[NSRCA-discussion] Futaba 14MZ glitch

[Tony]

Adrian:
Yes, there has been a change in the Stick pots on the 14MZ, as they found
the original ones did not hold up.  There is a conversion available to fix
this problem.  You should not have any problem with Hobbico Service fixing
it for you.  However, we can also do it here.  They may do it for free as a
warranty issue, however.

 

 

Tony Stillman, President

Radio South, Inc.

139 Altama Connector, Box 322

Brunswick, GA  31525

1-800-962-7802

www.radiosouthrc.com

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
adriancwong at earthlink.net
Sent: Tuesday, February 12, 2008 9:29 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Futaba 14MZ glitch

 

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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