's and we've run all kinds of props and the consensus is the Mejzlik 18-8 has the most thrust without sacrificing too much speed for ballistic type vertical on planes in the 11-12 lb range. (Just kills the Pro Zinger)