I talked a buddy into testing one of my props on his plane the other day. We both have Tiger60s with OS75AXs on them. I tested a small mountain of props on mine and fly it with a 3 blade now. Best all round performance plus it's a bit quiter. His Tiger was distinctly loud for any model, and the goal was to actually see through a back to back test how much quieter the 3blade could make his plane.

After the two test flights, I was pulling my prop and he wanted to see the specs on it. When he saw what was written/molded on one blade he was really puzzled.

I started to explain, but as I usually do, I went a bit too, shall I say, wordy. Yeah, sometimes I carry on a bit too much...... When I got to the description covering the efficiency and performance of props as a function of their aspect ratio, I think I lost him. Or maybe it was that it'd gotten dark and we'd both missed supper......

What was hard to explain was why a prop with 8-pitch printed on it landed like a 4" pitch and had a top end like a 6" pitch and climbed like it had a constant speed hub (like fullscale's have).

Anybody care to try and put that into 25 words or less?

He saw and personally experienced what that 8" pitch prop did. It "flew in the face" of all the conventional wisdom he's absorbed from some of our field experts in the one summer he's been with us. And almost every bit of those "rules of thumb" were trashed by what he experienced. I tried to tell him that in theory, practice and theory are the same, but in practice usually aren't. But the problem with that is the 3blade in question actually DID perform within theory too.

25 words or less?????