Message-Id: <199906121522.LAA17350@smtp13.bellglobal.com>
From: "Ian B. Crowe" <ian.crowe@sympatico.ca>
To: "Marvin Kaye" <lancair.list@olsusa.com>
Subject: Control Surface Balancing.
Date: Sat, 12 Jun 1999 11:30:39 -0400
Mime-Version: 1.0

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Dana, I did my elevators almost the same way that you did and I put the
half of the control arm in place.  I figured that it was all part of the
system.  I did not worry about the push rods etc here or for that matter on
the ailerons either.

Did you have a PERFECTLY free moving elevator when the attachment bolts are
snugged down?  My problem is that when the elevator is installed with only
loose bolts in the hinge points I have much less resistance to movement
than with the actual bolts installed and tightened, which was the situation
when I balanced the elevators originally.My elevators were free enough to
always return to slightly above the mid point when I had finished the
balance so I figured they were balanced.  I did not try them at that time
with the loose bolts.  I figure that it would be virtually impossible to
get the friction totally out of the system once it is tightened.  We are
not dealing with high tolerance machined parts but composite structures.

Can any of our more technical brethren in the aerodynamic field give us
some pointers as to what we are trying to achieve by balancing and to what
degree of balance we should aspire to?

Regards


Ian Crowe.

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