Don: It turns out that this guy used the information in an article written
for our magazine by Larry Meidell , who according to Chadwick is a supremely
talented helicopter vibration analyst, and that technique does not require
phase angle information. Evidently the technique was originated, used and
written up by Russians who did not have access to an electronic balancer at
the time. I have used the same technique on some balancing that I have done
using instead of the dial indicator just the accelerometer without using any
of the phase angle information. It works. The technique involves a bit of
graphics and drawing circles. Our September 2006 issue of the Experimental
Helo magazine had this guys article and the original article by Meidell was
in the July 2005 issue, with a follow on article written by me on the
adaptation of the technique to a two rotor system which appeared in the Sept
2005 issue. If you have access to these issues of Experimental Helo, there
is a fairly complete story on the process.

--
Stuart Fields
Experimental Helo magazine
P. O. Box 1585
Inyokern, CA 93527
(760) 377-4478
(760) 408-9747 general and layout cell
(760) 608-1299 technical and advertising cell

www.vkss.com
www.experimentalhelo.com


"Don W" wrote in message
om...
Sounds neat. I'd like to hear how he did it. It
seems that the dial indicator would tell you how
good the balance was, but would not be very good
at telling you which side was heavier.

Don W.

Stuart & Kathryn Fields wrote:

We recently received an article for our magazine where the author
performed
a balance of his tail rotor on a bench using an electric motor and a
dial
indicator instead of an electronic balancer. I was impressed with his
thinking outside the box. If there is any interest in this out there, I
will see if the author would be willing to discuss his technique here.