[NSRCA-discussion] Un-commanded rudder sweep during flying session pre-flight checkout

[Vicente Bortone]

Hi Mike,

I haven’t use voltage regulators in many years.  I suggest that you go
straight to Rx.

Best regards,

Vicente “Vince” Bortone

On Sun, May 28, 2023 at 3:59 PM Michael Cohen via NSRCA-discussion <
nsrca-discussion at lists.nsrca.org> wrote:

> OK NSRCA list, got a weird one to run by the Pattern hive mind to see if
> anyone has any ideas.  My plane has two FlexReg PLR5 Tech-Aero Voltage
> Regulators and batteries for redundancy.  My typical flying session
> pre-flight checkout involves turning one on at a time and sweeping all
> surfaces.   Today, the rudder swept back and forth after I stopped a
> similar command from the transmitter on the first regulator I turned on.
> Maybe my leads were not fully seated???  I unplugged and re-plug both
> regulator leads at the receiver and the problem went away.  Today, when I
> got home, I decided to replace the regulator causing the issue with one
> from a backup plane and did my sweep checks.  The following was always
> performed with only one regulator plugging in at a time and without the
> wings on.....
>
>    1. With the replacement regulator (R1) plugged into channel 8, the
>    rudder kept sweeping back and forth un-commanded (after I stopped).  The
>    elevator was fine.
>    2. Moving from channel 8 to 7 (R1), the rudder kept sweeping back and
>    forth un-commanded.  The elevator was fine.
>    3. Plugging the same battery (B1) into the other regulator (R0) that
>    has always been in the plane into channel 8, both rudder and elevator we
>    fine.
>    4. Moving from channel 8 to 7 (R0), both rudder and elevator we fine.
>    5. I repeated steps 1 & 2, the rudder kept sweeping back and forth.
>    The elevator was fine.
>    6. Grabbing the OTHER regulator (R2) from the backup plane and
>    repeating steps 1-4 above yielded the same results.
>    7. I removed the regulator (R2), leaving the original (R0) and the
>    original backup (R1) in the plane
>    8. Hooking up a second battery (B2) and cycling back and forth between
>    the two regulators, once switch at a time, there we no issues.
>    9. There were also no issues with both packs on at the same time
>
> Based on the above, the problem did not follow anything in particular.
>
> B1 + R1 + 7 = *X* (rudder sweep)
> B1 + R1 + 8 = *X*
> B1 + R0 + 7 = *Y* (rudder fine)
> B1 + R0 + 8 = *Y*
> B1 + R2 + 7 = *X*
> B1 + R2 + 8 = *X*
>
> B1 + R1 + 7 OR B2 + R0 + 8 = *Y*
> B1 + R1 + 8 OR B2 + R0 + 7 = *Y*
> B1 + R1 + 8 AND B2 + R0 + 7 = *Y*
>
> Thoughts???
>
> Since this is a Futaba R7008SB receiver, I could ditch the regulators and
> just go straight into the receiver (did not try that yet).....
>
> Regards,
> Mike C
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-- 
Vicente "Vince" Bortone
*NSRCA 1140.  Be Proud to show your NSRCA #*
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