[NSRCA-discussion] Futaba 14MZ glitch

[JShulman]

I had this glitch at the Nats in my Tx and thought I was flying to far out
as I only noticed on occasion in my rollers. I sent it in and was told that
there was an early run of 14's that seem to see this issue once in a while.
Send it in and they will change it out.

Regards,
Jason
www.jasonshulman.com
www.shulmanaviation.com
www.composite-arf.com

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of James Oddino
  Sent: Tuesday, February 12, 2008 11:56 PM
  To: adriancwong at earthlink.net; NSRCA Mailing List
  Subject: Re: [NSRCA-discussion] Futaba 14MZ glitch


  Hi Adrian,


  That doesn't sound good for a system that young.  My 9ZAP finally was
getting old but I had it for over 15 years.
  The sticks still use pots like we've used forever.  I believe the
confusion started when Futaba started calling them encoders.  A friend of
mine had his replaced and what they took out looked like ordinary pots.  I
don't know if he had experienced any twitches but I'll ask him.
  I can't think of any reason the 14MZ should be more susceptible but I
believe it does use different pots than other Futaba transmitters.  I'm sure
the service folks will replace them but it would be nice to know if they are
replacing with the same old stuff or have a better replacement.


  Jim




  On Feb 12, 2008, at 6:28 PM, adriancwong at earthlink.net wrote:


    To all,

    Two of my friends from Hong Kong informed me that their 14MZ has
developed what the the Futaba Japan called a "Stick Volume" problem.  You
can be flying along without giving any input to any of the control, but
suddenly, there can be a twitch on any of the moving surfaces, as if you
give the stick a quick jerking movement. One of my friend had it to the
rudder, and the other on the aileron. They sent it back to Futaba Japan and
got it fixed, explanation from Futaba was a wear and tear problem on the
stick control.

    I've been using my 14MZ for over a year now, and I had the same thing
happen to my aileron started about a month ago. At first, I thought it was
an old ail servo, I changed both of them and flew it for another 20 flights
without any issues. Then, I switched to another plane with brand new aileron
servos a few days ago, and the same issue resurfaced, and the occurance gets
more and more frequnt.

    This morning, I was practicing the P-09 sequence with my friend Don
Atwood. As I was pulling the plane into the stall turn, it started to twitch
on the up line. I then pulled the plane into the next maneuver - top hat
with 4 of 8 - it twitched again on the down line. It never went into a
complete lock-out, but just a quick twitch on the ail.

    After I landed, I was able to duplicate the same movement on the
aileron. I moved the stick back and forth a few times, as soon as I let go
of the stick, within a split second, both aileron will twitch a few times
and then stopped.

    As far as I know, the 14MZ Tx does not have atick pots any more, it has
some kind of an encoder, similar to a - fly by wire - system on the modern
jet liners? The encoder is suppose to detect the amount of input onto the
stick and feed the signal to the servos?

    Here are my questions:-

    Am I correct on the encoding system?

    Does anyone on the list experienced the same issue?

    Does this only occur to the 14MZ,  or, other models with the similar
encoding system. Particularly with the 2048 resolution?

    When I send it to Great Planes for service, will they be able to
identify the problem easily with an electronic scope?

    Thanks in advance to all.

    Adrian
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