The thing to remember about the prop pitch marked on our model airplane props is that there isn't a certification process anywhere that verifies the pitch is correct or true or anything.

The numbers on the prop are SWAGs by the manufacturer. There's a good probability that different mfg's have totally different ways the come up with the pitch number they choose to print on them babies.

Want proof? Next time you're in a LHS compare a couple with the same dia/pitch numbers printed on 'em from different mfgs. You'll see that for all of our discussion, including all the theories right down to the math, the discussion doesn't match the hardware we got to apply that theory to.

I've snatched up every prop pitch gauge I've heard about over the years. Every one shows the same thing. Our model prop pitch numbers aren't really reliable at all. And if any of them were produced by processes that were supposed to produce predictable results to match some formulas, then they've not done a very good job of it. It's not a surprise to discover one blade doesn't match the other on the same prop.

Theory is nice to know. But you gotta have a better matchup from what we have available for the theory to come close to applying.