[NSRCA-discussion] Futaba 14MZ glitch

[Stuart Chale]

I sent my 14 in for a cracked screen.  They also had some screens that were
too insensitive so were prone to breaking from pushing too hard :-)  They
replaced that without problem but also changed the "encoders" without me
having to ask.

Stuart

 

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of JShulman
Sent: Wednesday, February 13, 2008 12:04 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Futaba 14MZ glitch

 

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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