Fw: Cable Setup Re-Discovery

[Del Rykert]

Bob is a great asset to the list and pattern community as many are. Thanks
Bob.

        del

----- Original Message ----- 
From: Mike Austin
To: discussion at nsrca.org
Sent: Sunday, July 18, 2004 10:54 AM
Subject: Re: Cable Setup Re-Discovery


Bob, Thanks for pointing this out as I for one have been fighting a similar
situation with my Entropy. I've rechecked all my measurements and servo
connections but never thought this might be a problem.
BTW, the bearing change on my OS 140RX went smooth as a whissle using the
instructions on your web page.

Mike
  ----- Original Message ----- 
  From: Bob Pastorello
  To: NSRCA
  Sent: Saturday, July 17, 2004 5:52 PM
  Subject: Cable Setup Re-Discovery


  For the ten of us who AREN'T at the Nats, I thought I'd share a
re-discovery.  Still trimming on the Aries, and seemed to have differences
in inverted snap recoveries from upright, and hard inverted pushes were
rolling and not "feeling" the same as equally-hard Upright pulls...
      So - today - did some pretty serious measuring on the cable setup on
the elevators....here's what I found...(reminded me of the last time I
discovered this circa 1997-8)
      1.  Cable tension was different on each cable during the transition of
rotation of the servo, particularly near the full deflection endpoints.  I
*think* this is part due to a horizontal servo arm, rather than vertical,
but not sure.  Anyway...
      2.  At parts of the rotation/deflection, the cables were being pulled
against the rear edges of the cable guides.  Although they are exactly where
the plans/instructions refer to, they weren't long enough slots to permit
the cable to be under constant, direct tension to the servo arm.  Last time
I fought this, it was showing up the same place - snap recoveries and hard
pushes....

  After getting this all handled, all the cables are at least under the same
tension, and the changes in the exit guide length did affect the total
deflection tension....it was an interesting re-discovery.

  Tomorrow I'll find out if it was all in my imagination.
  If anyone has similar experience to recall and share, I would appreciate
the validation!

  Bob Pastorello
  rcaerobob at cox.net
  www.rcaerobats.net



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