BTW guys, don't get too focused on the prop pitch. The idea that the plane really shouldn't go faster than the prop pitch would predict overlooks the fact that our model industry prints whatever pitch they feel like on the props they create.

If you've ever had your hands on a prop pitch gauge you wonder how the model prop industry stays in business. You'd be amazed how many two blade props have two different blades. But that's not the point either. Not only are the tolerances pretty sloppy, but checking from one prop to the next shows differences, and from one line of props to another shows large differences, and from one brand to another. Seems everyone is lying right? Not at all. Everyone has labeled their prop subjectively. Their choices often aren't anything more than a WAG.

Don't get your knickers in a twist about your model's speed (no matter how accurately timed) being faster or slower than "it should have been" based on the number printed on that prop. It's nothing but advertising. Never has been anything more for us modelers.