Thanks for the update on the chart. I think I'll stick with my method and let the plane and engine decide what is best.If you really want to know how props differ from make to make and batch to batch from the same maker. Make a pitch gage along with measuring width, thickness and end to end. Heck thats a science in itself.Even moisture content enters into it when the props are made. I mean if one wants to get critical. Now a days most of the named makers have better quality control. I am only writing about wood props. Cannot comment on composite nor do I have any reason to use any,I like wood. I don't use a computer radio either. From what I've seen going to various events most of the pilots don't fly any better no matter if they used wood or composite. Now maybe the fellows that are sponsored pilots might require composite, end result is whatever works.