O.K., the way I understand what bluestratos is saying is that when you use the tac the rpm's will keep going up, as you turn the high end leaner, until you hit lean, or max rpm's, then if you keep going leaner the rpm's will start to drop. So once you find the high rpm end then go back a couple hundred and you should be real close if not good. This makes since to me. Is this right?

I am not trying to get max rpm's from all props, I am sorry if that is how it sounds. I am just trying to find a better way for me to set my high end on my engines. As for props I am still using what that manuel says to use for that engine as far as the break-in prop and then once I have several flights on it I will go one size bigger. If I am still way off I will just stick with making sure I see smoke while flying until I can get back with the experienced flyer's in person.

As far as just going by ear, well I can hear however I do have a good amount of hearing lose in one ear. Going by what others tell me, I hear things different than others so I am just trying to find another method if their is one. Or I should say if I can understand this.