Glen: I appreciated the info. I got in there and while there was a bunch
of advertising for their "Master Blade" generator and comparison machine,
they had a bunch of good info. In spite of the fact that my blade
population is one set, I have used their concept of moment arms to re-do the
alignment and balancing of my blades. Instead of stringing the blades from
tip to tip, I now string between center of mass of each blade. Which with a
little thought was what I had hoped I was doing when I went from tip to tip.
I did find a small amount of difference in the chord wise c.g. of my blades
but little to no difference span wise.
Thanks again for your mentioning this source..

Stu
"Glenn" wrote in message
...
www.rwas.com.au

Lots of info on track and balance theory, problems and a new system to
correct blade mis-matches.
No commercial affiliation here, just pointing you to some good info.