Awhile back I was trying a few new props on a very tried and true model of mine.

And for the heck of it, I tried an 8" pitch prop in spite of the fact the model flew just about every brand of 6" I could find. Since you adjust your engine to the prop, and whatever rpm the engine settles for will decide the power output, and a torque curve is only so long, I really didn't expect the 8" was going to work. And I was expecting that the airplane just might not land as slowly as before, since the idle was about the same with the 6"s and that 8". And 7" pitch props had not been very good.

But that 8" worked better in the air than any of the 6" had. And approach speed was just as slow with the 8" as with the 6"s. And the idle rpm's tached within a couple hundreds.

Did the mfg of the 8" prop lie? or did they make a mistake? I'm guessing their test process tripped them up. I frankly didn't care a bit, why. It's happened before.

I've not put that magic prop on the pitch gauge to see what that will tell. That gauge hasn't been out of the drawer in years. I'm flying R/C now and for most of it, the details don't matter as much. So the gauge probably won't be out ever again. Unless I start racing, that is. That's about the only part of R/C I can see might benefit from that attention to detail. whatever.............

Don't bet on the pitch numbers.