APC (Landing Products) props are pretty much the industry standard, and most everything is compared to them. I have found that for a few applications there are some Master Airscrew (Windsor Propeller Co.) props that work great. I have to agree with V.G. that the larger props can "flex" and flatten out at higher RPM's. But who's to say that they don't work like an aeromatic prop, and regain their pitch at cruise speed? For this model, I would probably look at Master Airscrews last, unless I was determined to fly it with a three blade.