[NSRCA-discussion] Futaba 14MZ glitch

[hnycmpsts at aol.com]

Hi Adrian,



Hope things are well with you.



I've experienced a similar situation with my Futaba 12 Tx, on my ailerons.



Could the cause be the same as on the 14MZ?


Regards,

Oscar


-----Original Message-----
From: adriancwong at earthlink.net
To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
Sent: Tue, 12 Feb 2008 9:28 pm
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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