[NSRCA-discussion] Servo question

[chris moon]

Hi Ed:

That was my first thought that I activated or changed some mixing, but
I could not find any difference by moving switches and went in and
checked all of my mix settings.  I think now that it must have been
bumped or jarred somehow to change the pot setting or else cause some
mechanical change in the pressed together parts.  I just assumed though
that if you hit the elevator hard enough, the first thing to fail would
be one of the tiny plastic servo gear teeth but that might not be
true.  Anyways, the servo is on its way to Horizon now and I hope they
can find and report what is out of tolerance with the servo now.



Chris



Ed Alt wrote:

  Chris:

Any chance that you didn't disable the lever/knob/switch associated
with the aux channel that you mix the elevator into for the 2nd
elevator servo?

 

Ed

  

  

  

  

  
  

From: cjm767driver at hotmail.com

To: nsrca-discussion at lists.nsrca.org

Date: Sat, 5 Jul 2008 12:47:55 -0500

Subject: [NSRCA-discussion] Servo question

  

  
  
Ok, here is a brain teaser for you experts.

  

On Sunday 2 weeks ago I went out flying maybe 4-5 flights. All was 

fine. When I got to the flying site on Friday for the Lake City 

contest, I made a practice flight and the plane was climbing like mad. 

I got it down and found that 1 of the elevator halves was about 3/8" up
  

from the other. Before the flight, I checked the operation of the 

elevators and they were moving correctly but I don't remember 

specifically if I paid any attention to if they were centered 

perfectly. Now, nothing was changed between the the last time I flew 

and this flight. The transmitter was on the right model. The linkage 

had not slipped, nor had the control horn bent. The control surface 

showed no sign of trauma from a severe bump possibly causing a stripped
  

gear. The servo (JR 3421sa) was functioning 100% normally it was just 

the center had changed on it's own. I removed the servo arm (alum - not
  

stripped either) and moved it one spline and adjusted the sub trim 

slightly and flew a few test flights and the contest with no problems. 

Now at home, I removed the servo to send it back and inspected it and 

found nothing abnormal. The gears all look fine. Here is what I have 

eliminated:

  

servo arm - not stripped

servo gears - not stripped

pushrod and linkage - no play and not slipped on the clevis threads

transmitter - correct model selected and could not be elevator pot in 

transmitter since it did not affect the other elevator servo's centering

  

I am sending it back for a check up but just was wondering if anyone
has 

had any similar experience ever or if they have any possible causes.

  

Thanks

  

Chris

  

  

  

  

  

  

  
  

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